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SECTION 07533

THERMOSET MEMBRANE ROOFING (CSPE)

** NOTE TO SPECIFIER ** Dow Roofing Systems; single ply roofing systems.
.
This section is based on the products of Dow Roofing Systems, which is located at:
9 Sullivan Rd.
Holyoke, MA 01040-2800
Toll Free Tel: 866-583-2583
Tel: 413-533-8100
Email: request info
Web: www.dowroofingsystems.com
[ Click Here ] for additional information.
Dow Roofing Systems is a leading global provider of thermoplastic roofing membranes, and the inventors of reinforced thermoplastic polyolefin (TPO) roofing membrane. We manufacture and market some of the most technically advanced commercial roofing materials available on the market today. In fact, since the early 1980s, Dow has become the specified choice for building owners, architects, specifiers and roofing contractors in the world for both new construction and re-roofing applications.
Since 1985, Dow Roofing Systems has been a leading industry advocate of the benefits associated with white reflective roofing. Dow has authored many articles on the benefits of white reflective roofing, and a Charter member of the EPA Energy Star Roof Products Program, and a member of the Cool Roof Rating Council. Dow Roofing products can also contribute to LEED® points for your building. We ate dedicated to providing products that will not only be guaranteed for their quality but also guaranteed to be environmentally friendly.

PART 1

GENERAL

1.1

SECTION INCLUDES

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

Mechanically attached thermoset (CSPE) roof membrane systems including insulation, roof edge and accessories.

Fully adhered thermoset (CSPE) roof membrane systems including insulation, roof edge and accessories.

Ballasted thermoset (CSPE) roof membrane systems including insulation, roof edge and accessories.

Protected roof membrane ballasted thermoset (CSPE) roof membrane systems including insulation, roof edge and accessories.

Vented thermoset (CSPE) roof membrane systems over monolithic decks including insulation, roof edge and accessories.

1.2

RELATED SECTIONS

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

Section 06100 - Rough Carpentry: For nailers and roof assembly support.

** NOTE TO SPECIFIER ** Metal work other than Dow Edge Metal Systems is not covered by Dow for Warranty. Metal work must be secured in a manner approved by Dow and/or in accordance with SMACNA guidelines to prevent damage from buckling, or wind exposure. All metal work that is part of the waterproofing envelope must be sealed, structurally sound, and appropriately anchored to prevent leakage.

Section 07620 - Sheet Metal and Trim.

1.3

REFERENCES

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

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

ASTM D 312 - Standard Specification for Asphalt Used in Roofing.

ASTM D 5019 - Standard Specification for Reinforced Non-Vulcanized Polymeric Sheet Used in Roofing Membrane.

1.4

SUBMITTALS

Submit under provisions of Section 01300.

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

Samples and data sheets of materials with approval by manufacturer of all materials not supplied by roofing manufacturer.

Preparation instructions and recommendations.

Storage and handling requirements and recommendations.

Installation methods.

Shop Drawings:

Outline and size of the roof, location and type of penetrations, perimeter and penetration flashing detail references to manufacture's standard. Details which do not conform to roofing manufacturer's standards shall be identified with separate approval from roofing manufacturer. Details to be employed on the project shall be approved by roofing manufacturer.

Warranty Certification:

Submit warranty certification from manufacturer of approval of project design and intent to issue warranty.

** NOTE TO SPECIFIER ** For mechanically fastened roof systems over gypsum, cementitious woodfiber decks ("Tectum") and light-gauge metal panel roofs. Delete if not required.

Fastener pull tests from an independent testing agency shall be approved by the roofing manufacturer.

** NOTE TO SPECIFIER ** Delete if stone ballasted system not required.

Stone ballast analysis from an independent testing agency shall be approved by the roofing manufacturer.

** 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.

1.5

QUALITY ASSURANCE

** NOTE TO SPECIFIER ** Include manufacturer qualifications. Delete if not required.

Manufacturer Qualifications:

Installer Qualifications:

Roofing contractor shall be authorized by Dow to install assembly.

