SECTION 07 54 00
THERMOPLASTIC MEMBRANE ROOFING (TPO)
** NOTE TO SPECIFIER ** Mule-Hide Products Co., Inc.; Mulehide, Roofing, Thermoplastic Membrane, TPO, Membrane Systems, Self-Adhering, Fully Adhered, Membrane, Mechanically Attached, Welding, Reinforced, Non-Reinforced, Flashings, Bonding Adhesives, TPO Cut-Edge Sealant, TPO Coated Metal, Fasteners, Discs, One-Part Pourable Sealer, All-Purpose Bar, TPO Walkway Roll, Universal Single Ply Sealant, Vapor Retarder, Wood Blocking, Insulation, Slip Sheet, Metal Flashings, Adhesives, Sealants, Walkways, Drains, Expansion Joints, Pitch Pans, Temporary Tie-Ins.
This section is based on the products of Mule-Hide Products Co., Inc., which is located at:
1195 Prince Hall Dr.
Beloit, WI 53511
Toll Free Tel: 800-786-1492
Tel: 608-365-3111
Fax: 608-365-7852
Email: request info (mulehide@mulehide.com)
Web: https://www.mulehide.com
[ Click Here ] for additional information.
Welcome to MuleHide, the name trusted in roofing since 1906.
We are commercial roofing experts who are passionate about our industry and serving the great people who work in it. We offer a complete range of premium-quality low-slope roofing products. Our distribution network - stretching from coast to coast and into Canada - ensures you have those products when and where you need them. Most importantly, we provide the technical expertise, support and training you need to complete jobs successfully. Every time.
GENERAL
SECTION INCLUDES
** NOTE TO SPECIFIER ** Fully-Adhered:
Mule-Hide Fully Adhered TPO (Thermoplastic Polyolefin) Self Adhering Membrane Roof System utilizes a 10-foot wide 60-mil (.060 inches (1.52 mm)) thick reinforced TPO sheet laminated to an elastomeric pressure- sensitive adhesive.
TPO membrane is fully adhered to substrate by removing release liner on laminated adhesive and rolling membrane in place. Adjoining sheets are overlapped a minimum of 3 inches (76.20 mm) and welded with a robotic welder. Field membrane is secured at all changes in plane greater than 2 inches (50.80 mm) per foot. Note: All membrane thicknesses listed in this specification are nominal thicknesses.
Mechanically Attached:
Mule-Hide Mechanically Attached TPO (Thermoplastic Polyolefin) Membrane Roof System utilizes a 45-mil (.045 inches (1.14 mm)), 60-mil (.060 inches (1.52 mm)) or 80-mil (.080 inches (2.03 mm)) thick reinforced TPO sheet.
TPO membrane is mechanically attached to roof deck with 2.4 inches (60.96 mm) Seam Plates and approved Mule-Hide Fasteners. Adjoining sheets are overlapped a minimum of 5-1/2 inches (139.70 mm) and welded with a robotic welder. Field membrane is secured at all changes in plane greater than 2 inches (50.80 mm) per foot. Note: All membrane thicknesses listed in this specification are nominal thicknesses.
General Design Considerations:
It is the responsibility of the design professional to review local, state and regional codes to and structural load limitations to determine their impact on the specified Roofing System.
A core cut may be taken to verify weight of existing components when roofing system is specified on an existing facility.
On new construction projects, especially in cold climate regions, moisture generated due to the construction process could adversely impact various components within the roofing assembly if not addressed. Reference to SPRI Advisory Bulletin, Construction-Generated Moisture and its Effect on Roofing Systems.
Evaluate drainage for compliance with applicable codes. Slopes may be provided by tapering structure or through use of tapered insulation. Provide enough roof drains to allow for positive drainage.
Eliminate significant ponding that could remain after 48-hours by adding auxiliary drains in low areas where ponding is anticipated.
Mule-Hide specifically disclaims responsibility for design and selection of an adequate drainage system and drain accessories. Selection must be made by the Owner and Design Professional.
Small incidental areas of ponded water will not impact the performance of this roofing system; however, in accordance with industry standards, roofing assembly to be designed to prevent ponding of water on the roof for prolonged periods (longer than 48-hours).
Good roofing practice dictates proper drainage to prevent possible excessive live load and, in the event of a roof leak, to minimize potential interior damage to roofing assembly and to interior of building.
Specify removal of existing wet insulation and membrane. Select an appropriate and compatible material as filler for voids created by removal of old insulation or membrane.
Regardless of type of membrane or assembly selected, any loose flashings at the perimeter, roof drains and roof penetrations must be removed.
Delete any sections below not relevant to this project; add others as required.
Membrane.
Insulation.
Sheet Metal Flashing and Trim.
Accessories.
RELATED SECTIONS
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
Section 03 30 00 - Cast-in-Place Concrete.
Section 05 31 00 - Steel Decking.
Section 06 10 00 - Rough Carpentry.
Section 07 01 50.19 - Preparation for Re-Roofing.
Section 07 21 00 - Thermal Insulation.
Section 07 25 00 - Weather Barriers.
Section 07 71 00 - Roof Specialties.
Section 07 72 00 - Roof Accessories.
Section 07 62 00 - Sheet Metal Flashing and Trim.
Section 07 76 00 - Roof Pavers.
Section 08 45 00 - Translucent Wall and Roof Assemblies.
Section 08 62 00 - Unit Skylights.
Section 22 10 06 - Plumbing Piping Specialties.
Section 32 93 00 - Plants.
REFERENCES
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
American Society of Civil Engineers (ASCE):
ASCE 7 - Minimum Design Loads and Associated Criteria for Buildings and Other Structures; 2022.
ASTM International (ASTM):
ASTM C518, Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus, 2021.
ASTM C578 - Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation; 2023.
ASTM D6878 - Standard Specification for Thermoplastic Polyolefin- Based Sheet Roofing; 2021.
Federal Specification:
HH-I-1972, Insulation Board, Thermal Faced, Polyurethane or Polyisocyanurate; Current Edition.
FM Global (FM):
FM (AG) - FM Approval Guide; Current Edition.
FM 1-49, Loss Prevention Data Sheet, Perimeter Flashing, 2025.
FM DS 1-28 - Wind Design; 2015, with Editorial Revision, 2024.
FM DS 1-29 - Roof Deck Securement and Above-Deck Roof Components; 2016, with Editorial Revision (2022).
National Roofing Contractors Association (NRCA):
NRCA (RM) - The NRCA Roofing Manual; 2025.
Sheet Metal and Air Conditioning Contractors National Association (SMACNA):
Architectural Sheet Metal Manual, Current Edition.
Single Ply Roofing Industry (SPRI):
SPRI Advisory Bulletin, Construction-Generated Moisture and its Effect on Roofing Systems; Current Edition.
Underwriters Laboratories (UL):
UL (DIR) - Online Certifications Directory; Current Edition.
SUBMITTALS
Submit under provisions of Section 01 30 00.
Product Data:
Manufacturer's data sheets and specifications on each product used, including but not limited to vapor retarder, insulation, slip sheet, fasteners, membrane, membrane flashings, metal flashings, adhesives, sealants, walkways, and accessory items.
Manufacturer's guide specifications.
Manufacturer's written preparation and installation instructions.
Manufacturer's written recommendations for insulation use and attachment.
Storage and handling requirements.
Samples: Two samples of each material type to be used in roofing system.
Dimensioned Shop Drawings: Include details of materials, construction, and finish. Include:
Outline of roof.
Details for flashings and terminations.
Joint or termination details and conditions.
Show relationship with adjacent construction.
Show interface with related systems and materials.
Include setting plan for insulation.
Include mechanical fastener layout.
Show paver layout.
Manufacturer's Certificate: Certify roofing products and accessories meet or exceed specified requirements.
Certification from insulation, roofing and accessory component manufacturers that materials supplied comply with identified ASTM and industry standards.
Verification that system specifications meet Code and insurance requirements, including but not limited to:
Factory Mutual Research Laboratories.
Underwriters Laboratories.
Sustainable design documentation.
Installers qualification statement.
Testing firm's qualification statement.
Pullout Tests:
Submit copy of tests.
Submit copy of manufacturer's review of tests.
Sample Warranty.
** NOTE TO SPECIFIER ** Manufacturer On-Site Warranty Inspection is only required when specifying a full-system warranty. Manufacturer On-Site Inspection is not required for Roofing Membrane Limited Warranty.
Manufacturer's On-Site Warranty Inspection Report for Full-System Warranties: Submit manufacturer's on-site inspection report detailing inspection and confirming system is installed in accordance with manufacturer's written and warranty requirements.
Warranty Application:
Prior to commencement of Work, submit Warranty Application to manufacturer's technical department for review and approval.
Complete Warranty Application and include copy of written roof specification from Contract Documents.
Include requests for deviation from manufacturer's standard written specifications and details.
Include roof drawings showing dimensions and locations of penetrations.
QUALITY ASSURANCE
Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with a minimum of 5- years documented experience.
Installer Qualifications: Manufacturer approved Independent Warranty Eligible Contractor specializing in performance of the Work of this section on projects of similar scope and complexity.
Obtain written approval from manufacturer and manufacturer's Warranty Department for deviations from manufacturer's written requirements.
** NOTE TO SPECIFIER ** Manufacturer On-Site Warranty Inspection only required when specifying a full-system warranty. Manufacturer On-Site Inspection is not required for Roofing Membrane Limited Warranty.
Manufacturer On-Site Warranty Inspection for Full-System Warranties: Require manufacturer's authorized representative to perform an on-site inspection of roof to verify installation requirements have been met. Provide inspection report.
Testing Firm Qualifications: Company specializing in performance of the testing specified and approved by manufacturer.
Source Limitations: Provide each type of product from a single manufacturing source to ensure uniformity. Alternate accessory products only as approved by roofing manufacturer.
Pullout Tests:
Conduct pullout tests to verify condition of deck or substrate and to confirm system design pullout values.
Conduct a minimum of ten pullout tests for areas up to 500 squares.
Conduct two tests per 100 squares after the initial tests.
Perform 60 percent of tests in perimeters and 40 percent of tests from field areas.
Perform additional tests in areas where integrity of deck is questionable.
Submit written report of test results to manufacturer's Warranty Department for review.
Submit copy of reports and manufacturer's review of report to Architect.
Do not install mechanically attached systems over Oriented Strand Board (OSB) without prior written approval from the manufacturer.
Coordinate with installation of associated Work installed under other sections.
