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SECTION 07540

THERMOPLASTIC MEMBRANE ROOFING (TPO)

** NOTE TO SPECIFIER ** ERSystems / Prairie Technologies; Roof system products.
.
This section is based on the products of ERSystems / Prairie Technogies, which is located at:
ERSystems / Prairie Technologies
6900 Bleck Dr.
Rockford, MN 55373
Toll Free: (800) 403-7747
Phone: (763) 565-6900
Fax: (763) 565-6901
Web Site: www.ersystems.com
E-mail: info@ersystems.com

ERSystems manufactures a complete line of the highest quality electrometric materials and systems - highly reflective coatings, sealants, membranes and adhesives - each having the capability to stretch, bend, and twist as the building moves. ERSystems was the first company to develop roof restoration systems specifically designed for its particular application: Metal Roofing and walls, Single Ply Membranes, Asphalt roofing, Spray Polyurethane Foam and masonry walls.

Since 1993 ERSystems has been a leader in cool roofing technology and a strong supporter of sustainable and renewable building technologies. The founder of ERSystems has been involved in roof coatings industry for over 30 years and was instrumental in developing the first acrylic coatings used in roofing. ERSystems is a charter member of the DOE's Energy Star Roof Products Program, was instrumental in developing the Cool Roof Rating Council, and was one of the first roof coatings manufacturers to have products that meet USGBC LEED requirements for reflectivity and emissivity.

ERSystems products are sold directly to roofing contractors by trained and experienced ERSystems technical salespeople. This sales group is the largest all employed sales force of any roof coatings company in the nation. Each salespersons technical experience and attention to quality maximizes the potential for trouble free application and long term performance on the roof.

This section includes Fully Adhered thermoplastic (TPO) roof membrane systems and Mechanically Fastened thermoplastic (TPO) roof membrane systems.

PART 1

GENERAL

1.1

SECTION INCLUDES

** NOTE TO SPECIFIER ** Delete items below not required for project.

Fully adhered thermoplastic (TPO) roof membrane systems including accessories.

Mechanically fastened thermoplastic (TPO) roof membrane systems including accessories.

Thermoplastic walkways.

1.2

RELATED SECTIONS

** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.

Section 05300 - Metal Deck: Installation and requirements.

Section 06100 - Rough Carpentry: Roof blocking and nailers.

Section 07220 - Roof Insulation: Installation and Requirements.

Section 07260 - Vapor Retarders: Installation and requirements.

Section 07620 - Sheet Metal Flashing and Trim: Metal flashing and counter flashing installation and requirements.

Section 07710 - Manufactured Roof Specialties: Copings, counterflashing systems, gutters, downspouts, and roof expansion assemblies.

Section 07724 - Roof Hatches: Frame and integral curb counterflashing.

Section 07720 - Roof Accessories: Manufactured curbs and roof hatches.

Section 08600 - Skylights: Skylight frame and integral curb counterflashing.

Section 15160 - Roof Drains.

1.3

REFERENCES

** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.

ANSI/SPRI-1A-1, Standard Field Test Procedure for Determining the Mechanical Uplift Resistance of Insulation Adhesives over Various Substrates.

ASTM C 208 - Standard Specification for Cellulosic Fiber Insulating Board.

ASTM C-578 - Standard Specification for Rigid Cellular Polystyrene Thermal Insulation.

ASTM D 6878 - Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing.

FM Data Sheet 1-29 - Wind Loads to Roof Systems and Roof Deck Securement.

FM Data Sheet 1-49, Perimeter Flashing.

FM 4470 - Approval Standard for Class 1 Roof Coverings.

ANSI A58.1/ASCE 7 - Minimum Design Loads for Buildings and Other Structures

1.4

DESIGN / PERFORMANCE REQUIREMENTS

** NOTE TO SPECIFIER ** Use the following paragraphs carefully; edit specification to identify system performance requirements or functional criteria. Delete references from the list below that are not actually required.

ERSystems TPO Adhered Membrane products are intended for use within the following limitations. Contact ERSystems if any of these conditions are anticipated to be exceeded.
- Fully adhered TPO to roof heights above 50 feet.
- Geographical locations above wind zone 2, per Factory Mutual's current edition of Loss Prevention Data Sheet 1-28.
- Geographical locations in a 100 mph or greater wind zone, per the ANSI 100 year mean recurrence interval wind isotach.
- Locations with a D exposure as determined by ANSI A58.1.
- Locations where the dead load of the roofing system exceed the structural capacity of the structure,
- Locations where chemical or hazardous materials are discharged onto the roof surfaces.

Conform to applicable code for roof assembly fire hazard requirements.

** NOTE TO SPECIFIER ** include the following paragraph only when roof insulation is not provided by the roof membrane manufacturer. Delete if not required.

Wind Load: Measure wind uplift calculations in accordance with applicable building code requirements. Comply with ANSI/SPRI-1A-1 Standard Field Test Procedure for Determining the Mechanical Uplift Resistance of Insulation Adhesives over Various Substrates to determine adequate load resistance.

** NOTE TO SPECIFIER ** Edit the following paragraph as appropriate to the applicable building code, and Insurance Underwriter requirements. Adhered roofing systems are currently eligible for FM 1-60 and 1-75 ratings using prescriptive perimeter and corner requirements of FM 1-29. Contact FM for additional information. Contact ERSystems if any of these ratings are anticipated to be exceeded.