Material Qualification:

Membrane shall be classified by Underwriters Laboratories as a Class A sheathing material for use in construction of Class A roofing assemblies. Shall meet all test requirements for FM Global (FMG) Class 1A fire and wind resistance.

** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.

Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.

Finish areas designated by Architect.

Do not proceed with remaining work until workmanship, color, and sheen are approved by Architect.

Refinish mock-up area as required to produce acceptable work.

1.6

DELIVERY, STORAGE, AND HANDLING

** NOTE TO SPECIFIER ** Paver ballasted systems only. Delete if not required.

Pallets of paver ballast may be stored on the ground in a secure area. If placed on the roof, the load shall not exceed the structural capacity of the deck or crushing resistance of the insulation.

Packaging shall bear the UL label.

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

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

1.7

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.

** NOTE TO SPECIFIER ** Metal work other than Dow Edge Metal Systems is not covered by Dow for Warranty. See General Warranty section on the Dow Technical Manual CD-Rom for more information. Refer to Appendix E, Additional Requirements for Dow 20-year Warranty Systems.

1.8

WARRANTY

A manufacturer's representative shall inspect the installation for compliance with manufacturer's standards upon completion of the roofing system.

Deviations or changes from the contract specification shall have written approval from the roofing manufacturer, for presentation to Architect at completion of roofing system.

** NOTE TO SPECIFIER ** Refer to Appendix E, Additional Requirements for Dow 20-year Warranty Systems. Delete if not required.

Standard System Warranty: will be issued upon acceptance of the roofing system installation.

** NOTE TO SPECIFIER ** Delete warranty period not required.

Five (5) year period that covers wind damage up to 70 mph (113 k/hr).

Ten (10) year period that covers wind damage up to 70 mph (113 k/hr).

** NOTE TO SPECIFIER ** Not available for VRS System. Delete if not required.

Fifteen (15) year period that covers wind damage up to 70 mph (113 k/hr).

** NOTE TO SPECIFIER ** Refer to Appendix E, Additional Requirements for Dow 20-year Warranty Systems. A warranty of up to 120 mph (194 k/hr) design wind speed is available with Dow Paver Ballast System upon approval by Dow Technical Review Dept. Delete if not required.

** NOTE TO SPECIFIER ** Not available for VRS System. Delete if not required.

Total System Warranty: will be issued upon acceptance of the roofing system installation.

** NOTE TO SPECIFIER ** Delete warranty period not required.

Five (5) year period that covers wind damage up to 70 mph (113 k/hr).

Ten (10) year period that covers wind damage up to 70 mph (113 k/hr).

Fifteen (15) year period that covers wind damage up to 70 mph (113 k/hr).

PART 2

PRODUCTS

2.1

MANUFACTURERS

Acceptable Manufacturer: Dow Roofing Systems, which is located at: 9 Sullivan Rd. ; Holyoke, MA 01040-2800; Toll Free Tel: 866-583-2583; Tel: 413-533-8100; Email: request info; Web: www.dowroofingsystems.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.

2.2

MATERIALS

Membrane shall be Dow Cimarca CSPE membranes as manufactured by Dow Roofing Systems.

Membrane: ASTM D 5019 for CSPE and PIB based roofing membranes.

Color: White.

** NOTE TO SPECIFIER ** Delete one of the following two paragraphs.

Thickness and Sheet Width: 0.045 inch (1.15 mm) nominal thickness overall, scrim-reinforced, uncured CSPE-based sheet 76.5 inches (1943 mm) wide.

Thickness and Sheet Width: 0.060 inch (1.50 mm) nominal thickness overall, scrim-reinforced, uncured CSPE-based sheet 76.5 inches (1943 mm) wide.

Perimeter Sheet: Membrane with a sheet width of 38.25 inches (972 mm).

Flashing shall be .045 inch (1.15 mm) thick membrane for walls and curbs regardless of roof cover sheet thickness.

Unreinforced .055 inch (1.4 mm) membrane shall be supplied for field-fabricated details not required to be factory formed or membrane laminated metal.

Related Materials and Accessories:

Bonding Adhesive: Dow Cimarca CSPE Bonding Adhesive shall be used for bonding all Dow Cimarca CSPE membranes and flashing membranes to wood, metal, masonry, and approved roof insulation board surfaces.