PRE-INSTALLATION CONFERENCE
Conduct pre-installation conference a minimum of 1-week prior to scheduled commencement of the Work.
Attendees to include Architect, Contractor and trades related to roofing system Work.
Agenda to include, but not limited to:
Schedule.
Responsibilities.
Preparation.
Installation procedures.
Interface with related construction.
Coordination of related work.
DELIVERY, STORAGE, AND HANDLING
Deliver materials in manufacturer's original unopened containers or wrappings, clearly labeled with manufacturer's name, product identification, and date of manufacture.
Store and handle in strict compliance with manufacturer's written instructions and recommendations.
Protection:
Protect materials from damage during transit, storage, and delivery to site. Place materials on pallets and protect from moisture.
Protect from damage due to weather, excessive temperatures, and construction operations.
Protect insulation in accordance with manufacturer's written instructions.
Storage:
Store materials in dry, clean area, clear of ground and moisture, and protected from weather.
Store rolls of membrane flat on pallets.
Store adhesive, caulking, and self-adhering TPO membrane at temperatures between 60 Degrees F and 80 Degrees F.
Store flammable materials in accordance with the Authorities Having Jurisdiction.
Ensure storage of materials does not exceed static and dynamic load-bearing capacities of roof decking.
Replace materials damaged due to improper storage with new materials.
PROJECT CONDITIONS
Maintain environmental conditions within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside of manufacturer's recommended limits.
Contact manufacturer's Warranty Department for additional requirements if any of the following conditions exist:
Specified wind speed warranty greater than 55 MPH.
Building height greater than 50 feet (15.2 m).
Project located in coastal or high wind zones.
Pressurized buildings.
Cold Storage or Freezer Buildings.
Membrane exposed to chemicals.
Installation on OSB roof deck.
If Roof System should exceeds the structural load conditions as determined by an Architect or Engineer.
If chemical or hazardous materials are discharged onto Roof System.
Install only as much roofing as can be made watertight by end of work day. This includes flashing work.
WARRANTY
** NOTE TO SPECIFIER ** Roofing Membrane Limited Warranty for Commercial Projects.
The Roofing Membrane Limited Warranty ("Warranty") covers only the Mule-Hide TPO membrane (or portion thereof) determined by Mule-Hide to be defective and resulting in roof leaks. This Warranty does not cover workmanship or other components not supplied by Mule-Hide. Mule-Hide does not perform inspections of the installation before issuing the Roofing Membrane Limited Warranty. A Mule-Hide Warranty Application and the appropriate fee must be submitted to Mule-Hide to obtain this warranty. Proof of purchase may be required.
Standard System Warranty.
The Standard warranty is an NDL ("No Dollar Limit"), labor and material warranty that covers only the Mule-Hide labeled membrane and accessories that comprise the Mule-Hide Roof System, other components supplied or approved in writing by Mule-Hide and exclusively installed by an independent Mule-Hide Warranty Eligible Contractor. Applicator must submit a Warranty Application and the appropriate fee to Mule-Hide. Standard warranties require inspections by a Mule-Hide representative.
Premium System Warranty.
The Premium warranty is an NDL ("No Dollar Limit"), labor and material warranty that covers only the Mule-Hide labeled membrane, insulation and accessories or components supplied or approved in writing by Mule-Hide and exclusively installed by an independent Mule-Hide Warranty Eligible Contractor.
Applicator must submit a Warranty Application and the appropriate fee to Mule-Hide. Premium warranties require inspections by a Mule-Hide representative.
Term limits from 10-, 15-, 20-years.
Extended wind speed and hail coverage available.
To ensure compliance with Mule-Hide's warranty requirements, contact Mule-Hide Warranty Department if any of the following conditions exist.
Specified wind speed warranty greater than 55 MPH.
Building height > 50 feet (15.2 m).
Projects located in coastal or high wind zones.
Pressurized buildings.
Cold Storage or Freezer Buildings.
Membrane exposed to chemicals.
OSB roof deck.
** NOTE TO SPECIFIER ** Consult Manufacturer's Warranty Information here: https://www.mulehide.com/Search?q=Warranty to determine appropriate warranty for your project.
Manufacturer's ____-year Roofing Membrane Limited Warranty for Commercial Projects.
Manufacturer's ____-year Standard System Warranty.
Manufacturer's ____-year Premium System Warranty.
PRODUCTS
MANUFACTURERS
Acceptable Manufacturer: Mule-Hide Products Co., Inc., which is located at:
1195 Prince Hall Dr.
Beloit, WI 53511
Toll Free Tel: 800-786-1492
Tel: 608-365-3111
Fax: 608-365-7852
Email: request info (mulehide@mulehide.com);Web: https://www.mulehide.com
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
Substitutions: Not permitted.
Requests for substitutions will be considered in accordance with the provisions of Section 01 60 00.
** NOTE TO SPECIFIER ** Delete article if not required.
PERFORMANCE AND DESIGN REQUIREMENTS
Solar Reflectance Index (SRI): ____.
Roof-Ceiling Fire Resistance Rating: Comply with UL (DIR), Assembly Design No. ___.
Roof Covering External Fire Resistance Classification: Class ____ when tested in accordance with ____.
Wind Uplift: In accordance with ASCE 7 and the Authorities Having Jurisdiction.
Factory Mutual Classification: ___.
Insulation Thermal Resistance (R-Value): Provide R-Value over entire roof deck in accordance with the Authorities Having Jurisdiction.
R-Value: ____.
Drainage: No standing water within ____-hours after precipitation.
MEMBRANE
** NOTE TO SPECIFIER ** Mule-Hide Reinforced TPO Self Adhering membrane is available in 10-foot wide rolls and 60 mils (.060 inches (1.52 mm)) thick.
The Mule-Hide TPO Self Adhering membrane is a polyester scrim reinforced thermoplastic polyolefin roofing membrane that meets and exceeds the requirements of ASTM D6878 Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing laminated to an elastomeric pressure-sensitive adhesive.
Mule-Hide Reinforced TPO-c Membrane is available in 45 mils (.045 inches (1.14 mm)), 60 mils (.060 inches (1.52 mm)), or 80 mils (.080 inches (2.03 mm)) thick. TPO-c membrane is a polyester scrim reinforced thermoplastic polyolefin roofing membrane that meets and exceeds the requirements of ASTM D6878 Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing.
Reference Product Data Sheets for physical properties and additional information.
Membrane: Polyester scrim reinforced thermoplastic polyolefin roofing membrane, ASTM D6878.
Self-Adhering:
Basis-of-Design: Mule-Hide TPO Self Adhering Membrane; www.mulehide.com.
Thickness: 60-mil (0.060 inches (1.52 mm)).
Mechanically Attached:
Basis-of-Design: Mule-Hide Reinforced TPO-c Membrane; www.mulehide.com.
Thickness:
45-mil (0.045 inches (1.14 mm)).
60-mil (0.060 inches (1.52 mm)).
80-mil (0.080 inches (2.03 mm)).
** NOTE TO SPECIFIER ** Delete articles not required.
Premium Warranties require the use of manufacturer labeled insulation or insulation approved by manufacturer. If you are specifying a premium warranty, contact the manufacturer's technical department for specific requirements.
If project is subject to compliance with UL for FM requirements, components may change with slope, deck type, and classification requested. Contact manufacturer's technical department for guidance.
UL and FM Approved Assemblies: Contact Mule-Hide Technical Department for proper insulated assemblies when projects require compliance with UL or FM requirements. The components may change with the slope, deck type and classification requested.
INSULATION
See Section 07 21 00, Thermal Insulation.
Protection layer over existing substrate to obtain desired thermal Value.
Compatible with manufacturer's membranes, adhesives, flashings, and accessories and approved by manufacturer in writing.
** NOTE TO SPECIFIER ** Premium warranties require use of manufacturer labeled insulation or insulation by an approved manufacturer. If a premium warranty is specified, contact manufacturer's technical department for specific requirements.
Acceptable Insulation Boards:
Polyisocyanurate:
With non-asphaltic facers. Foil facers are not acceptable.
Meeting physical property requirements of Fed. Spec HH-I-1972.
Compressive Resistance: 18 psi.
Thickness: Minimum 1 inch (25.40 mm) or greater as required by insulation manufacturer to span steel deck flutes.
High Density Polyisocyanurate:
Closed-cell polyisocyanurate foam core laminated to premium performance coated glass fiber felt facers.
Type:
Flat.
Tapered.
Thickness: 1/2 inches (12.70 mm).
100 psi.
Basis-of-Design: Poly ISO 1-HD; www.mulehide.com.
** NOTE TO SPECIFIER ** Minimum thicknesses may vary with wind requirements and deck types. Consult manufacturer.
High Density Wood Fiberboard:
Used as overlay over other insulations.
Thickness:
Used as an Overlay: Minimum 1/2 inches (12.70 mm).
Over Steel Decks: Minimum 1 inch (25.40 mm).
Over Wood or Concrete Deck: Minimum 1/2 inches (12.70 mm).
Expanded Polystyrene (EPS).
Board Density: 1.0 PCF certified minimum meeting ASTM C578.
Type: II.
Thickness:
Minimum 1 inch (25.40 mm).
Over Steel Deck: As required by insulation manufacturer to span flutes.
** NOTE TO SPECIFIER ** Consult building Code to ensure whether a layer of gypsum board is required under EPS insulation on steel decks. If required, add it here.
Required Overlay:
Minimum 1/2 inches (12.70 mm) High Density Wood Fiberboard.
Minimum 1 inch (25.40 mm) polyisocyanurate insulation.
Minimum 1/4 inches (6.35 mm) DensDeck; www.buildgp.com.
Minimum 1/4 inches (6.35 mm) Securock; www.usg.com.
Extruded Polystyrene (XPS):
Meeting ASTM C578.
Type:
IV.
VI.
VII.
Thickness:
Minimum 1 inch (25.40 mm).
Over Steel Deck: As required by insulation manufacturer to span flutes.
** NOTE TO SPECIFIER ** Consult building Code to ensure whether a layer of gypsum board is required under EPS insulation on steel decks. If required, add it here.
Required Overlay:
Minimum 1/2 inches (12.70 mm) High Density Wood Fiberboard.
Minimum 1 inch (25.40 mm) polyisocyanurate insulation.
Minimum 1/4 inches (6.35 mm) DensDeck; www.buildgp.com.
Minimum 1/4 inches (6.35 mm) Securock; www.usg.com.
** NOTE TO SPECIFIER ** Perlite may only be used as fill insulation under an approved insulation. TPO Membrane cannot be adhered directly to Perlite insulation.