FM 4470: Roof Assembly Classification, of Class ______ Construction, wind uplift requirement of ____, in accordance with FM Construction Bulletin 1-29.

1.5

SUBMITTALS

Submit under provisions of Section 01300.

Product Data: Manufacturer's data sheets on each product to be used, including:

Preparation instructions and recommendations.

Storage and handling requirements and recommendations.

Installation methods.

Shop Drawings: Plan of roof showing, location and type of penetrations, perimeter and penetration flashing detail references to roof membrane manufacture's standard.

** NOTE TO SPECIFIER ** Include the following paragraphs if a warranty is required. Delete if not required. Warranty pre-notification form must be completed and approved by ERSystems Technical Department prior to start of project.

Warranty Certification:

Submit manufacturer's warranty pre-notification form completed and approved by the roof membrane manufacturer prior to start of installation.

Submit manufacturer's completed warranty inspection report approved by the roof membrane manufacturer upon completion of installation.

Submit completed manufacturer's warranty upon completion of the work.

** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.

Selection Samples: For each finish product specified, two complete sets of color chips representing manufacturer's full range of available colors and patterns.

Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.

Manufacturer's Certificates: Certify products meet or exceed specified requirements.

Test Results:

Provide fastener pull tests from an independent testing agency after approval by the roofing manufacturer.

1.6

QUALITY ASSURANCE

Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with minimum ten years documented experience.

** NOTE TO SPECIFIER ** Roofing system must be installed by a ERSystems authorized contractor when a warranty is specified.

Installer Qualifications: Approved applicator shall be registered with ERSystems as a ERSystems Authorized Contractor.

Pre Roofing Conference:

Upon completion of roof deck installation and prior to any roofing application, the Contractor shall convene a pre-roofing conference.

Coordinate pre-roofing conference scheduling with the Architect. Conference shall be attended by the Contractor, Architect, personnel directly responsible for the installation of roofing and insulation, flashing and sheet metal work, mechanical and electrical work, other trades interfacing with the roof work, and representative of the roofing materials manufacturer.

Provide a copy of meeting notes and action items to all attending parties. Note action items requiring resolution prior to start of roof work.

Discuss specific expectations and responsibilities, construction procedures, specification requirements, application, environmental conditions, job and surface readiness, material storage, and protection.

Final Inspection: Provide Manufacturer's representative final inspection of roof to verify roof is in compliance with ERSystem's specifications. Submit completed punch lists for repairs generated during inspection to the Architect for review upon completion.

1.7

DELIVERY, STORAGE, AND HANDLING

Manufacturer's packaging to have labeling with manufacturer's name, product name and description.

Store products in manufacturer's unopened packaging with labeling intact until ready for installation.

Store roofing materials in a dry, warm, ventilated weathertight location.

Store components such as adhesives, caulking materials, sealant, etc at temperatures between 60 degrees F. and 80 degrees F. If exposed to lower temperatures, store at 60 degrees F. minimum temperature for three days before using.

Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.

Any materials damaged in handling or storage must not be used.

1.8

PROJECT CONDITIONS

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 absolute limits.

Cold temperatures will restrict the installation of the Permaweld TPO Roofing Systems. Follow specified precautions for storage of materials and expose only enough adhesive to be used within a four hour period. Consult ERSystems Technical Service for additional cold weather precautions.

** NOTE TO SPECIFIER ** The following requirements apply to all warranties:
Tie-ins to built-up (BUR) or any other type of roof system and flashings terminated to intermediate elements are not covered by ERSystems warranties. Wood nailers are not covered by ERSystems warranty. Pre-molded inside and outside corners must be used for all corner flashing details on total system warranties.

1.9

WARRANTY

** NOTE TO SPECIFIER ** Select the paragraph for the warranty required and delete the ones not required. The warranty applies only to products purchased from ERSystems and applies only to the original owners unless specifically waived in writing by ERSystems.

** NOTE TO SPECIFIER ** 5 and 10-year Warranties are available with .045 and .060 mil reinforced sheets.

Labor and Material Membrane Warranty: Provide a standard 5 year roof system warranty covering labor and materials for the ERSystems TPO membrane.

Labor and Material Membrane Warranty: Provide a standard 10 year roof system warranty covering labor and materials for the ERSystems TPO membrane.

** NOTE TO SPECIFIER ** 15 year Permaweld TPO Warranties requires the use of .060 mil reinforced sheet.

Labor and Material Membrane Warranty: Provide a standard 15 year roof system warranty covering labor and materials for the ERSystems TPO membrane.

1.10

COORDINATION

Coordinate Work with other operations and installation of connecting or adjacent materials to avoid damage to installed materials.

PART 2

PRODUCTS

2.1

MANUFACTURERS

Acceptable Manufacturer: ERSystems / Prairie Technologies, which is located at: 6900 Bleck Dr. ; Rockford, MN 55373; Toll Free Tel: 800-403-7747; Tel: 763-565-6900; Email: request info; Web: www.ersystems.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 provisions of Section 01600.

** NOTE TO SPECIFIER ** Edit the following paragraphs as required for the project. All components and details of warranted systems must be approved by ERSystems. Contact ERSystems for additional information.