All-Purpose Sealant: Dow All-Purpose Sealant shall be used for a water cutoff mastic, sealant to top off pitch boxes, and as an exterior grade caulk for metal work.

All Weather Primer/Seam Caulk: Dow Cimarca CSPE All-Weather Primer/Seam Caulk is a solvent-based primer developed to reactivate cured Dow Cimarca CSPE membranes (when used in conjunction with Dow Cimarca CSPE Solvent) in preparation for hot-air welding and also used to seal exposed cut edges of reinforced membrane.

Solvent: Dow Cimarca CSPE Solvent has been developed for initial reactivation of partially cured Dow Cimarca CSPE membranes in preparation for hot-air welding, and used in conjunction with Dow Cimarca CSPE All-Weather Primer/Seam Caulk for rewelding cured Dow Cimarca CSPE membrane.

Insulation Adhesives: Dow Insulation Adhesive is a VOC-free, one-part, rising, moisture-cure foam adhesive and shall be used for bonding most insulation and recover boards to most flat roofing decks. Dow-OlyBond 500 and Dow-OlyBond Classic are dual component, rising, chemical cure polyurethane adhesives that are ribbon or spray applied and shall be used for bonding most insulation and recover boards to most flat roofing decks.

Termination bar: Dow Termination Bar shall be fastened 6 inches (152 mm) o.c.

Edge Metal Systems: Dow Edge Metal shall be installed per standard DR details.

Roof walkways: Dow Walkway Roll adhered to the membrane where indicated or required for warranty.

Prefabricated Pipe Boots: Shall be used for vent stacks and pipes 1 inch (25 mm) to 6 inches (152 mm) diameter.

10.

Prefabricated Corners: Shall be used for flashing for use at outside and inside corners.

11.

Slip Sheet: Medium to heavy weight (6 oz (170 g) or heavier) nonwoven polyester fabric.

12.

Flashing Tape: Shall be used for stripping-in gravel stop and drip edge metal.

** NOTE TO SPECIFIER ** Vented Roof System Only. Delete if not required.

13.

VRS Air Valves: Shall be supplied by Dow.

14.

** NOTE TO SPECIFIER ** Refer to Appendix A, Dow Fastener Selection guide and Appendix HY-C, Fastening Requirements for Mechanically Attached CSPE Roofing Systems to select appropriate fastener/plate combination and approved fastening rates. Also, Dow [ www.arcat.com/arcatcos/cos35/arc35774.cfm Product Data ]sheets can found on the Dow Technical Manual CD-Rom.

Fasteners: Fastener type, length and pull-out resistance shall be approved by roofing manufacturer as supplied by roofing manufacturer.

** NOTE TO SPECIFIER ** Delete if not required.

Stone Ballast:

Round washed stone in gradation size required for exposure criteria shall be used.

Paver Ballast:

Pavers shall not exceed 60 lb (27 kg) each or exceed the compressive strength of the insulation board or substrate.

Unit weight: 12 lb/sf (59 kg/sm).

Bearing Surface: 30 sq. inches/sf (21 percent of paver area).

** NOTE TO SPECIFIER ** Delete color not required.

Standard Color: Gray.

Custom Color: Refer to drawings.

Paver Connectors/Adhesives: Shall be used to connect one paver unit to another as required by enhancement details and the use of cut-to-fit paver units.

Metal for Paver Securement: Shall be required for paver perimeter areas.

Perimeter attachment shall extend a minimum of 2 inches (51 mm) across the top horizontal surface of the pavers. This flange shall sit tightly against the top surface of the pavers. Unless otherwise required by project design, metal terminations shall be designed and secured to provide an uplift resistance of at least 100 pounds per linear foot (149 kg/m). Size and spacing of fasteners will depend upon fastener and substrate type but in no condition shall fastener or anchor spacing exceed 12 inches (305 mm) o.c.

** NOTE TO SPECIFIER ** A warranty of up to 120 mph (194 km/hr) design wind speed is available with Dow Paver Ballast System upon approval by Dow Technical Review Dept. Delete Dow Paver Ballast if not required.