Perlite:
Perlite is not permitted as top layer insulation.
Approved Overlay:
Minimum 1/4 inches (6.35 mm) thick layer may be used as an overlay over approved insulation or as thermal barrier over a combustible deck.
Minimum 1/4 inches (6.35 mm) DensDeck; www.buildgp.com.
Minimum 1/4 inches (6.35 mm) DensDeck Prime; www.buildgp.com.
Minimum 1/4 inches (6.35 mm) Securock; www.usg.com.
Comply with manufacturer's written recommendations for use and attachment.
** NOTE TO SPECIFIER ** Metal flashing products supplied by Mule-Hide (Mule-Hide Metal Accessories) and installed by a Mule-Hide Warranty Eligible Contractor will be covered under a Standard or Premium System Warranty.
Sheet metal components supplied by others are not covered by the Mule-Hide warranties.
SHEET METAL FLASHING AND TRIM
See Section 07 62 00, Sheet Metal Flashing and Trim.
Fabricate and install TPO Coated Metal and non-coated metal components including, but not limited to gravel stops, drip aprons, counterflashings, and copings in accordance with ES-1 recommendations and requirements.
Fabricate and install metal components in accordance with ES-1 recommendations and requirements.
ACCESSORlES
Adhesives:
Helix Max Low Rise Adhesive: Two-component, low rise, construction grade, polyurethane foam adhesive; www.mulehide.com.
TPO Bonding Adhesive: Solvent Based rubberized adhesive; www.mulehide.com.
Used for flashings only and not to adhere to Membrane.
Low-VOC Bonding Adhesive; www.mulehide.com.
High strength solvent-based contact adhesive for bonding of TPO membrane to various porous and non-porous substrates.
VOC Content: Less than 250 gpl.
Used for flashings only and not to adhere to Membrane.
Low-VOC Bonding Adhesive 1168; www.mulehide.com.
High strength solvent-based contact adhesive for bonding of TPO membrane to various porous and non-porous substrates.
VOC Content: Less than 250 gpl.
Used for flashings only and not to adhere to Membrane.
AeroWeb Low-VOC Aerosol Contact Adhesive/Primer; www.mulehide.com.
Low VOC contact adhesive used to adhere TPO membrane to various substates and prime surfaces prior to application of F5 Air and Vapor Barrier.
Aqua Base 120 Bonding Adhesive; www.mulehide.com.
Semi pressure-sensitive water-based bonding adhesive for use with manufacturer's TPO membranes to various vertical substrates and insulation boards.
Applied as a two-sided contact adhesive when used with standard non-fleece back TPO Members.
Applied on a single-side, wet lay-in adhesive when used with fleece back TPO membrane.
Used for flashings only and not to adhere to Membrane.
Tape and Primers:
TPO Primer; www.mulehide.com.
High-solids-content, clear, polymer-based splice primer used to prepare TPO membrane for improved adhesion to pressure-sensitive TPO accessories including, but not limited to RUSS Strips, TPO Pressure Sensitive Cover Strips, Uncured Flashing Tapes, and Cured Cover Tapes.
TPO Primer is required prior to application of pressure sensitive Mule-Hide accessories.
Low VOC Primer; www.mulehide.com.
Solvent-based product to prepare TPO membrane for improved adhesion to pressure-sensitive TPO accessories including, but not limited to, RUSS Strips, TPO Pressure Sensitive Cover Strips, Uncured Flashing Tapes, and Cured Cover Tapes.
TPO Flashing; www.mulehide.com.
Non-reinforced material to seal details where field fabrication is necessary including, but not limited to, drain details, pipe flashings, pitch pocket flashings, and seaming joints of TPO Coated Metal, or where reinforced membrane is not practical.
Thickness: 0.060 inches (1.52 mm).
TPO Universal Corners; www.mulehide.com.
Pre-molded, non-reinforced TPO material for water tightness at corners formed by TPO Coated Metal and flashing membrane.
Thickness: 0.060 inches (1.52 mm).
Color: White.
TPO Outside Corners; www.mulehide.com.
Pre-molded for flashing outside corners.
Color:
White.
Gray.
Tan.
TPO Inside Corners:
Pre-molded for flashing inside corners.
Color:
White.
Gray.
Tan.
Weathered Membrane Cleaner; www.mulehide.com.
To clean aged TPO membrane prior to welding process.
Cleaner leaves a suitable surface for application of TPO Primer.
TPO Pipe Seal; www.mulehide.com.
Injection molded, pre-formed flashing for pipes.
Non-reinforced TPO material.
** NOTE TO SPECIFIER ** TPO Joint Covers are mandatory for 60-mil and 80-mil TPO Systems and all systems with warranties longer than 15-years.
TPO Joint Cover:
Non-reinforced flashing for sealing step-offs at splice intersections.
60-mil thick cut into 4-1/2 inches (114.30 mm) diameter circles.
TPO T-Joint Cover; www.mulehide.com.
Non-reinforced flashing for sealing step-offs at splice intersections.
60-mil thick cut into 4-1/2 inches (114.30 mm) diameter circles.
TPO Coated Metal:
** NOTE TO SPECIFIER ** 24-gauge, galvanized steel laminated with 35-mil (.035 inches (0.89 mm) D) non-reinforced TPO Membrane for flashing an d edge metal detailing.
All-Purpose Bar (A-P Bar); www.mulehide.com.
Extruded aluminum bar:
Thickness: 50 mils (0.050 inches (1.27 mm)) thick.
To terminate adhered reinforced membrane vertical flashings in certain conditions.
May be used to anchor field sheet at base of vertical angle changes.
Membrane Fasteners and Plates; www.mulehide.com.
As supplied and approved by manufacturer for specific job conditions and substrates.
Induction Weld Plates:
For attachment of insulation or coverboards to deck while providing non-mechanical attachment of TPO single-ply membranes using an induction weld bond to the Induction Weld Plate.
For use on heat welded membranes with steel, wood, or structural concrete decks.
Size: 3-3/8 inches (85.72 mm) diameter.
Fasteners:
#15 EHD, Tru-Spike Fasteners.
PFC Purlin Drill Point Fasteners.
Thermoplastic One-Part Pourable Sealer; www.mulehide.com.
One-component thermoplastic sealant for pitch pockets.
TPO 45-mil Reinforced Flashing Strips; www.mulehide.com.
Cover strips over end lap joints of fleece back membrane.
For stripping-in TPO coated metal, rows of plates and fasteners, or A-P Bar.
TPO Cut Edge Sealant; www.mulehide.com.
Solvent-based liquid sealant to seal cut edge of membrane.
TPO Walkway Rolls:
Thickness: 1/8 inches (3.17 mm).
Embossed TPO Membrane with herringbone traction surface and timed in safety yellow.
Welded directly to TPO roofing membrane.
Color:
White.
Gray.
Protective Mat; www.mulehide.com.
UV resistant polypropylene needle punched fabric.
Used above membrane as slipsheet for protection from damage.
** NOTE TO SPECIFIER ** Mule-Hide does not require a vapor retarder for protection of membrane; however it should be considered by the specifier for the protection of the roofing assembly (i.e. primarily insulation, underlayment and adhesives). The following criteria should be considered by the specifier:
Use of a vapor retarder to protect insulation and reduce moisture accumulation within an insulated roofing assembly, should be investigated by the specifier. Consult latest publications by ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.), NRCA (National Roofing Contractors Association), local building and energy codes for specific information.
In the generally temperate climate of the United States, during the winter months, water vapor flows upward from a heated, more humid interior toward a colder, drier exterior. Vapor retarders are more commonly required in northern climates than in southern regions, where downward vapor pressure may be expected and the roofing membrane itself becomes the vapor retarder.
On cold storage/freezer facilities, the perimeter and penetration details must be selected to provide an air seal and prevent outside air from infiltrating and condensing within the roofing assembly.
When a vapor retarder is specified, Mule-Hide F5 Air & Vapor Barrier may be used. Refer to the F5 Air & Vapor Barrier Product Data Sheet for product installation.
On structural concrete decks, when a vapor retarder is not used, gaps in the deck along the perimeter and around penetrations must be sealed. If tilt-up panels are present, vertical joints between panels must be sealed as well. Sealing these areas will help prevent infiltration of hot humid air and possible moisture contamination resulting from condensation. This is specifically important when adhesive is used to attach the roof insulation.
Vapor Retarder:
Thickness: 40 mils.
Composite consisting of 35 mil self-adhering rubberized asphalt membrane laminated to 5 mil UV resistant poly film with anti-skid surface.
Compatible with Max Adhesive.
White poly film for summer exposure.
Black poly film for winter exposure.
Air and vapor barrier may function as a temporary roof for up to 120-days.
Product:
F5 Air and Vapor Barrier; www.mulehide.com.
Other Vapor Retarders:
Provide vapor retarders be compatible with insulation and other accessories and approved by Architect.
Wood Nailers:
#2 or better lumber.
Do not use creosote and asphaltic preservatives.
Pressure treated lumber is not required on new construction unless specified by the Architect.
Conform to Factory Mutual's Loss Prevention Data Sheet 1-49.
Provide nailers of a height sufficient to match thickness of insulation.
EXECUTION
GENERAL
Comply with manufacturer's written installation instructions for materials, components and accessories and install in accordance with warranty requirements, approved submittals, NRCA (RM) applicable requirements, and in proper relationship with adjacent construction.
Prior to and during installation, remove dirt, debris, and dust from surfaces to be roofed for both new and reroofing substrates.
Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's recommended limits.
Do not install materials until substrates and surfaces are properly prepared, clean, and thoroughly dry in accordance with manufacturer's written instructions. Should surface moisture occur, provide adequate equipment to dry substrate prior to application of new material.
Do not expose materials vulnerable to water or sun damage in quantities greater than can be installed and weatherproofed in the same day.
Perform test cuts at each roof area prior to re-roofing.
Schedule the Work so new roofing is installed and made watertight in the same day, including flashings.
Leave no partially completed Work exposed at the end of the workday.
Take precautions to prevent wind blow-off or wind damage during the Work.
Provide securement of temporary constructions, materials, and equipment.
Verify roof drain lines are unblocked before commencement of Work. Report blockages the Architect and manufacturer's technical department in writing.
Install temporary waterstops at the end of each day's work. Remove temporary waterstops at the start of the next day's work and dispose. Provide material compatible waterstops.
Do not install membrane in direct contact with products containing coal tar pitch, creosote or penta-based materials. Consult manufacturer for special installation requirements.