2.2

MATERIALS

** NOTE TO SPECIFIER ** Select one of the following membrane paragraphs; coordinate with warranty requirements for material selected. Delete the material not required. Permaweld TPO, heat welded membrane sheets are available in 100 foot lengths.

Thermoplastic Membrane: Permaweld TPO, heat welded membrane sheets.

Membrane Thickness: 0.045 inch (1.15 mm) nominal thickness overall, scrim-reinforced, Ethylene Propylene-based sheet conforming to ASTM D 6878 specification for TPO-based roofing material.

Membrane Thickness: 0.060 inch (1.5 mm) nominal thickness overall, scrim-reinforced, Ethylene Propylene-based sheet conforming to ASTM 6878 specification for TPO-based roofing material.

Membrane Width: 6 foot 2 inch and 12 foot 4 inch.

Color:

** NOTE TO SPECIFIER ** The standard color is white. Custom colors are available but require a 30,000 square foot minimum order. Select one of the following two paragraphs and delete the one not required. Contact ERSystems for additional information.

White.

Custom as selected by the Architect.

TPO Bonding Adhesive: Use for bonding Permaweld TPO membrane to the approved substrate.

Silicone Caulk: Use for positive water seal at flashings and penetrations as indicated on the Drawings.

Pourable Sealer: Use for specific terminations, pitch pans and tie-ins to existing roofs.

Toluene or Toluol: Use for cleaning membrane before heat welding.

Termination Bar: A specially designed extruded aluminum bar for terminating Permaweld membrane.

Batten Bar: An extruded aluminum flat bar or galvalume steel bar for securing Permaweld membranes as detailed.

** NOTE TO SPECIFIER ** Pre-molded boots must be used on penetrations up to 12 inches in diameter. Unreinforced Permaweld TPO flashing is acceptable on penetrations where boots cannot be used.

Pre-molded Permaweld TPO Vent Boots: Heat welded boots for fast and positive flashing of all vent stacks, pipes and other round penetrations. Pre-molded boots must be used with stainless steel clamping rings.

** NOTE TO SPECIFIER ** Pre-molded inside and outside corners must be used on roofs with total system warranties.

Pre-molded Permaweld TPO Inside and Outside Corners: Heat welded corners for fast and positive flashing.

Screws, Stress Plates and Accessories: For attaching termination bars, batten bars, insulation, etc. All insulation fasteners must be FM Approved #14 fluorocarbon screws or fasteners of the appropriate length and approved stress plates. Fastener type, length and pull-out resistance shall be approved by roofing manufacturer.

** NOTE TO SPECIFIER ** Use for traffic protection on roof systems. Indicated walkway pattern required on the Drawings. Delete if not required.

Permaweld TPO Walkpads: Use for traffic protection of the roof systems.

** NOTE TO SPECIFIER ** The following insulation/underlayments are approved for use with Permaweld TPO Roof Systems: High density fiberboard, polyurethane, polyisocyanurate, and cellular glass. Perlite insulation is not recommended for installation directly under Permaweld TPO Membrane. Contact ERSystems for additional information.

Roof and deck Insulation: Provide roof and deck insulation approved by roof membrane manufacturer. Roof and Deck Insulation is specified in Section 07220.

** NOTE TO SPECIFIER ** Boardstock types, application and details for warranted systems shall be approved by the roof membrane manufacturer.

Boardstock: For use as a barrier board or insulation surface to provide an acceptable bonding substrate. Fiberboard must be a minimum 1/2 inch (12.5 mm) thick and conform to ASTM C 208.

** NOTE TO SPECIFIER ** When re-roofing directly over a smooth coal tar pitch or asphalt roof, when no insulation is required, a separator sheet must be used. Select one of the following two paragraphs and delete the one not required. Delete both if not required.

Separator Sheet: Amocor PB-6 underlayment board.

Separator Sheet: 6 mil polyethylene sheeting

** NOTE TO SPECIFIER ** The use and placement of a vapor retarder should be determined by Architect or Engineer. ERSystems does not require the use of vapor retarders. However, ERSystems recommends that a vapor retarder be considered when the outside average January temperature is below 40 degrees F, and the expected interior winter relative humidity is 45 percent or greater. Vapor retarders shall meet specified codes and insurance requirements and be compatible with insulation and other accessories. Delete if not required. Consult ERSystems Technical Service for vapor barrier requirements.

Vapor Retarder: Specified in Section 07260.

** NOTE TO SPECIFIER ** Wood Nailers shall be pressure treated, No. 2 construction-grade wood nailers for termite and rot resistance; creosote or asphaltic type preservatives must not be used. Wood Nailers shall be of a height sufficient to match the thickness of the insulation being used. Wood nailers are required for the attachment of drip aprons, gravel stops and certain expansion joints and may be required for metal scuppers, pitch pockets and certain types of curbs. Wood nailers shall be attached to withstand a minimum force of 200 lbs. in any direction. All nailers shall have a minimum of 2 fasteners per board.

Wood Nailers: Specified in Section 06100.

** NOTE TO SPECIFIER ** Sheet metal components such as gravel stops, drip aprons, counterflashings, copings, etc., should be fabricated and installed in accordance with the SMACNA requirements. Flashing details for warranted systems shall be approved by the roof membrane manufacturer. Contact ERSystems for additional information.

Sheet Metal Flashing and Trim: Specified in Section 07620.