The Dow Paver Ballast System shall consist of products from a Dow-approved paver manufacturer.

System design and schematic layout of paver system shall be supplied by Dow upon review of individual projects qualifying for the Dow Paver System warranty.

The Dow Paver Ballast System shall consist of shiplap interlocking concrete ballast pavers that have been designed specifically for ballasting loose-laid roofing systems. The pavers shall provide for four-way drainage. Only accessories supplied or approved by the roofing manufacturer for the paver ballast system are acceptable

** NOTE TO SPECIFIER ** Insulation or protection boards other than those referenced in Appendix MA-A or FA-B must be accepted in writing by Dow. Insulation/underlayment/recover board: Dow supplies a wide range of insulations, underlayments and coverboards to satisfy a broad spectrum of design conditions. Only Dow brand insulation products will be eligible for Total System Warranty coverage; products other than Dow will incur a premium warranty fee. (Reference Appendix MA-B, Dow Approved Insulation List and Fastening Rates for Mechanically Attached Systems) Delete insulation not required.

2.3

INSULATION

Dow Termico Polyisocyanurate Insulation: Closed-cell HCFC FREE "Green" polyisocyanurate foam core manufactured using ACUltra Hydrocarbon blowing agent and integrally laminated to heavy non- asphaltic fiber-reinforced felt facers. Available in flat stock and tapered panels.

** NOTE TO SPECIFIER ** Delete compressive strength not required.

Compressive strength: 20 psi (138 kPa).

Compressive strength: 25 psi (172 kPa).

Dow ISO 3000: Closed-cell HCFC FREE "Green" polyisocyanurate foam core manufactured using ACUltra Hydrocarbon blowing agent and integrally laminated to heavy coated-glass facers.

** NOTE TO SPECIFIER ** Delete compressive strength not required.

Compressive strength: 20 psi (138 kPa).

Compressive strength: 25 psi (172 kPa).

Dow ISO Recover Board: Closed-cell HCFC FREE "Green" polyisocyanurate foam core manufactured using ACUltra Hydrocarbon blowing agent and integrally laminated to heavy coated-glass facers with a compressive strength of 20 psi (138 kPa).

Dow extruded polystyrene (XPS): Extruded polystyrene closed-cell foam panel with continuous skin on face and back surface that meets ASTM C-578, Standard Specification for Rigid Cellular Polystyrene Thermal Insulation.

Dow expanded polystyrene (EPS): - ASTM C578 expanded polystyrene thermal rigid board insulation with a minimum density of 1.25 lb/cf (20 kg/cm).

** NOTE TO SPECIFIER ** Refer to Dow Product Specification Data Sheets for additional information. Delete if not required.

DensDeck Roof Boards:

** NOTE TO SPECIFIER ** Delete roof board and thickness not required.

G-P Gypsum Corporation: Nonstructural, glass mat faced gypsum panel with water-resistant core. 1/4 inch (6 mm) DensDeck Roof Board.

G-P Gypsum Corporation: Nonstructural, glass mat faced gypsum panel with water-resistant core. 1/2 inch (13 mm) DensDeck Roof Board.

G-P Gypsum Corporation: Nonstructural, glass mat faced gypsum panel with water-resistant core. 5/8 inch (16 mm) DensDeck Type X Roof Board.

** NOTE TO SPECIFIER ** Delete roof board and thickness not required.

G-P Gypsum Corporation: 1/4 inch (6 mm) DensDeck Prime Roof Board. Glass mat faced gypsum with non-asphaltic, highly filled proprietary heat-cured coating on one side.

G-P Gypsum Corporation: 1/2 inch (13 mm) DensDeck Prime Roof Board. Glass mat faced gypsum with non-asphaltic, highly filled proprietary heat-cured coating on one side.

G-P Gypsum Corporation: 5/8 inch (16 mm) DensDeck Prime Roof Board Type X. Glass mat faced gypsum with non-asphaltic, highly filled proprietary heat-cured coating on one side.

** NOTE TO SPECIFIER ** Delete roof board and thickness not required.

G-P Gypsum Corporation: 1/4 inch (6 mm) DensDeck DuraGuard,. Glass mat faced gypsum panel with blue low-perm, durable, integrated-coating on one side and coated glass mat on the back.