Comply with safety regulations of the Authorities Having Jurisdiction.
Do not use oil-based paint on TPO Coated Metal or membrane. Contact manufacturer's Technical Department for recommendations.
Do not allow muriatic acid masonry cleaner to come in direct contact with TPO Membrane or accessory products.
Do not allow Mule-Hide TPO membranes or accessories to come into direct contact with steam or vents that produce temperatures in excess of 160 Degrees F (71 Degrees C).
TPO Roof System may be installed in cold weather provided adhesives are stored at room temperature until just prior to use and used within 2-hours. Adhesives exposed to cold must be returned to room temperature prior to use.
Cover tapes may lose tack when exposed to temperatures below 40 Degrees F for extended periods of time. A heat gun may be used to warm product. Only apply heat to TPO side and do not overheat. Hot boxes are the preferred method for warming tapes.
In colder temperatures when the ambient temperature is near the dew point, condensation may form on tape primer and adhesive as solvents flash off. If condensation occurs, discontinue application and allow surface to dry. Do not attempt to dry surface with heat guns or torches. When weather permits apply a new coat of product.
When installing a Mechanically Attached Reinforced TPO Membrane Roofing System in cooler weather, liquids such as solvents and sealant to be stored at temperatures between 60 Degrees F to 80 Degrees F until immediately prior to use.
Execute the Work without exposing interior building areas to the effects of inclement weather. Protect existing building against risks.
Sequence Work to avoid use of newly constructed roofing for storage, walking surfaces, and equipment movement.
Provide necessary protection and barriers to segregate work areas and prevent damage to adjacent areas.
If excessive traffic over newly installed membrane is necessary, provide plywood or polyester felt protection to prevent damage.
Replace damaged materials with new materials.
Report unusual or concealed conditions discovered during the Work immediately in writing to the Architect and manufacturer's technical department. Halt Work until receipt of direction from Architect.
Existing roofing materials removed during tear off to be immediately removed from the construction site to approved dumping area.
Coordinate work between trades to avoid traffic over completed sections of roofing.
Contact manufacturer for additional specifications if the following project conditions exist:
Roof heights greater than 100 feet (30.5 m).
Geographical location in a 100 mph or greater wind zone, in accordance with ANSI 100-year mean recurrence interval wind isotach.
Location with Exposure D as determined by ASCE 7.
Review manufacturer's written instructions, precautions, and warnings prior to using heat-welding equipment.
Do not permit voids greater than 1/4 inches (6.35 mm) wide in substrate.
Concrete substrates to be cured and free of laitance and curing compounds.
EXAMINATION
Do not begin installation until the substrates have been properly constructed and prepared.
Verify deck is structurally sound, supported, and secure to provide proper securement for mechanical fasteners.
Verify deck is clean and smooth, flat, free of depressions, waves or projections, properly sloped, and suitable for installation of roof system.
Verify deck surfaces are dry and free of snow or ice.
Verify openings, curbs, and penetrations are solidly set and cant strips, nailing strips, and reglets are properly placed.
Consult manufacturer when substrate is exposed to excessively high humidity or a corrosive environment. Special stainless steel fasteners or details may be required in these environments.
For Recover Work:
Verify there is no coal tar pitch in existing roofing assembly. Presence of coal tar pitch requires use of a suitable slipsheet under insulation unless coal tar pitch is older than 10-years and separated from TPO membrane by layer of insulation no less than 1-1/2 inches (38.10 mm) thick and a minimum R-Value of 5.0.
Joints must be butted together or completely taped to prevent volatiles from damaging the roof membrane.
** NOTE TO SPECIFIER ** Fully-Adhered:
It is acceptable to install a Fully Adhered Mule-Hide TPO Self-Adhering Membrane Roofing System over the following decks as needed:
Structural Metal Deck (22-gauge minimum) to conform to recommendations outlined in Factory Mutual's Loss Prevention Data Sheet 1-28 (requires insulation). Contact Mule-Hide's Warranty Department for attachment requirements for decks less than 22-gauge in thickness. FM testing is based on attachment to a 22-gauge steel deck.
Structural concrete and pre-cast, pre-stressed concrete (2,500 psi minimum) to be cured and dry to industry standards and surface to be smooth and free of moisture or frost. Sharp ridges or other projections above the surface to be removed before roofing. An approved insulation board is recommended. Minimum deck thickness to be 2 inches (50.80 mm) with 3 inches (76.20 mm) preferred due to possible spalling damage that may occur to the underside of the deck when using fasteners for insulation and membrane attachment. Insulation may be attached with Type III or IV hot asphalt, approved adhesive or approved fasteners. The membrane may be adhered directly to structural concrete decks that have been trowel finished and are completely cured (28 day minimum). Gaps in the deck along the perimeter and around penetrations must be sealed along with vertical joints between tilt-up panels, if present, to prevent infiltration of hot humid air and possible moisture contamination resulting from condensation.
Lightweight Insulating Concrete Fill and Metal Form Work (minimum 24-gauge) - the roof deck to be cured and dry to the deck manufacturer's and/or industry standards and to be smooth and free of ridges and depressions. Necessary venting as recommended by the roof deck manufacturer to be accomplished. These decks may be acceptable to receive a Fully Adhered Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate fasteners have been selected. Attachment must be through the insulating concrete into the steel or concrete deck. Insulation board is required. Vapor barriers may be required when installing insulation over new decks.
Wood Plank (1 inches (25.40 mm) minimum) to conform to Factory Mutual's requirements for Class 1 impregnated decks (insulation is required). FM approved wood decks are a minimum, nominal 2 inches (50.80 mm) thick, tongue and groove planks.
Plywood (15/32 inches (11.91 mm) minimum) to be exterior grade (minimum CDX grade). A layer of an approved insulation is required for reroof applications. On new construction, while insulation board is recommended, adhering directly to the plywood or Oriented Strand Board ("OSB") deck is acceptable if the decking is secured with screws or back-out resistant fasteners. Decks attached with common or cement coated nails or staples to be covered with an approved insulation. Check with local building code requirements as adhering an TPO membrane direct to a wood deck may not meet local fire codes.
Cementitious Wood Fiber Decks - Certain cementitious wood fiber decks may be acceptable to receive a Fully Adhered Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate fasteners have been selected. This deck type requires an acceptable insulation.
Gypsum Deck - To be cured and dry to manufacturers' and/or industry standards. The surface of the deck to be smooth and free from ridges and depressions. Certain gypsum concrete decks may be acceptable to receive a Fully Adhered Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate attachment methods have been selected. This deck type typically requires an acceptable insulation.
Oriented Strand Board (OSB) to be a minimum 7/16 inches (11.11 mm) thick. Contact Mule-Hide for acceptable sheet sizes, fastener types and spacing when using OSB as requirements will change with thickness used. Minimum thickness or usage restrictions may change depending on local code requirements. Pullout tests must be performed and submitted to Mule-Hide Technical Department prior to bidding the project.
** NOTE TO SPECIFIER ** Mechanically Attached:
It is acceptable to install a Mechanically Attached Mule-Hide TPO Membrane Roofing System over the following deck substrates in new construction, provided that an acceptable insulation is installed over the substrate as needed:
Structural Metal Deck (22 gauge minimum) to conform to recommendations outlined in Factory Mutual's Loss Prevention Data Sheet 1-28 (requires insulation). Contact Mule-Hide's Warranty Department for attachment requirements for decks less than 22-gauge in thickness. FM testing is based on attachment to a 22- gauge steel deck.
Structural concrete and pre-cast, pre-stressed concrete (2,500 psi. minimum) to be cured and dry to industry standards and surface to be smooth and free of moisture or frost. Sharp ridges or other projections above the surface to be removed before roofing. An approved insulation board is recommended. Minimum deck thickness to be 2 inches (50.80 mm) with 3 inches (76.20 mm) preferred due to possible spalling damage that may occur to the underside of the deck when using fasteners for insulation and membrane attachment. Insulation may be attached with Type III or IV hot asphalt, approved adhesive or approved fasteners.
Lightweight Insulating Concrete Fill and Metal Form work (minimum 24 gauge metal form work) - the roof deck to be cured and dry to the deck manufacturer's and/or industry standards and to be smooth and free of ridges and depressions. Necessary venting as recommended by the roof deck manufacturer to be accomplished. These decks may be acceptable to receive a Mechanically Attached Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate fasteners have been selected. Attachment must be through the insulating concrete into the steel or concrete deck. Insulation board is required. Vapor barriers may be required when installing insulation over new decks.
Wood Plank (1 inches (25.40 mm) minimum) to conform to Factory Mutual's requirements for Class 1 impregnated decks (insulation is required). FM approved wood decks are a minimum, nominal 2 inches (50.80 mm) thick, tongue and groove planks.
Plywood (15/32 inches (11.91 mm) minimum) to be exterior grade (minimum CDX grade). A layer of an approved insulation is required for reroof applications. On new construction, while insulation board is recommended, fastening directly to the plywood deck is acceptable if the decking is secured with screws or back-out resistant fasteners. Decks attached with common or cement coated nails or staples to be covered with an approved insulation.
Mechanically attached systems are not allowed over Oriented Strand Board (OSB) decks without prior approval by the Mule-Hide Technical Department. Mule-Hide will not issue system warranties on "As-Built" projects where Mule-Hide did not grant approval prior to the start of the work.
Cementitious Wood Fiber Decks - Certain cementitious wood fiber decks may be acceptable to receive a Mechanically Attached Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate fasteners have been selected. This deck type requires an acceptable insulation.
Gypsum Concrete Deck - to be cured and dry to manufacturers' and/or industry standards. The surface of the deck to be smooth and free from ridges and depressions. Certain gypsum concrete decks may be acceptable to receive a Mechanically Attached Mule-Hide TPO Membrane Roofing System after pullout tests have been completed and appropriate fasteners have been selected. This deck type requires an acceptable insulation.
** NOTE TO SPECIFIER ** See the manufacturer's Substrate Compatibility Table.
For reroofing projects having plywood decks, a minimum of one layer of an approved insulation is required after the tear-off has been completed.
Mule-Hide recommends that roof surfaces have a positive slope to provide adequate drainage. There should not be any ponding water 48 hours after rainfall.
PREPARATION OF EXISTING SUBSTRATE - GENERAL
Prepare surfaces using methods recommended by manufacturer's written instructions for substrate under specific project conditions.
If substrate preparation is the responsibility of another installer, notify Architect in writing of unsatisfactory preparation prior to commencement of work.