** NOTE TO SPECIFIER ** Roof drains shall be provided and installed in accordance with regulatory requirements. Roof drains for warranted systems must be of types approved by the roof membrane manufacturer. Contact ERSystems for additional information.

Roof Drains: Specified in Section 15160. Provide approved roof drains for proper installation as required and detailed.

PART 3

EXECUTION

** NOTE TO SPECIFIER ** The following conditions and restrictions will apply to Roof System Installation. Contact ERSystems for additional information.
Do not use bitumen base, oil base, or plastic roof cements with the Permaweld TPO membrane.
Do not install Permaweld TPO membrane directly onto asphalt or coal tar pitch roofs.
Do not allow waste products (petroleum, grease, fats, oil, solvents, mineral oil) or direct steam venting to come in contact with Permaweld TPO membrane during seam installation.
In areas where grease, paint, or concentrated waste products (oil, solvents, etc.) will be left for long periods of time, a double layer of Permaweld TPO membrane is required. Install the additional layer 4 feet beyond the affected area. Periodic maintenance of these deposits is required
Do not install EPS insulation directly onto coal tar roof surface unless conditions satisfy the requirements published by the EPSystems.
Do not expose membrane and accessories to a constant temperature in excess of 1800 degree F.
Bonding adhesive is flammable. Do not breathe vapors or use near fire. Consult container labels and material safety data sheets for specific information.

3.1

EXAMINATION

Do not begin installation until substrates have been properly prepared in accordance with ERSystems requirements.

Verify deck is supported and secure.

Verify deck is clean and smooth, free of depressions, waves, or projections, properly sloped to drains and suitable for installation of roof system

Verify deck surfaces are dry and free of snow or ice.

Verify deck surfaces are properly sloped to drains.

If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

Any defects in the substrate must be corrected prior to installation.

3.2

PREPARATION

Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.

Surfaces on which the Permaweld TPO membrane is to be applied must be clean, smooth, free of fins, sharp edges, loose and foreign material, oil, grease, and other contaminants. Blisters or cracks greater than 1/4 inch (6.5 mm) in width must be repaired.

** NOTE TO SPECIFIER ** Steel decks must be 22 gauge or heavier. Because of the fluted design of most steel decks, fasteners must penetrate the deck a minimum of 1/2 inch (12.5 mm). On-site pullout tests are required to determine a minimum of 360 lbs. pullout resistance. Care must be taken to insure that all fasteners penetrate only the top flute of the steel deck. Select following paragraph for insulation covering or concrete fill and delete that paragraph not required.

Steel Deck:

Cover with an approved insulation mechanically fastened or adhered to the deck.

Overlaid with poured in place structural or an approved lightweight concrete in acceptable condition to the roofing manufacturer.

** NOTE TO SPECIFIER ** Concrete decks must have a compressive strength of 3,000 psi (20.68 MPa) or greater. For metal formed decks all fasteners must penetrate the top surface of the deck a minimum of 1 inch (25.5 mm). On-site pullout tests are required to determine a minimum of 800 lbs pullout resistance.

Concrete Deck:

Concrete shall be fully cured, and prepared smooth with dust removed.

Surface shall be dry, flat, clean, smooth, free of sharp edges and suitable for acceptance of membrane.

** NOTE TO SPECIFIER ** Wood planks must be tongue and groove wood planks 2 inches thick (51 mm) or heavier. All fasteners must penetrate the top surface of the deck a minimum of 1 inch (25.5 mm).

Wood Plank:

Covered with an approved insulation mechanically fastened or adhered to the deck.

** NOTE TO SPECIFIER ** Plywood must be tongue and groove 5/8 inch (16 mm) APA grade CDX plywood or heavier. All fasteners must penetrate the top surface of the deck a minimum of 1 inch (25.5 mm).

Plywood Deck:

Dry, flat, clean, smooth, free of sharp edges and suitable for acceptance of membrane.

** NOTE TO SPECIFIER ** Light weight decks (gypsum, Tectum, light weight concrete, etc.) requires submission of pullout test results to determine acceptability. Consult ERSystems Technical Service for specific definitions and fastening requirements.

Lightweight Cementitious Decks:

Cover with an approved insulation mechanically fastened or adhered to the deck.

Wood Nailers: Wood nailers are specified in Section 06100.

3.3

Provide wood nailers as indicated. Wood nailers are required to provide a termination point for roofing insulation as well as a securement point for base flashing securement.

3.4

Provide wood nailers at all roof edges where metalwork, drip edges, or gutter systems are specified. The width of the nailer must exceed the width of the flange of any metalwork mounted to it and be of equal thickness to the roof insulation in order to protect the edge of the insulation and provide a substrate to which the metalwork can be anchored, without impeding drainage. Wood nailers are also required under any rooftop curbs that are not mounted directly to the structural deck with the same width and thickness requirements stated above.

3.5

Wood Nailers must be #2 Grade or better lumber. Wood treated with preservatives containing creosote, asphalt, pentachlorophenol, copper naphthenate, copper 8-quinolinolate, and alkaline copper quatenaries (ACQ) have an adverse effect on single-ply roofing membranes and are not acceptable for use in a Permaweld TPO roofing system.

3.6

Anchor wood nailer to the deck in an industry as indicated on the Drawings. As a minimum standard, the wood nailers must be anchored sufficiently to resist 200 lbs (890 N) of force per linear foot in any direction with fasteners spaced not more than 24 inches (610 mm) apart. Refer to the Perimeter Flashing portion of Factory Loss Prevention Data 1-49 for nailer securement recommendations.