G-P Gypsum Corporation: 1/2 inch (13 mm) DensDeck DuraGuard. Glass mat faced gypsum panel with blue low-perm, durable, integrated-coating on one side and coated glass mat on the back.

G-P Gypsum Corporation: 5/8 inch (16 mm) DensDeck DuraGuard. Glass mat faced gypsum panel with blue low-perm, durable, integrated-coating on one side and coated glass mat on the back.

PART 3

EXECUTION

3.1

EXAMINATION

Do not begin installation until substrates have been properly prepared.

Nailers and blocking shall be installed level, true to line and elevation, secured to roof structure to resist roof installation and service conditions. Refer to Section 06100.

Reroofing: Use #2 or better wood treated for rot resistance. Creosote and asphaltic preservatives are not acceptable.

New roofing: As specified by Architect. A pressure preservative treated wood nailer is recommended. Effective perimeter attachment must be achieved per details.

All construction: Nailer shall be anchored with a suitable fastener for the application having a minimum withdrawal resistance of 100 lb (45 kg), staggered 6 inches (152 mm) o.c. within 8 ft (2.4 m) of an outside corner and 12 inches (304 mm) o.c. along other perimeter areas.

All construction: Nailer thickness shall be chosen to match the top surface of adjacent construction 1/4 inch (6 mm). This permissible variation shall not contribute to ponding.

Nailers around skylights, curbs, expansion joints, and similar items, are not required. Use of Dow Plates and Screws anchored to deck 12 inches (304 mm) o.c. through membrane and insulation is acceptable.

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

3.2

PREPARATION

Adhesives, solvents, and caulks as indicated are extremely flammable and/or toxic. Follow precautions indicated on container or packaging labels.

Surfaces to be bonded shall be dry, clean and free of debris. Suitable surfaces are usually considered to be smooth: solid masonry, wood, and metal, plus insulation boards fastened per the specific manufacturer's recommendations for receiving adhered roofing membranes and accepted by Dow for adhered applications of Dow Cimarca CSPE membrane.

All fasteners should be installed with a depth-sensing screw gun to prevent overdriving or under driving. The ASAP and PIF adapter tools are recommended for installing Dow ASAP and Dow PIF Fasteners.

Block off or shut down positive pressure building ventilation systems during application to prevent sheet from billowing during application.

Consideration should be given in the project design to potential safety problems that can precipitate from the smooth surface characteristic of the Dow Cimarca CSPE sheet. The membrane surface becomes slippery when wet. If access to roof is required, walkway surfaces are highly recommended. In northern climates, sliding snow could create a hazard below and adjacent to the perimeter if a retarding system is not installed on roofs with slopes greater than 2-in. per foot (170 mm/m).

Job specification and retrofit preparation should always include provisions to ensure positive drainage in all areas. Good roofing practice does not permit uncontrolled, uncollected drainage over the edge of a roof.

All rooftop mechanical units are to have their condensation lines piped to drains, or off the roof.

Grease shall not be allowed to accumulate on the roof. If rooftop grease units do not receive continual maintenance they are to have an approved grease containment system specified.

At the discretion of Dow, excessive patching as a result of damage to the Dow Cimarca CSPE membrane, or caused by faulty installation, may require total recover in those areas.

For buildings with canopies or large wall openings, e.g. hangar doors and truck entrances or docks, which are subject to positive pressurization from wind, or from air handling systems, consult Dow for suitability of application and possible design enhancement requirements.

Provide temporary ballast in partially completed sections to control wind effects during construction.

After exposure to sunlight for 24 hours or longer, Dow Cimarca CSPE membrane may have achieved a "surface" curing. Prior to hot-air welding, an application of Dow Solvent in conjunction with Dow Primer is required to achieve a proper weld.

** NOTE TO SPECIFIER ** Vapor retarder: Is not required for protection of Dow Roofing System membrane. As a guideline, the National Roofing Contractors Association states, "...vapor retarders should be considered for use when both of two conditions are anticipated: (1) the outside mean, average January temperature is below 40 degree F (4.4 degree C), and (2) the expected winter, interior relative humidity is 45 percent or greater."