Clean surfaces thoroughly prior to installation.
Inspect substrates and correct defects prior to application of roofing membrane.
For Existing Roof:
Remove wet or damaged materials and replace with new.
Remove existing phenolic insulation and sprayed in place urethane roofs.
Areas with deteriorated decking, wet insulation, or other failed materials to be removed and replaced.
Concrete substrates to be cured, free of laitance, and free of curing compounds.
Substrates and flashing substrates to receive new insulation, membrane or flashing to be thoroughly dry and free of oil, dirt, grease, sharp edges and debris.
Ensure decking is securely fastened.
Do not permit voids greater than 1/4 inches (6.35 mm) wide in substrate.
Cut and patch large blisters to provide level substrate surface.
On recover projects, tear off existing base flashings, cant strips, and projection flashings down to substrate.
Remove gravel over existing nailers prior to installation of new nailers and flashings.
Verify existing nailers are in good condition and securely anchored to the decks.
When additional thickness of insulation is added, add new nailers to match height of new insulation. Securely anchor nailers to roof deck in accordance with the requirements of this Specification.
Roof surfaces to be free of ponded water, ice, or snow. Eliminate ponding that remains after a period of 48-hours by installing tapered insulation to create positive drainage of the roof surface or by installing new drains in low areas where ponding remains. Positive drainage to eliminate possibility of excessive live loads caused by ponding water that could cause structural damage or failure.
When removing existing roof during reroofing, remove only the amount of roofing and flashing that can be made watertight with new materials by end of work day or prior to the onset of inclement weather.
Recovering over a gravel surfaced built-up roof system requires installation of an acceptable insulation. Remove loose gravel prior to mechanically attaching a new layer of insulation. Remove lead pipe and drain flashings.
Recovering over a smooth surfaced built-up roof and smooth modified bitumen roof system requires installation of acceptable insulation. Remove lead pipe and drain flashings.
Single-ply membranes such as EPDM, Hypalon, PVC or CPA to have existing flashings removed, field sheet cut into sections no larger than 10 x 10 feet (3 x 3 m), and a mechanically attached layer of insulation over existing field membrane.
Polyurethane foam roofing systems (PUF) are not acceptable for recover applications. PUF system must be completely removed and new insulation installed prior to installation of the new TPO Roofing System.
If Premium System Warranty is Requested:
Existing roof system must be removed to the deck prior to installation of new roofing system or require completion of a moisture survey by an independent third party.
Remove wet areas.
Submit copy of survey to manufacturer with warranty application.
Premium System Warranty does not cover existing roof systems or problems created by existing roof systems.
** NOTE TO SPECIFIER ** Specific climatic and job conditions may require the use of a vapor retarder.
It is the sole responsibility of the design professional to determine the need for a vapor retarder (which may be required by local building or energy codes) and its type and location in the roofing system.
A vapor retarder may often act as an "air barrier" which may have a positive effect in reducing internal air pressure. Vapor retarders should be strongly considered for buildings subject to high internal air pressures such as airplane hangars and buildings with many loading bays such as warehouse facilities.
The National Roofing Contractors Association recommends the installation of vapor retarders when interior relative humidity is 45 percent or greater and the outside mean average January temperature is below 40 degrees F.
In reroofing where existing built-up roof is to remain, built-up roof may be an adequate vapor retarder provided splits or tears are repaired to provide a total barrier to vapor penetration.
Projects utilizing Mule-Hide's F5 Air & Vapor Barrier must follow Mule-Hide's installation instructions and details for the F5 Air & Vapor Barrier.
SELF-ADHERED MEMBRANE INSTALLATION
Unroll and allow membrane to relax a minimum of 15-minutes when temperature is above 60 Degrees F, or 30-minutes when temperature is below 60 Degrees F, prior to installation.
Inspect and remove damaged membrane.
Membrane to run perpendicular to direction of steel deck flutes and orientation of wood decks where possible.
Install membrane overlaps to facilitate flow of water.
Seams: Shingled or run parallel to flow of water. Backwater seams are not permitted.
** NOTE TO SPECIFIER ** Mule-Hide Self Adhering TPO membranes have a 3 inches (76.20 mm) adhesive free selvage edge along one edge of the membrane. Lap sheets a minimum of 3 inches (76.20 mm) of adhesive free seam to provide space for a continuous, minimum 2 inches (50.80 mm) Weld. Welded field seams to be a minimum of 2 inches (50.80 mm) W. End laps to be butted and stripped in with TPO-c Reinforced Membrane, see Detail MHT-FA-104E.
Welded Field Seams: Minimum 2 inches (50.80 mm) wide.
End Laps: Butted and stripped-in with reinforced membrane.
Inspect welded seams for continuity and integrity using a cotter pin puller or other suitable blunt object.
Test Seams:
Provide sample test seams each day prior to welding field seams.
Using scrap material, run at least two test seams, each a minimum of 2 feet (0.6 m) long.
Use each test seam to determine adequate seam strength and to ensure equipment has warmed up, is operating properly, and proper settings have been determined.
Conduct test seams each time equipment is turned on after a cool down period.
Perimeter:
When installing Fully Adhered TPO Self Adhering Roofing Membrane System, it is not necessary to install half sheets parallel with the perimeter. Install full size sheets to minimize number of field seams.
In place of half sheets, install additional fasteners in insulation in the perimeter areas as defined in Perimeter Enhancements.
Weld laps for seams and end laps continuously with a minimum weld width of 2 inches (50.80 mm).
Complete field welds with an automatic welder.
Determine perimeter areas using one of the following methods:
Manufacturer's Technical Bulletin addressing Standard Fastening Patterns and Guidelines.
Minimum Perimeter Area: 8 feet (2.4 m) in from roof edge along exterior roof edges.
For Factory Mutual insured buildings, follow guidelines in FM's Loss Prevention Data Sheet 1-29. Contact manufacturer's warranty department for fastener spacing in compliance with FM 1-60 and 1-90 requirements.
MECHANICALLY ATTACHED MEMBRANE INSTALLATION
Unroll TPO Membrane and position without stretching.
Allow membrane to relax a minimum of 15-minutes when temperature is above 60 Degrees F, or 30-minutes when temperature is below 60 Degrees F, prior to installation.
Inspect and remove damaged membrane.
Membrane to run perpendicular to direction of steel deck flutes and orientation of wood decks where possible.
Install membrane overlaps to facilitate flow of water.
Seams: Shingled or run parallel to flow of water. Backwater seams are not permitted.
Lap sheets a minimum of 5-1/2 inches (139.70 mm) for In-Lap Fastening, leaving space for a continuous, minimum 2 inches (50.80 mm) weld beyond outside edge of fasteners and discs.
Membrane Overlaps: Shingled with flow of water or parallel to flow of water.
End Laps: Overlapped a minimum of 3 inches (76.20 mm).
Welded Seams:
Inspect welded seams for continuity and integrity using a cotter pin puller or other suitable blunt object.
Welded Field Seams: Minimum 2 inches (50.80 mm) wide.
Test Seams:
Provide sample test seams each day prior to welding field seams.
Using scrap material, run at least two test seams, each a minimum of 2 feet (0.6 m) long.
Use each test seam to determine adequate seam strength and to ensure equipment has warmed up, is operating properly, and proper settings have been determined.
Conduct test seams each time equipment is turned on after a cool down period.
** NOTE TO SPECIFIER ** See Mule-Hide Technical Bulletin TPO-MA-02-2006.
Perimeter Enhancements:
Install fastening enhancements at perimeters with manufacturer approved fastening systems at predetermined spacing.
Perimeter Enhancements are depended upon building height, wind zone locations, and warranty duration.
Determine perimeter areas using one of the following methods:
Manufacturer's Technical Bulletin addressing Standard Fastening Patterns and Guidelines.
Minimum Perimeter Area: 8 feet (2.4 m) in from roof edge along exterior roof edges.
For Factory Mutual insured buildings, follow guidelines in FM's Loss Prevention Data Sheet 1-29. Contact manufacturer's warranty department for fastener spacing in compliance with FM 1-60 and 1-90 requirements.
Parapet Wall: Height of 8 feet (2.4 m) or greater do not require Perimeter Enhancements.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-UN-108A and MHT-UN-108B.
Parapets, walls, and expansion joints separating adjoining roofs of same elevation or roofs at a higher elevation than roof being installed are considered interior walls and do not require Perimeter Enhancements.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-UN-108A and MHT-UN-108B.
Roof edges and parapet walls separating other roof areas at a lower elevation than roof being installed are considered exterior edges/parapets when the difference in elevation is 3 feet (0.9 m) or more and require installation of Perimeter Enhancements.
For roof heights of 70 feet (21.3 m) or greater and located in wind zones higher than 80 mph or for projects requesting enhanced wind speed warranties, manufacturer requires compliance with FM guidelines when determining extent of the perimeter enhancements.
Methods for Perimeter Enhancements:
Form Perimeter Enhancements by using individual 4-foot or 6-foot wide sheets, subdividing 8-foot, 10-foot, or 12-foot wide field sheets using 10 inches (254 mm) wide Pressure-Sensitive RUSS strip, or by installing rows of seam fastening plates through top of membrane and patching with appropriate materials.
Individual Perimeter Sheets Method:
Position membrane along perimeter of roof over acceptable insulation/underlayment.
Use 4-foot perimeter sheets with 8-field sheets.
Use 6-foot perimeter sheets 10-foot and 12-foot field sheets.
Over steel roof decks.
Run seams perpendicular to ribs of deck.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-FM-308B.
This requirement requires perimeter sheets be turned on two sides of roof where seams are running parallel with flutes of deck so seams in perimeter sheets run perpendicular to the deck flutes.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-FM-308A.
In lieu of changing orientation of perimeter half sheets where seams would normally run parallel to deck flutes, Contractor may install fastener row fingers.
10 inches (254 mm) RUSS Method.
When field sheets are positioned parallel to roof perimeter, place 10 inches (254 mm) wide Sure-Weld Pressure-Sensitive RUSS with 3 inches (76.20 mm) wide tape each side down center of 8-foot, 10-foot, or 12-foot wide TPO field membrane sheets. When 10 inches (254 mm) RUSS divides field sheet in half, two perimeter sheets result.
Unroll and position 10 inches (254 mm) wide TPO Pressure-Sensitive RUSS over insulation substrate where membrane securement is required. Locate the RUSS with fastener markings and tape facing upwards.
Position Seam Plates at same spacing as field sheets and secure with appropriate fastener. Do not fasten plates over top of release liner or liner will tear when removed.