** NOTE TO SPECIFIER ** The following paragraphs relate to reproofing projects. Delete if not applicable. Contact ERSystems for additional information.

When a portion of the existing roof system or deck must be replaced, the replacement work must include sealing to prevent the penetration or migration of moisture.

** NOTE TO SPECIFIER ** When re-roofing directly over a smooth coal tar pitch or asphalt roof, when no insulation is required, a separator sheet must be used.

Prior to installing the TPO roofing system, apply an approved barrier or insulation board over an existing gravel surface, the gravel is to be broomed and removed from the roof. Surface shall be dry, smooth and even, blisters cut, and loose aggregate removed.

Installation of approved insulation or cover board shall comply with manufacturer's standards.

Roof deck must be free of ponding water within 48 hours of rainfall. Use corrective measures to provide positive drainage. Ponding at the membrane level shall be corrected by improved drainage design as required to eliminate "birdbathing" to less than 4 SF (0.37 sm), less than 1/2 inch (12.5 mm) deep areas.

All wall flashing areas must be smooth and dry. Irregular wall surfaces, old BUR, stucco, gypsum and rough stone are not suitable for flashing. These surfaces must be covered with a minimum 5/8 inch (6 mm) "wolmanized" or exterior-grade plywood fastened with ERSystems approved fasteners 2 feet (0.6 m) o/c to resist a minimum 200 lb (91 kg) pullout force.

Roof drain clamping rings and gravel guards must be removed and the existing roof materials and insulation stripped back. The drain casting must be cleaned to receive the membrane.

Barbed metal seam plates and appropriate fastener shall be used to anchor the membrane to the deck at perimeters and penetrations.

** NOTE TO SPECIFIER ** The use and placement of a vapor retarder should be determined by the Architect or Engineer. Vapor retarders shall meet specified codes and insurance requirements and be compatible with insulation and other accessories. Delete if not required.

3.7

VAPOR BARRIER INSTALLATION

Install vapor barrier as specified in Section 07260

3.8

INSULATION INSTALLATION

Roof and deck Insulation: Provide as specified in Section 07220. Conform to roof membrane manufacturers requirements.

Install insulation board with all joints staggered and tightly butted. If multiple layers are required, all joints between layers must be staggered a minimum of 6 inches (152 mm).

Butt insulation tight to fit around penetrations, projections, and nailers. Fill gaps in insulation boards greater than 1/4 inch (6.5 mm).

Set tapered insulation in accordance with insulation manufacturers requirement.

All insulation fasteners must be FM Approved #14 fluorocarbon screws or fasteners of the appropriate length with approved stress plates.

Do not place more insulation board than can be covered and waterproofed with the membrane by the end of the day.

Insulation placed on fluted steel decks must be of proper type and density to span the voids and support traffic.

Use a separator sheet of 6 mil polyethylene when the insulation board has an asphaltic facer or when installing directly over asphalt or coal tar pitch.

Consult applicable building codes for insulation and fire stop requirements.

** NOTE TO SPECIFIER ** The following two major paragraphs are for Adhered TPO Membrane Roofing Systems and Mechanically Fastened TPO Roofing Systems. Select the paragraphs for the system required and delete the system not required.

** NOTE TO SPECIFIER ** Tie-ins to built-up (BUR) or any other type of roof system and flashings terminated to intermediate elements are not covered by ERSystems warranties. Wood nailers are not covered by ERSystems warranty. Pre-molded inside and outside corners must be used for all corner flashing details on total system warranties. Consult ERSystems Technical Service for additional requirements.

3.9

ADHERED MEMBRANE INSTALLATION

Install in accordance with roof membrane manufacturer's instructions and the approved shop drawings.

Positioning Membrane:

Position the Permaweld TPO membrane over the approved substrate without stretching.

Allow the membrane to relax a minimum of 1/2 hour prior to any seaming or flashing.

Position all adjoining sheets in a manner that all sheets overlap a minimum of 2-1/2 inches (64 mm).

Adhering Membrane:

Fold sheet back so one-half of the underside of the sheet is exposed. Be sure the sheet fold is smooth with no wrinkles or buckles.

Stir Permaweld TPO Bonding Adhesive thoroughly to achieve a uniform mix with no marbling and no sediment on the bottom of the pail. DO NOT THIN.

Apply TPO Bonding Adhesive to the substrate and the membrane using a 9 inch (229 mm) medium nap roller, approved spray equipment (spray applied bonding adhesive must be back-rolled) or approved power roller equipment.

Apply one gallon (3.79 L) of solvent-based bonding adhesive per 60 sf (5.57 sm) of finished surface. Membrane and substrate must have 100 percent adhesive coverage. Avoid globs or puddles of adhesive.

Do not apply bonding adhesive to the splice area.

Do not allow adhesive to come into contact with areas that will be hot air welded. If contamination occurs, remove any contaminates prior to hot air welding seams.

Allow adhesive to dry to the point that it feels tacky to the touch but does not transfer to a clean, dry finger when you conduct a "push" test. DO NOT ALLOW TO OVER DRY.

If the surface dries to the point that it no longer feels tacky, reapply bonding adhesive to both surfaces at the prescribed application rate, and allow to flash-off again to the proper drying condition.