** NOTE TO SPECIFIER ** Steel deck, wood plank and lightweight cementitious decks: Shall be covered with an approved insulation mechanically fastened or adhered to the deck with Dow approved product (Reference Appendix MA-B, Approved Insulation List & Fastening Rates). Polystyrene boards may require a thermal barrier underlayment over steel decks. Consult manufacturer and local building codes. Delete deck type not required.

Steel Deck:

Shall be covered with an approved insulation mechanically fastened or adhered to the deck.

** NOTE TO SPECIFIER ** Vented roof assembly only. Delete if not required.

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

Wood Plank:

Shall be covered with an approved insulation mechanically fastened or adhered to the deck.

** NOTE TO SPECIFIER ** Vented roof assembly only. Delete if not required.

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

Lightweight Cementitious Decks:

Shall be covered with an approved insulation mechanically fastened or adhered to the deck.

** NOTE TO SPECIFIER ** Concrete, plywood, or flat sheet-metal surface: Plywood must be exterior grade with an A or B finish side up and with no joints gapped greater than 1/4 inch (6 mm). Consideration should be given to installing slip plates over all gapped or uneven joints where membrane seams will cross to minimize welding inconsistency. Thickness, structural grade, fastening, and fire resistance requirements should meet the requirements and recommendations of applicable building codes and the APA and are the responsibility of the owner and the installer. The membrane shall have a fastened expansion joint detail (as per standard DR Detail Drawings) where deck joints exceed 1/4 inches (6 mm) or when crossing a building expansion joint. Delete deck type not required.

Concrete Deck:

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

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

Plywood Deck:

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

** NOTE TO SPECIFIER ** Vented roof assembly only. Delete if not required.

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

Flat Sheet-Metal Surface:

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

** NOTE TO SPECIFIER ** Reroofing over existing roof: The specifier and/or applicator shall determine the condition of the existing roof. Significantly deteriorated decking must be repaired or replaced, as appropriate. Wet materials (containing free moisture that would evaporate if exposed to atmosphere) must be found and replaced.

Reroofing Over Existing 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.

** NOTE TO SPECIFIER ** Protected roof membrane assembly requirement only. Delete if not required.

Ponding at the membrane level shall be corrected by improved drainage design as required to eliminate "birdbathing" to less than 4 square feet (.37 square meters), less than 1/2 inch (13 mm) deep areas.

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

3.3

INSTALLATION

Provide temporary ballast in partially completed sections to control wind effects during construction.

** NOTE TO SPECIFIER ** Certain insulation types such as polystyrene are not compatible with coal tar pitch. Contact insulation manufacturer for recommendations. Certain polystyrene insulation boards are not suitable for use directly under certain colors of Dow Cimarca CSPE membrane and require an overlayment (Reference Appendix MA-B, Approved Insulation List and Fastening Rates).

In regard to attachment, compatibility and spanning metal flutes, the manufacturers' instructions or specifications shall determine the suitability for an application, subject to acceptance by Dow. For Total System Warranty applications, insulation plates and fasteners must be supplied by Dow (Reference Appendix MA-B, Approved Insulation List & Fastening Rates). Delete if not required.

Insulation Installation:

** NOTE TO SPECIFIER ** Ballasted assembly option. Delete if not required.

Insulation boards shall be installed loose-laid with the longest dimension perpendicular to the direction of the membrane seams whenever possible. End joints should be staggered and boards will be butted as closely as possible with no gaps over 1/4 inch (6 mm).

Maximum width of insulation joints shall be 1/4 inch (6 mm), and the difference in height of adjacent insulation sheets shall not exceed 1/4 inch (6 mm). Surface irregularities, membrane wrinkles, or similar conditions from uneven substrates that could prevent the interlocking of adjacent pavers shall be eliminated.

** NOTE TO SPECIFIER ** PRM only. Delete if not required.

Protected Roof membrane Assembly: Ballasting a protected membrane assembly where insulation is installed over the membrane.