Remove dirt or dust resulting from plate installation. Residual dust/dirt is detrimental to bond strength of tape adhesive.
Position TPO membrane and thoroughly clean underside of membrane using Weathered Membrane Cleaner. Membrane surface where tape is in contact must be clean. Adhesive on TPO Pressure Sensitive RUSS will not adhere to dusty or dirty surfaces.
Using a manufacturer approved cleaning pad, apply TPO Primer to underside of TPO membrane in a circular motion in area that will come in contact with the two strips of 3 inches (76.20 mm) wide tape. Primed area to be uniform in color without streaks and free from globs or puddles.
Remove release liner from tape on TPO Pressure-Sensitive RUSS by pulling it parallel to roof deck.
When TPO Primer has dried to the touch but is still tacky, roll deck membrane onto exposed tape and apply hand pressure to seam area.
Roll the entire 10 inches (254 mm) width of TPO Pressure-Sensitive RUSS seam area with a 2 inches (50.80 mm) wide roller using positive pressure.
To achieve proper adhesion of TPO Pressure-Sensitive RUSS when job site temperatures fall below 40 Degrees F (5 Degrees C), heat cleaned and primed area of TPO membrane with a hot air gun as it is applied and pressed into tape.
Over Steel Roof Decks:
When field membrane sheets extend perpendicular to edge of roof, position 10 inches (254 mm) RUSS beneath membrane along center of each field sheet extending a distance equal to 0.4 times building height to create perimeter enhancements.
Fastening Plates Method.
In lieu of RUSS securement method, prior to installation of field membrane, position row of seam fastening plates down center of the 8-foot, 10-foot, or 12-foot wide field sheets after being placed in position. Secure plates with appropriate fastener and overlay plates with 6 inches (152.40 mm) wide Pressure-Sensitive TPO Cover Strip or 6 inches (152.40 mm) Reinforced TPO Cover Strip, hot air welded to field membrane.
On projects with warranties of 20-years or more, overlay plates and fasteners with 6 inches (152.40 mm) Reinforced TPO Cover Strip and hot air weld to field membrane. Apply Cut Edge Sealant to cut edges of Reinforced TPO Cover Strip.
Buildings with Special Conditions:
Air pressurized buildings, canopies, and buildings with large openings where total wall openings exceed 10 percent of total wall area on which openings are located like airport hangars, warehouses, and large maintenance facilities will typically require additional perimeter enhancement.
Buildings with Large Openings: When wall contains major openings with a combined area exceeding 10 percent of total wall area where openings are located, a minimum of four perimeter sheets, centered over opening are required.
As an option to the perimeter securement, use an adhered membrane section in lieu of mechanically fastened membrane at large openings.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-MA-103A.
Install in accordance with manufacturer's written requirements.
Depth of Perimeter Area: No less than 2.5 times width of the opening.
Buildings with Overhangs:
Perimeter sheets installed over entire overhang area extending onto main roof deck when at the same level.
** NOTE TO SPECIFIER ** See Mule-Hide Details #MHT-MA-103B.
Adhered membrane section may be used in lieu of the mechanically fastened membrane at building overhangs in accordance with manufacturer's written requirements.
Field areas.
Membrane to run perpendicular to direction of steel deck flutes and orientation of wood decks where possible.
FIELD SHEET ATTACHMENT
** NOTE TO SPECIFIER ** The 10-foot wide Mule-Hide TPO Self Adhering Membrane is fully adhered to an approved insulation or substrate with factory applied pressure-sensitive adhesive.
Position TPO Self Adhering membrane over acceptable substrate.
Fold membrane sheet back so half of underside is exposed.
Remove release liner on one half of sheet starting from split in liner at middle of sheet. Remove liner at an angle to reduce risk of splitting or tearing.
Roll membrane onto substrate and avoid wrinkles.
For best adhesion, roll membrane onto substrate at an angle with a minimum 50-pound weighted roller.
Maintain large curve on leading edge of membrane to eliminate creases and bubbles.
Fold back remaining half of sheet and repeat process.
Do not run seams through field drains or sumps. Cut-out seams running through drains and install: 36 x 36 inches (914.40 x 914.40 mm) target patches.
WELDING OF LAP AREAS
General:
** NOTE TO SPECIFIER ** Side laps have a selvage edge that allows them to be heat welded together.
End laps must be butted together and covered with a minimum 6 inches (152.40 mm) W strip of reinforced membrane that is heat welded along edges.
Reference Mule-Hide Detail MHT-UN-104E.
Reference manufacturer's written requirements for heat welding.
Surfaces being welded to be clean and dry.
TPO Self Adhering Roofing Membrane: Hot air welded only.
Seaming membrane to membrane and flashing/detail membrane to membrane is only allowed by hot air welding.
Apply cut edge sealant to cut edges of reinforced membrane.
Hot Air Welding.
Comply with hot air welding equipment manufacturer's written instructions for use.
Comply with the requirements of the Authorities Having Jurisdiction regarding electric grounding, supply, and other related functions.
Use a portable generator for hot air welding equipment power.
Automatic welding machines for field sheet seaming is required.
Hand welding is allowed for flashings and seams where the automatic welder cannot be used.
Hand-held Welding Equipment for Membrane:
After preheated nozzle tip is applied in overlap area and material starts to soften, immediately follow with a silicone hand roller to press heated membrane surfaces together with slow, even movements.
Keep roller within 1 inch (25.40 mm) of nozzle tip.
Angle hot air tool so flowing air faces roller.
Test seam strength when cooled and a minimum of 8-hours after hot air welding is complete.
** NOTE TO SPECIFIER ** For T-joint Covers, see manufacturer's Detail MHT-UN-105B.
T-Joint Covers.
Comply with manufacturer's written instructions.
Separate T-joint patches are required over T-joints.
For 45-mil Membrane and Maximum Warranty Length of 15-years.
Give careful attention to T-lap seams formed where second perpendicular half-sheet overlaps butt ends of field sheets.
To ensure proper seaming of the T-joints, crease top layer of Heat-Weld Membrane a minimum of 1 inch (25.40 mm) into lower layer of membrane by using heat gun with narrow or pencil tip nozzle and rubber hand roller.
Inserting heat gun nozzle between layers of membrane, membrane will soften and begin to flow allowing it to crease and seal completely after applying pressure with hand roller to ensure adequate bonding of the softened material.
T-Joint Covers.
** NOTE TO SPECIFIER ** For T-joint Covers, see manufacturer's Detail MHT-UN-105A.
After heat-sealing T-joint, apply Edge Sealant on cut edges of reinforced membrane.
** NOTE TO SPECIFIER ** For T-joint Covers, see manufacturer's Detail MHT-UN-105B.
For 45-mil Membrane and Maximum Warranty Length of 15-years, separate T-joint patches are required over T-joints.
** NOTE TO SPECIFIER ** For Patches, see manufacturer's Detail MHT-UN-105C.
Seam Patches at Roof/Wall Transitions.
Installation of Non-Reinforced TPO Flashing Membrane patches over seams that transition from the horizontal to vertical is required.
Patches constructed with Non-Reinforced TPO Flashing Membrane only.
Daily Welding Equipment Setup.
Provide sample test seams each day prior to welding field seams.
Using scrap material, run at least two test seams, each a minimum of 2 feet (0.6 m) long.
Use each test seam to determine adequate seam strength and to ensure equipment has warmed up, is operating properly, and proper settings have been determined.
Conduct test seams each time equipment is turned on after a cool down period.
Quality Control of Seams.
After seaming, check seams with a probe for integrity.
Repair openings or fishmouths with hand-held hot air tool fitted with a narrow nozzle tip and with a roller.
Each day, attempt to pull apart several sections of welded seams to test quality of welds.
Should welds be deficient, conduct a more thorough examination of the Work and make necessary repairs.
INDUCTION WELDING
General:
Work to begin at highest point of roof level and proceed to lowest point.
Work completed each day to include flashings, terminations, and daily seals.
Prepare existing roof deck or substrate in accordance with manufacturer's written instructions.
Installation: Reference manufacturer's written requirements.
Induction Welding Plates:
Position Induction Welding Plates over substrate with row and fastener spacing as determined by project requirements.
** NOTE TO SPECIFIER ** Consult manufacturer's Technical Department for attachment requirements.
Comply with manufacturer's attachment requirements.
Induction Welding Plate to match type of Heat-Weld membrane being installed.
Only TPO plates may be used with TPO membranes.
Induction Welding Plates are not for use with fleece backed membranes.
Membrane Installation and Hot Air Welding:
Place membrane over substrate with minimum 3 inches (76.20 mm) overlap at lap seams and position so laps will shed water.
Allow membrane to relax.
Hot-air weld seams with automatic welder to achieve a minimum 2 inches (50.80 mm) wide heat weld.
Bond Heat-Weld membrane to Induction Welding Plates with Induction Welding Tool.
If expanded or extruded polystyrene insulation is top layer, install RhinoBond Cardboard Disc's between plate and insulation.
Additional Membrane Securement:
Secure membrane at perimeter of each individual roof area, projections, and angle changes that exceed 2 inches (50.80 mm) per lineal foot.
Consult manufacturer's published detail drawings.
Membrane Flashing:
Remove existing base flashings or cover with suitable material.
Install new membrane flashings in accordance with manufacturer's written requirements.
Terminate flashings along top edge in accordance with manufacturer's published details.
ADDITIONAL MEMBRANE SECUREMENT (BASE ATTACHMENT).
** NOTE TO SPECIFIER ** See Manufacturer's standard details for requirements and placement.
Provide additional securement of TPO membrane by mechanical attachment at perimeter of each roof level, base of walls, curbs, skylights, expansion joints, tie-ins, interior walls, bottom of valleys and angle changes that exceed inclines of 2:12 (2 inches (50.80 mm) rise in 12 inches (304.80 mm)) and various penetrations.
Securement: Horizontal to roof deck or vertical to base of various penetrations.
Mechanical Attachment to Membrane:
Seam Plate: 2.4 inches (60.96 mm).
Required fasteners.
Place Seam Plate and fasteners with edge of seam plate 1/2 inches (12.70 mm) away from angle change.
Place Seam Plates horizontally or vertically dependent upon project conditions.
All Purpose Bar:
Extruded aluminum bar with pre-punched holes 6 inches (152.40 mm) on center.
Place bar horizontally or vertically dependent upon project conditions and manufacturer's details.
Maximum Spacing of Fasteners: Not-to-exceed 12 inches (304.80 mm) on center.