Roll the adhesive-coated membrane onto the adhesive-coated substrate, avoiding wrinkles.

10.

Using a push broom and positive downward pressure, brush down the bonded half of the membrane sheet to achieve maximum contact.

11.

Fold back the un-adhered half of the sheet, and repeat bonding procedure.

12.

Apply adjoining sheets in same manner, lapping edges a minimum of 2-1/2 inches (63.50 mm).

13.

Any wrinkles found in the splice area or that impede the flow of water drainage must be cut out, laid flat, and repaired using TPO membrane and standard hot air seam welding procedures.

Seaming

Position the top membrane to overlap the bottom membrane by 2-1/2 inches (64 mm).

If seam area has become contaminated with dirt or debris, use a clean rag saturated with toluene or toluol and thoroughly clean an area on both sheets at least 4 inches (102 mm) wide. Change rags frequently to avoid depositing previously removed materials.

Using an approved automatic heat welding machine or hand held heat gun and steel roller, continuously weld the TPO sheets with a minimum 1-1/2 inch (38 mm) wide seam.

Special attention must be paid to areas where multiple layers (3 or more) of TPO field membrane come together (T-joints).

On 45 and 60 mil (1.52 mm) or Greater Membrane use a Permaweld TPO T-Joint Cover or a 4 inch (102 mm) round field cut of unreinforced flashing is at each T-joint.

After each seam has been welded and after it has cooled all welded seams must be manually checked for voids or seal deficiencies by probing the entire seam area with a dull cotter key extractor. In addition, destructive testing must be performed daily as specified under paragraph Field Quality Control.

All TPO membrane cut edges with exposed reinforcement scrim require an application of TPO Edge Sealant by the end of each workday. Failure to seal the raw membrane edge before moisture wicks into the scrim may result in an inferior hot air weld and a leak source.

Perimeter and Base Membrane Securement:

Provide additional membrane securement at roof perimeters, parapets, transitional walls and edges, deck angle changes in excess of 2 inches (50.80 mm) in 12 inches (304.80 mm) (including drain sump areas), all curb-type roofing penetrations, pipe-type penetrations greater than 12 inches (305 mm) in diameter, both sides of expansion joints and other areas where the membrane must be anchored to prevent movement, stress or damage to the roofing membrane.

Base attachment is required at each roof level, curb skylight, expansion joint and roof penetration over 12 inches (305 mm) in diameter or any angle change in slope or combined slopes that exceed 2 inches (50.80 mm) in 12 inches (304.80 mm).

Night Seal:

At the completion of each day's work, a watertight seal must be established at any loose edge of membrane with an appropriate sealant. Care must be used to guarantee that no water flows beneath any completed sections of roof.

Membrane contaminated with the sealant used as a night seal must be cut out and discarded prior to resumption of work.

** NOTE TO SPECIFIER ** Tie-ins to built-up (BUR) or any other type of roof system and flashings terminated to intermediate elements are not covered by ERSystems warranties. Wood nailers are not covered by ERSystems warranty. Pre-molded inside and outside corners must be used for all corner flashing details on total system warranties. Consult ERSystems Technical Service for additional requirements.

3.10

MECHANICALLY FASTENED MEMBRANE INSTALLATION

Install in accordance with roof membrane manufacturer's instructions and the approved shop drawings.

Positioning Membrane:

Position the Permaweld TPO membrane over the approved substrate without stretching.

Allow the membrane to relax a minimum of 1/2 hour prior to any seaming or flashing.

Position all adjoining sheets in a manner that all sheets overlap a minimum of 4-1/2 inches (114 mm).

** NOTE TO SPECIFIER ** The seaming methods available for TPO mechanically fastened roof systems are single weld and dual weld. The significant difference between the two types of hot air welded seams is the way they distribute wind load from the roofing membrane sheet to the anchoring assemblies in the structural roof deck.
The required seaming method for the TPO mechanically fastened roof system is determined by the following factors: design codes and approvals on the specified roof system; width of the roofing sheets being installed; warranty and wind speed being sought for the project. Select single weld or dual weld seaming from the following paragraphs as required for the project and delete the one not required Consult ERSystems Technical Service for additional requirements.

Single Weld Seaming

Fold sheet back so underside of the seam area of the sheet is exposed. Be sure the sheet fold is smooth with no wrinkles or buckles.

Fold back the top sheet and position the ERSystems seam plate on the appropriate dots that have been applied at 6 inches (152 mm) intervals to the seam area of the bottom sheet.

Fasten with ERSystems fasteners following the appropriate fastener spacing.

Using an approved automatic heat welding machine or hand held heat gun and steel roller, continuously weld a minimum 1-1/2 inches (38 mm) wide seam.

Special attention must be paid to areas where multiple layers (3 or more) of TPO field membrane come together (T-joints).

On 45 and 60 mil (1.52 mm) or Greater Membrane use a Permaweld TPO T-Joint Cover or a 4 inch (102 mm) round field cut of unreinforced flashing is at each T-joint.

** NOTE TO SPECIFIER ** The dual weld seam configuration distributes an even, bidirectional load on the anchor bar seam anchoring system. This results in a higher wind load tolerance than the unidirectional load applied to the seam plate anchoring system used in the single weld assembly.