Insulation products above membrane shall be designed for this type of application and exposure and be approved by the roofing manufacturer.

Provide a stone mat fabric between the top insulation and the ballast stone or units. The fabric must allow complete drainage.

** NOTE TO SPECIFIER ** Delete if not required.

Mechanical Attachment: Insulation boards shall be attached with FMG and manufacturer-approved insulation plates and fasteners.

** NOTE TO SPECIFIER ** As an alternative to mechanical attachment, Dow permits adhering insulation with Dow Insulation Adhesive and other approved insulation adhesives. The specific application must be approved in writing from the adhesive manufacturer and be approved by Dow Technical Review Dept. Delete if not required.

Adhered Insulation with Approved Adhesive: Installation requirements of the adhesive and insulation manufacturer shall be followed. Insulation boards shall be secured sufficiently to conform to the substrate surface geometry.

** NOTE TO SPECIFIER ** As an alternative to mechanical attachment, Dow permits adhering insulation with hot steep asphalt (ASTM D-312 Type III or IV). The specific application must be approved in writing from the insulation board manufacturer and be approved by Dow Technical Review Dept. All temperature requirements and application procedures must be followed. Insulation boards must be secured sufficiently to conform to the substrate surface geometry. Delete if not required.

Adhered Insulation with Asphalt: Adhere insulation with hot steep asphalt (ASTM D-312 Type III or IV). Temperature requirements and application procedures shall be followed. Insulation boards shall be secured to conform to the substrate surface geometry.

** NOTE TO SPECIFIER ** Delete if not required.

Tapered Insulation:

Tapered edge strip of high density fiberboard shall be used to provide a smooth transition to the flat areas.

Insulation boards shall be installed with the longest dimension perpendicular to the direction of the membrane seams whenever possible and installed with end joints staggered. Boards will be butted as closely as possible with no gaps over 1/4 inch (6 mm) and secured to substrate.

** NOTE TO SPECIFIER ** Delete Stone Ballasted Membrane Installation if not required.

For seacoast application, ASCE Exposure C and D, and buildings with large wall openings such as hangar doors or canopies, contact Dow Technical Review Dept.

1. For buildings up to 30 ft (9 m) high: 3/4 to 1-1/2 inch (19 mm to 38 mm) round washed stone shall be used. 10 pounds per sq. ft. (48 kg/sq. m) minimum weight shall be achieved. A minimum 2 inch (51 mm) high gravel stop shall be applied. Non-interlocking paver blocks are acceptable.

2. For buildings over 30 ft up to 50 ft (9 m to 15 m) high: 3/4 to 1-1/2 inch (19 mm to 38 mm) round washed stone shall be used. 13 pounds per sq. ft. (63 kg/sm) minimum shall be applied. A minimum 12 inch (305 mm) high parapet shall be used. Only interlocked pavers are acceptable.

3. For buildings over 50 ft up to 100 ft (15 m to 30 m) high: Nominal 2-1/2 inches (64 mm) round washed stone shall be used. (Use ASTM D-448 sizes 20 or 24 gradation). 17 pounds per sf (83 kg/sm) minimum shall be applied. A minimum 36 inches high continuous parapet shall be used. Only interlocked pavers are acceptable.

4. For buildings over 100 ft (30 m) high Only interlocked paver systems will be considered. Contact Dow in all cases.

Ballasted Membrane Installation:

Membrane shall be unrolled on the area to be covered, with the edge of the membrane overlapped to the alignment line on the previous sheet.

Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.

The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.

Cut edges shall be caulked by applying sealant.

** NOTE TO SPECIFIER ** Dow Cimarca CSPE is manufactured as an uncured CSPE-based sheet and by design will cure with extended exposure to sunlight and moisture. Poor storage conditions can also initiate the curing process. After one day of exposure the curing process begins, from the top surface down. Hot-air welding will be impossible after curing begins without first applying Dow Solvent to the cured surface. After more than one day of surface cure Dow Solvent and Dow All-weather Primer/Caulk must be applied to the cured surfaces.