Space adjoining bars 1/2 to 1 inch (12.70 to 25.40 mm) apart.
Attach bars at ends a maximum of 1 inch (25.40 mm) from end of each bar. Pre-drilling of additional holes may be required.
Deburr cut bars.
Use manufacturer approved TPO 0.045 Reinforced 6 to strip-in All Purpose Bar with a continuous, minimum of 1-1/2 inches (38.10 mm) wide weld.
Install All Purpose Bar a minimum of 3 inches (76.20 mm) to a maximum of 6 inches (152.40 mm) from inside and outside corners.
Attachment Strip: Use manufacturer approved 6 inches (152.40 mm) wide standard reinforced membrane TPO attachment strip.
Install 6 inches (152.40 mm) wide reinforced strip of TPO membrane at base of walls and curbs.
Provide 2.4 inches (60.96 mm) Seam Plates to attach reinforced strip of TPO membrane horizontally with appropriate fasteners.
Install 6 inches (152.40 mm) strip of reinforced TPO membrane prior to placement of field sheet.
Place 6 inches (152.40 mm) strip of reinforced TPO membrane on horizontal surfaces only and not turned up vertically.
Primer is not required to prepare the 6 inches (152.40 mm) wide strip.
Reinforced TPO membrane strip must be clean and dry.
Spacing of Fasteners: Not-to-exceed 12 inches (304.80 mm) on center. Space adjoining reinforced TPO strips a maximum of 1 inch (25.40 mm) apart. Overlap of reinforced TPO strips is not required.
For horizontal attachment, place 6 inches (152.40 mm) strip of reinforced TPO membrane a maximum of 1/2 inches (12.70 mm) from base of angle change extending out onto horizontal surface (roof substrate).
Place 2.4 inches (60.96 mm) Seam Plate a minimum of 1/2 inches (12.70 mm) to a maximum of 1 inch (25.40 mm) from exterior edge of strip.
Install plates a minimum of 6 inches (152.40 mm) to a maximum of 9 inches (228.60 mm) from the inside and outside corners.
Drip Edge and Gravel Stop.
Metal flange to extend a minimum of 3 inches (76.20 mm) onto wood nailer.
Wood nailer to be wider than metal flange.
Install approved screw fasteners a maximum of 6 inches (152.40 mm) on center and 1/2 inches (12.70 mm) to 3/4 inches (19.05 mm) from inside edge of metal flange.
Space ring shank nails a maximum of 4 inches (101.60 mm) on center.
If using non-TPO coated metal, prime with manufacturer approved TPO Primer or Low VOC Primer and strip with manufacturer approved cover strip.
If required, clean metal with a toluene or xylene solvent to remove oil film prior to installation and priming with TPO Primer.
** NOTE TO SPECIFIER ** Vertical flashings in a Fully Adhered TPO Self Adhering Membrane Roofing System must be made with reinforced TPO membrane. Depending on the base attachment detail used, vertical flashings may be standard TPO-c 60 mil membrane (MHT-UN-305A or MHT-UN-305B) or TPO 60 mil Self Adhering membrane (MHT-FA-305C).
See manufacturer's adhesive options for wall flashings (TPO only, not SA TPO):
When using Mule-Hide All-Purpose Bar under counterflashing to terminate wall flashing or when coping is used, the wall flashings may be loosely installed when flashing height is 12 -18 inches (457.20 mm) or less, depending on the type of termination. Refer to Mule-Hide's published Standard TPO details for additional information.
Specific climatic and job conditions may require the use of a vapor retarder.
It is the sole responsibility of the design professional to determine the need for a vapor retarder (which may be required by local building or energy codes) and its type and location in the roofing system.
A vapor retarder may often act as an "air barrier" which may have a positive effect in reducing internal air pressure. Vapor retarders should be strongly considered for buildings subject to high internal air pressures such as airplane hangars and buildings with many loading bays such as warehouse facilities.
The National Roofing Contractors Association recommends the installation of vapor retarders when interior relative humidity is 45 percent or greater and the outside mean average January temperature is below 40 degrees F.
In reroofing where existing built-up roof is to remain, built-up roof may be an adequate vapor retarder provided splits or tears are repaired to provide a total barrier to vapor penetration.
Projects utilizing Mule-Hide's F5 Air & Vapor Barrier must follow Mule-Hide's installation instructions and details for the F5 Air & Vapor Barrier.
VAPOR RETARDER INSTALLATION
Install vapor retarder over suitable substrate in accordance with manufacturer's written installation instructions and details.
Install with side laps, end laps, and penetrations sealed.
WOOD NAILER INSTALLATION
Wood nailers are required at roof perimeter edges with metal edging and gutter systems or where shown on manufacturer's standard TPO details.
Firmly anchor nailers to decks at a maximum 2 feet (0.6 m) on center and to resist a pullout force of 200 lbs per linear foot (297.6 kg per linear meter) in any direction.
Provide a 1/2 inches (12.70 mm) vent space between adjacent lengths of nailers.
Install fasteners within 6 inches (152.40 mm) of each end. Spacing and fastener embedment to conform to FM Loss Prevention Data Sheet 1-49.
Height of Nailers: Match surface level of insulation and roof membrane.
Width of Wood Nailer: Extend beyond metal flange to prevent damage to membrane.
Reused woodwork to be free of rot and resist a minimum force of 200 lbs per linear foot (297.6 kg per linear meter) in any direction.
Wood nailers with creosote and asphaltic preservatives are not permitted.
Pressure treated lumber is not required unless specified by Architect.
** NOTE TO SPECIFIER ** When a Mule-Hide Premium System Warranty is requested, only Mule-Hide labeled insulation may be used unless written approval is obtained, prior to job bid, for an alternative insulation.
Insulation other than Mule-Hide labeled insulation must be an FM approved insulation and approved by Mule-Hide for use under the Mule-Hide Fully Adhered TPO Roofing System.
Reference the insulation manufacturers guidelines for the appropriate type, size and thickness of the insulation needed for use over the respective substrate and under the Mule-Hide TPO Roofing System.
Contact Mule-Hide Technical Department prior to bidding the project to determine approved insulations and assemblies.
INSULATION INSTALLATION
Install and secure to roof deck in accordance with manufacturer's written instructions, approved submittals, and in proper relationship with adjacent construction.
Neatly cut to fit around penetrations and projections with a maximum allowable gap of 1/4 inches (6.35 mm).
Repair open joints with like insulation material.
Feather or taper insulation to provide a minimum sump area of: 36 x 36 inches (914.40 x 914.40 mm) at drains, where possible.
Install crickets and saddles beneath specified insulation where possible. Crickets and saddles made from non-compatible insulations materials must be overlaid with a manufacturer approved insulation or underlayment.
Do not install insulation in inclement weather.
Install no more roof insulation in one day than can be covered with TPO Membrane or when inclement weather is expected.
Inspect insulation installed over steel decks to ensure no edges are left unsupported along the flutes.
Install insulation in sufficient thickness and density to prevent breakage under normal roof construction traffic.
Offset end joints of each row of insulation against the previous row. When more than one layer of insulation is used, lay succeeding layers staggered in relation to previous layer of insulation and offset joints.
Mechanical Attachment:
Insulation fastening density will vary based on insulation type, thickness, and required warranty.
Increased fastening density may be required by the Authorities Having Jurisdiction or project wind speed and wind uplift requirements. Confirm with Architect.
Minimum Attachment Rates:
2-foot x 4-foot Boards: Two per board.
4-foot x 4-foot Boards: Four per board.
4-foot x 8-foot Boards: Six per board up to 2 inches (50.80 mm) thick.
4-foot x 8-foot Boards: Five per board, 5 inches (127 mm) thick or greater.
Number of Fasteners per 4-foot x 8-foot Board:
Polyisocyanurate, minimum 2 inches (50.80 mm) thick (top layer):
Field: 8.
Perimeter: 12.
Corner: 16.
Polyisocyanurate, minimum 1-1/2 inches (38.10 mm) up to 2 inches (50.80 mm) thick:
Field: 12.
Perimeter: 18.
Corner: 24.
Polyisocyanurate, minimum 1 inch (25.40 mm) to 1-1/2 inches (38.10 mm) thick:
Field: 16.
Perimeter: 24.
Corner: 32.
1/2 inches (12.70 mm) HD Poly-ISO, installed over approved insulation:
Field: 16.
Perimeter: 24.
Corner: 32.
HD Fiberboard, minimum 1/2 inches (12.70 mm) thick, installed over approved insulation:
Field: 16.
Perimeter: 24.
Corner: 32.
Roof Board: Minimum 1/4 inches (6.35 mm) thick, installed over approved insulation:
Field: 12.
Perimeter: 18.
Corner: 24.
Oriented Strand Board: Minimum 7/16 inches (11.11 mm) thick, installed over approved insulation:
Field: 17.
Perimeter: 25.
Corner: 32.
Approved Oriented Strand Board (OSB)/Polyisocyanurate Composite: Minimum 2 inches (50.80 mm) thick:
Field: 17.
Perimeter: 25.
Corner: 32.
** NOTE TO SPECIFIER ** Width of roof perimeter and corner areas is defined as the smaller of 0.1 times the building lesser plan dimension or 0.4 times the eave height (mean roof height for slopes greater than 2: 12 slope), except for heights greater than 60 feet (18.3 m). Contact manufacturer for Factory Mutual projects exceeding 60-foot heights.
Perimeter Enhancements:
To meet increased uplift requirements in the perimeters and corners of each roof area, comply with additional insulation attachment provisions as follows:
Minimum width of perimeter and corner areas no less than 8 feet (2.4 m).
Perimeters: Increase insulation attachment 50 percent over the field attachment requirements with a maximum of one fastener every 1-square foot.
Corners: Increase insulation attachment 100 percent over field attachment requirements with a maximum of one fastener every 1-square foot.
Factory Mutual Projects: Minimum width of perimeter and corner areas no less than 3 feet (0.9 m).
Slipsheet:
If slipsheet is required, install roof membrane immediately after slipsheet to prevent displacement.
Overlap slipsheet a minimum of 4 inches (101.60 mm) on each edge.
Plates and fasteners may be necessary to anchor slipsheet when installing in windy conditions.
Use sufficient fasteners to ensure slipsheet lays flat under roof membrane.
Adhesive Attachment:
Application surface to be clean, dry, and free of fins, protrusions, sharp edges, loose and foreign materials, oil, and grease.
Fill depressions greater than 1/4 inches (6.35 mm) with approved adhesive or patching material.