Dual Weld Seaming

Fold sheet back so underside of the seam area of the sheet is exposed. Be sure the sheet fold is smooth with no wrinkles or buckles.

Fold back the top sheet, and position ERSystems metal or polymer anchor bar in center of the seam, directly over the fully adhered line of the bottom sheet using only ERSystems fasteners.

Care must be taken when placing the bar where there are no factory line markings.

Fasteners must be located precisely 2 inches (51 mm) in from the edge of the top sheet. This alignment will provide a 1-1/2 inch (38 mm) weld area past the bar. Too much material overlap may result in a non-welded seam, requiring the seam to be repaired.

** NOTE TO SPECIFIER ** Contact the ERSystems Technical Department for anchor bar overlap requirements on FM projects.

All bars are to be overlapped and secured with a common screw.

Using an ERSystems approved automatic welder modified for dual weld applications, continuously weld a minimum 1 inch to 1-1/4 inch (25.5 mm to 32 mm) wide weld on both sides of the ERSystems metal or polymer anchor bar in the seam.

10.

Special attention must be paid to areas where multiple layers (3 or more) of TPO field membrane come together (T-joints).

11.

On 45 and 60 mil (1.52 mm) or Greater Membrane use a Permaweld TPO T-Joint Cover or a 4 inch (102 mm) round field cut of unreinforced flashing is at each T-joint.

12.

When welding stops and starts in a double weld seam, a dual weld must be achieved by using a hand held welder.

13.

Hot air equipment, approved by ERSystems and designed for use in dual weld seaming, will track over the anchor bar, welding on both sides. It is important that the operator maintain a visual check to make sure the machine is not riding on the anchor bar. Proper alignment of the anchor bar in the seam area is critical to achieve minimum 1 inch (25.5 mm) welds on both sides of the bar.

14.

Hot air flow between the dual welds will cause a slight rise in the material over the anchor bar, indicating that a weld has been achieved on both sides of the anchor bar. This condition will diminish over time.

15.

16.

** NOTE TO SPECIFIER ** ERSystems offers several different types of attachment methods. Perimeter securement must conform to the standard details offered by ERSystems. Consult ERSystems Technical Service for additional requirements.

Perimeter and Base Membrane Securement:

Night Seal:

Membrane contaminated with the sealant used as a night seal must be cut out and discarded prior to resumption of work.

** NOTE TO SPECIFIER ** ERSystems offers numerous options for flashing. See our standard details. Consult ERSystems Technical Service for additional requirements.

3.11

FLASHINGS

General: Roof perimeter flashing and flashing around vents, skylights and miscellaneous roof projections must utilize Permaweld Pre-molded TPO Flashings to the greatest extent possible. Field fabricated detail flashings using unreinforced TPO flashing are acceptable only when a pre-molded flashing is unfeasible, such as on pipes without top access.

Vertical Membrane Flashings: Wall, parapet, and/or curb flashings may be completed using standard Permaweld TPO membrane equal in gauge (thickness) to the deck membrane.

Complete seams between the flashing membrane and the field membrane according to ERSystems hot air welding procedures.

Stir Permaweld TPO Bonding Adhesive thoroughly to achieve a uniform mix with no marbling and no sediment on the bottom of the pail. DO NOT THIN.

Apply Permaweld TPO Bonding Adhesive to both the flashing material and the vertical substrate to which it is being bonded at a coverage rate of approximately 60 sf/gal (1.47 sm/L) of adhesive.

Allow adhesive to flash-off until the surface of the adhesive-coated membrane flashing feels tacky but does not transfer to a clean dry finger or "slide" when a push test is performed.

Roll the prepared flashing membrane tightly into the angle change and up the vertical substrate without wrinkles, creases or trapped air while smoothing the flashing to the substrate with a sweeping motion of your hand to promote a positive bond. NOTE: DO NOT allow flashing membrane to bridge at the deck to vertical substrate junction.

Once the flashing has been preliminarily bonded to the vertical substrate by hand, sweep the flashing material with a medium-stiff bristle broom to finish the bonding process.

Terminate top edge of flashing in accordance with ERSystems standard TPO details.

Flashing penetrations passing through the roofing membrane.

Flash all pipe penetrations with Permaweld TPO pre-molded pipe boots to the greatest extent possible. Field fabricate pipe flashings with Permaweld TPO Unreinforced Flashing in accordance with ERSystems standard details when a pre-molded flashing is not feasible.

** NOTE TO SPECIFIER ** Expansion Joints and Building Control Joints details must conform to the standard details offered by ERSystems. Consult ERSystems Technical Service for additional requirements.

Expansion Joints and Building Control Joints.

** NOTE TO SPECIFIER ** Pitch pans are not recommended. Consult ERSystems Technical Service for additional requirements.

Pitch Pans.

Roof Drains

Roof drains are specified in Section 15160. Provide approved roof drains for proper installation in conformance with ERSystems standard details.

Prepare substrate around each roof drain to prevent membrane bridging or distortion and to provide a smooth transition from the roof surface to the drain clamping ring.

The surface between the clamping ring and the drain must be clean and smooth. Remove all existing flashing, cement or lead on retrofit projects down to bare clean metal.

Apply one complete tube of Water Cut Off between drain bowl compression flange and the underside of the new membrane before compressing the new membrane to drain bowl assembly, with the compression ring mounted on the top surface of the new membrane. The detail is only complete when the Water Cut Off is fully compressed between the new membrane and the flange of the drain bowl, forming a solid seal between the two.