Remove sharp projections.
Prime previously unoxidized (shiny) asphalt with approved contact adhesive.
Seal gaps between wall/penetration and concrete deck with air and vapor barrier, expanding foam insulation, or manufacturer approved material to avoid condensation issues and positive pressure from air infiltration.
Apply adhesive when substrate and ambient temperatures are 25 Degrees F or above when spraying or extruding with heated or non-heated equipment.
Dispense adhesive between 300 to 800 psi in accordance with equipment used.
** NOTE TO SPECIFIER ** CAUTION: Gaps between horizontal and vertical surfaces of the roof area as well as gaps around penetrations must be sealed to prevent interior warm air from infiltrating and condensing within the roofing assembly. Condensing moisture could weaken bottom insulation facer and eventually result in dislodgement or loose boards when adhesive is used.
Projects utilizing Mule-Hide's F5 Air & Vapor Barrier must comply with Mule-Hide's installation requirements and published details.
Adhesive Installation:
Install in accordance with manufacturer's written instructions.
Adhesive Installation to Substrate:
Fully Adhered Applications: Spray adhesive to obtain full coverage, 1/8 to 1/4 inch (3.17 to 6.35 mm) thick after foaming.
Bead Applications: Apply adhesive at 4 inches (101.60 mm), 6 inches (152.40 mm), or 12 inches (304.80 mm) on center with a minimum 1/2 inches (12.70 mm) wide wet bead.
For Steel Decks: Bead attachment of adhesive to run parallel with and on top of steel deck flutes.
Comply with manufacturer's bead spacing requirements.
Consult manufacturer for Factory Mutual bead spacing requirements.
Allow adhesive to rise and develop string/body, 1-1/2 to 2-minutes. String time will vary based on environmental conditions.
Do not allow the adhesive to over-cure and lose tack prior to setting insulation boards.
Place insulation boards, maximum: 4 x 4 feet (1.2 x 1.2 m) into adhesive after allowing adhesive to rise and develop string/body.
Designate one person to walk boards into place.
Roll boards between 5-7 minutes from initial adhesive application.
Boards may be temporarily weighted or relief-cut where necessary to keep boards in constant contact with adhesive until cured.
At beginning of insulation attachment process and periodically throughout day, check adhesion of boards to ensure a tight bond and maximum contact is achieved.
FLASHING INSTALLATION
Surfaces to be compatible with flashings, clean, dry, smooth and with no excessive surface roughness.
Recover Projects:
Tear off existing base flashings, cant strips and projection flashings down to the substrate.
Repair uncovered deteriorated areas of substrate to provide a suitable substrate for new TPO flashings.
Double Sided Contact Adhesive:
Double sided contact adhesive approved my membrane manufacturer.
Comply with manufacturer's written instructions.
Low VOC Bonding Adhesives require mechanical stirring (electric drill), both initially and periodically during application.
Porous surfaces and substrates require application of prime coat and second coat of Low VOC Bonding Adhesive to accomplish proper adhesion.
Do not apply adhesive in area of seam laps.
Allow adhesive to dry to a tacky state.
Test adhesive for tacky state.
Adhesive is ready to mate when it is tacky but does not string when pulled.
Ensure adhesive is dry in accordance with manufacturers written requirements.
Avoid thin layers of adhesive which can result in over drying and improper adhesion.
Roll coated membrane onto substrate being careful not to wrinkle sheet or trap air bubbles.
Do not apply TPO Bonding Adhesive to areas of flashings and membrane to be welded.
Extended drying times may be required during cool, overcast, humid, shaded, or late day applications.
Adhesive must be dry, but still tacky, prior to mating surfaces to avoid permanent blisters due to trapped solvents.
Extend flashings a minimum of 8 inches (203.20 mm) above roof membrane level and terminate unless previously accepted by Owner.
Heat Welding:
Extend TPO Membrane Flashings a minimum of 6 inches (152.40 mm) onto field sheet and adhere securely. A minimum of 2 inches (50.80 mm) between front of fastener plates and edge of sheet to allow for heat welding is required. Overlap side laps a minimum of 2 inches (50.80 mm).
Do not use TPO Bonding Adhesive on areas of flashings and membrane to be welded.
Apply Cut Edge Sealant at welded edges of cut membrane flashings.
Hot air weld flashings at connections with roofing membrane. Hand welds to be a minimum of 1-1/2 inches (38.10 mm) wide.
Terminate flashings in accordance with manufacturer's standard details.
** NOTE TO SPECIFIER ** Option below is for MuleHide AeroWeb Product.
Double Sided Contact Adhesive:
Comply with manufacturer's written instructions for spray gun preparation and use.
Apply double sided contact adhesive at ambient temperature of 25 Degrees F and above. Keep propellant in cylinders above 70 Degrees F.
Utilize power-heated blanket and hot boxes when necessary.
Apply adhesive to substrate that is clean, dry, and free of debris and contaminants.
Application to be continuous and uniform, avoiding globs or puddles.
Spray substrate and back of membrane with enough overlap to ensure 100 percent coverage (2 to 3 inches (50.80 to 76.20 mm) overlap).
Do not apply adhesive to splice areas or areas of seam laps.
Roll coated membrane onto substrate being careful not to wrinkle sheet or trap air bubbles.
Once membrane is mated to substrate, thoroughly broom into place with stiff bristled push broom to ensure proper contact and 100 percent adhesion.
Repeat this procedure for remaining sheets.
** NOTE TO SPECIFIER ** Option below is for Aqua Base 120 Bonding Adhesive.
Bonding Adhesive:
Comply with manufacturer's written instructions for preparation and use.
Allow adhesive to dry until it turns yellow and does not transfer to a dry finger or pull away from substrate. Adhesive must remain tacky.
Mate surfaces together avoiding wrinkles. Immediately roll bonded area of sheet with a 2 inches (50.80 mm) wide rubber hand roller to promote maximum positive contact between membrane and substrate. Overlap adjacent flashing sheets a minimum of 2 inches (50.80 mm).
Do not apply adhesive in area to be heat-welded.
Extended drying times can be expected during cool, overcast, humid, shaded, or late day applications. Adhesive must be dry, but still tacky, before mating surfaces to avoid permanent blisters due to trapped moisture.
TPO Membrane Flashings to extend a minimum of 6 inches (152.40 mm) onto field sheet and adhere securely. Provide a minimum of 2 inches (50.80 mm) between front of fastener plates and edge of sheet to allow for heat welding. Side laps to overlap a minimum of 2 inches (50.80 mm).
Extend flashings a minimum of 8 inches (203.20 mm) above roof membrane level and terminate unless previously accepted by Owner. Hot air weld flashings at connections with roofing membrane. Apply Cut Edge Sealant at welded edges of cut membrane flashings.
After flashing is adhered in place, promote full contact adhesion by going back over entire area with a 2 inches (50.80 mm) rubber hand roller.
Hand welds a minimum of 1-1/2 inches (38.10 mm) wide.
Properly terminate flashings in accordance with manufacturer's written instructions and standard details.
** NOTE TO SPECIFIER ** When using Mule-Hide All-Purpose Bar under Counterflashing to terminate wall flashing or when coping is used, TPO Bonding Adhesive, Low VOC Bonding Adhesive, Low VOC Bonding Adhesive - 1168, or Aqua Base 120 Bonding Adhesive may be eliminated when flashing height is 12 inches (304.80 mm) to 18 inches (457.20 mm) or less, depending on the type of termination. Refer to Mule-Hide's published Standard TPO Details for additional information.
DRAINS, EXPANSION JOINTS, PITCH PANS
Roof Drains:
Remove existing roofing materials and metal flashings.
Prepare surface around each drain to prevent distortion, tenting, or bridging of membrane. Provide smooth transition from the roof surface to the surface of the drain bowl/clamping ring.
Do not run field seams through drains or sumps. If sheet layout causes seam to fall in line with drain, install target patch, minimum: 36 x 36 inches (914.40 x 914.40 mm).
Apply one full tube of water cut-off mastic to each drain. Apply to drain bowl, under membrane, where clamping ring will be seated to provide a continuous seal between membrane and drain bowl.
Flashing Expansion Joints:
Reference manufacturer's standard details and written instructions for installation requirements.
Pitch Pans:
Install and flash pitch pans as required by manufacturer's written instructions and standard details.
Fill pitch pans with Thermoplastic One-Part Pourable Sealer.
WALKWAYS
Provide walkways in areas where routine rooftop maintenance and regular rooftop traffic is expected.
TPO Walkway Installation:
Install walkways over clean, dry surfaces.
Layout areas where walkway pads will be installed with material oriented to be placed between field seams with each adjacent and abutting section gapped a minimum of 6 inches (152.40 mm).
Do not install walkway pads over seams or flashings.
Heat weld perimeter of the properly positioned TPO Walkway Roll.
Check seams for voids or inconsistencies that might prevent watertightness.
Precast Pavers:
Install manufacturer's approved precast paver systems over one layer of 6-ounce HP protection mat or other manufacturer approved slip sheet material.
TEMPORARY TIE-INS
Install temporary cutoffs around incomplete edges of roofing assembly at end of each workday and when work is postponed due to inclement weather.
Position temporary tie-ins so sealed membrane edge will not buck or pond water.
Do not restrict drainage.
Remove gravel, dirt, debris, or other contaminants from tie-in area and ensure surfaces are clean and dry.
Seal loose membrane edges downslope with products compatible with substrate and membrane type.
Provide continuous pressure along sealed edge to prevent water migration under finished roof sections.
When work resumes, remove temporary seals. contaminated membrane, sealants, and insulation fillers from work area and dispose in accordance with project waste management requirements.
FIELD QUALITY CONTROL
Field Inspection: Coordinate field inspection in accordance with manufacturer's written requirements and Division 01, General Requirements.
** NOTE TO SPECIFIER ** Include if manufacturer provides field quality control with onsite personnel for instruction or supervision of product installation, application, erection, or construction. Delete if not required.
Manufacturer's Services: Coordinate manufacturer's services in accordance with Division 01, General Requirements.
At completion of installation and if a system warranty is specified, require manufacturer's authorized representative to perform on-site inspection of roof to verify material and installation requirements are met.
CLEANING AND PROTECTION
Clean in accordance with the manufacturers written recommendations.
Clean both interior and exterior building areas affected by construction. Repair damaged areas to Owner's satisfaction.
Touch-up, repair or replace damaged products before Substantial Completion.
Field Inspection: Coordinate field inspection in accordance with appropriate sections in Division 01.