Be careful to compress the assembly evenly to avoid cracking or breaking the drain compression ring. Cracked or broken drain compression rings must be replaced immediately.

All bolts and/or clamps must be in place in order to provide constant, even compression.

Do not run seams through roof drains or sumps. If a seam is run through a drain sump, cut the membrane with the assembled seam outside of the drain compression ring area, and install a target patch of new membrane extending a minimum of 3 inches (76 mm) outside of the sump area and seamed into the field membrane using ERSystems standard seam tape seaming procedures. Apply T-joint covers as required at the target patch to seam intersections in accordance with ERSystems standard T-joint application procedures.

** NOTE TO SPECIFIER ** Metal work must be secured in a manner approved by ER Systems and/or in accordance with FM I-49 and SMACNA guidelines to prevent damage from buckling, or wind exposure. All metal work that is part of the waterproof envelope must be sealed, structurally sound, and appropriately anchored to prevent leakage.

Unless specifically agreed to in writing prior to installation, metalwork is not included in the ERSystems warranty coverage. Any request for inclusion of metalwork in warranty coverage must accompany the Pre Notification form via a deviation request. The deviation request must include shop drawings of the metalwork that the request is based upon as well as a roof plan showing the installed location and linear dimension for each profile.

To be considered for warranty coverage, the following minimum requirements must be met: metalwork material is 24 gauge (0.61 mm) G-90 Kynar pre-finished steel or 0.040 inch (1.02 mm) aluminum (mill finished, pre-finished or anodized); the proposed fabrication as shown on the submitted shop drawings complies with SMACNA and NRCA recommendations for the specific configuration submitted; installation securement is clearly defined on the shop drawings, e.g. fastener type and spacing, cleat type, etc.

Approval of metalwork for inclusion in warranty coverage is conditional and subject to the "terms, conditions and limitations" of the requested warranty if approved and may involve an additional fee (warranty up-charge per square foot). Consult ERSystems Technical Service for additional requirements.

Metalwork

Sheet Metal Flashing and Trim are Specified in Section 07620.

Install all edge termination to prevent water infiltration into the roofed structure including coping caps, gravel stops, roof edging, flashing and counter-flashing components as indicated on the Drawings.

All flange-mounted metalwork must be flashed according to the appropriate ERSystems detail.

Roofs with gravel stop configuration metal work (formed dam capable of holding water) with a TPO Cover Tape flange strip-in of metalwork must have edge caulk applied on the dam side of the cover tape to aid in sealing the seam against trapped water.

** NOTE TO SPECIFIER ** Walkways are required at all access points to the roof system and recommended anywhere routine (routine is defined as once a month or more) traffic on the membrane surface is anticipated. Walkway pads are used to protect the weatherproofing membrane from damage or excessive wear and tear. Traffic-related roof damage is not covered by the ERSystems warranty.

In areas of extreme traffic, contact ERSystems for options to enhance the roof system in order to prevent or mitigate traffic-related insulation damage. Walkway maintenance is the responsibility of the building owner because walkway pads are not part of the warranted waterproofing assembly. Consult ERSystems Technical Service for additional requirements.

3.12

WALKWAYS

Provide roof walkways in the location indicated on the Drawing.

Membrane shall be clean and dry. Remove any visible dirt and debris.

Position walkway roll and cut to desired length.

Walkway shall not cover seams. Walkway roll shall be kept a minimum of 2 inches from the edge of the seam on the bottom sheet of the completed lap and a minimum of 6 inches (152 mm) from the edge of the seam when located on the top sheet of a completed lap.

Weld perimeter of walkway roll to the membrane following standard welding procedures. Spaced 2 inches (51 mm) long "weep" breaks in the weld seam are required on the low slope edge of the pad to prevent the accumulation of water under the pad.

** NOTE TO SPECIFIER ** Field Quality Control testing is required for all ERSystem Warranties. Testing must conform to the requirements of ERSystems. Consult ERSystems Technical Service for additional requirements.

3.13

FIELD QUALITY CONTROL

Destructive tests shall be performed at the beginning of every workday and every time there is any interruption in the welding process. (i.e. Power failure, welder shut down, change in job site conditions, or after lunch). All deficiencies must be repaired immediately.

Destructive test shall be performed on a minimum 3 inch (76 mm) wide area of seam weld to verify sufficient peel strength. Verify seam strength and correct procedures and seams that do not provide watertight durable construction.

A properly welded seam will have membrane delamination from scrim prior to weld failure.

Destructive tests on welds shall be conducted for the first seam of the day, the first seam after the robot welder has been allowed to cool down, and after any extreme changes in weather conditions.

Upon completion of the installation, an inspection will be performed by a representative of the roofing manufacturer to ascertain that the roofing membrane system has been installed according to ERSystems approved specifications and details.

3.14

PROTECTION

Protect installed products until completion of project.

Repair or replace damaged products before Substantial Completion.

Repair all damage to the system in accordance with ERSystems specifications prior to final inspection for warranty approval.

3.15

CLEAN-UP

All debris, containers, materials, equipment, and protection materials must be removed from the premises or properly disposed of pending the owner's approval.

All work and storage areas must be in an undamaged and acceptable condition upon completion of clean-up.

END OF SECTION