Hot-air welding of exposed and cured membrane: Apply a 100 percent even coverage of primer/all weather caulk to both surfaces. Allow the primer to dry until tacky. Primer shall not be allowed to become dry for more than 20 minutes. If this occurs, reapply primer. Hot-air weld the two sheets of membrane together as required for uncured sheets.

At perimeters that are to receive a gravel stop or metal edging, the membrane shall be brought over the outside edge and terminated 12 inches (305 mm) o.c.

Membrane shall be mechanically attached 12 inches (305 mm) o.c. at all perimeters and at any penetration that has a dimension of 24 inches (610 mm) or greater with fasteners and plates.

** NOTE TO SPECIFIER ** Delete ballast type not required.

Stone Ballast: Ballast shall be sufficient to provide 100 percent coverage of membrane and satisfy wind uplift and exposure criteria.

Paver Ballast: Paver blocks with a rough surface or in high traffic areas require a protection sheet or board.

Paver ballast shall consist of full coverage of paver units.

Do not install pavers on fresh, uncured, caulking or sealants for the membrane and metal flashings. Allow the materials to cure to a nonstick surface condition prior to installing pavers.

A slip sheet shall be installed for areas having regular roof traffic.

A protective slip sheet and/or foam rod stock shall be set between paver units and membrane flashing where no other separator prevents direct contact.

** NOTE TO SPECIFIER ** For buildings less than 70ft (21 m) high in wind zones within ASCE Ground Roughness Categories A, B and C (Reference Table 2): two perimeter sheets shall be installed at all exterior roof perimeters that are not bordered by a parapet wall or an adjoining building a minimum of 24 inches (610 mm) higher than roof level. Perimeter sheet requirement pertains to any adjoining roof level 2 ft (610 mm) or greater above the main deck level. See special condition fastening variations for guidelines addressing more severe exposures (ASCE Ground Roughness category D) and buildings greater than 70 ft (21 m) high.

** NOTE TO SPECIFIER ** Dow published fastening rates and perimeter enhancement requirements are not necessarily consistent with the requirements of local building codes, FMG or similar agencies. Consult said agencies for their specific requirements when necessary or contact the Dow Technical Review Dept.

Fastening requirements: The following fastening requirements apply to membrane with widths of 76.5inches (1943 mm) or less and are applicable for minimum 3/4 inch (19 mm). plank/plywood, 22 gauge (.759 mm) steel or heavier and minimum 2500 psi (17.2 MPa) compressive strength structural concrete decks on buildings located within ASCE Ground Roughness Categories A, B and C (Reference Table 2, ASCE Exposure Classification Chart). For fastening rates and approved fastener and plate combinations for deck types not listed here refer to Appendix EV-C, Fastening Requirements for Mechanically Attached CSPE Roofing Systems.

Buildings up to 70 ft (21 m) high: Two 38.25 inches (972 mm) wide perimeter sheets, fastened 12 inches (305 mm) o.c., parallel to entire perimeter ("picture frame") Field sheets 18 inches (457 mm) o.c. Buildings over 70ft (21 m) to 110 ft (34 m) high: Perimeter sheets fastened at 12 inches (305 mm) o.c.* Field sheets 18 inches (457 mm) o.c..

Buildings over 110 ft (34 m) to 200 ft (61 m) high: Perimeter sheets fastened at 9 inches (229 mm) o.c.* Field sheets fastened 12 inches (305 mm) o.c. Buildings over 200 ft (61 m) to 350 ft (107 m) high: Perimeter sheets fastened at 6inches (152 mm) o.c.* Field sheets fastened 6 inches (152 mm) o.c. * Perimeter area shall be defined as the smaller of: 0.1 times the building lesser plan dimension. 0.4 times the eaves height.

Tall building specification notes: For buildings over 110 ft (34 m) high fasten around all projections over 12 inches (305 mm) in length or diameter at 9 inches (229 mm) o.c. Buildings that are sited on a high elevation relative to the surrounding area (Reference Table 2, ASCE Ground Roughness Category D) are subject to different fastening patterns (Contact Dow Technical Review Dept.).

Changes in parapet wall heights, fire walls, adjacent roof areas, and roof geometry affect wind exposure. Ensure that all such pertinent information is submitted to Dow for review before committing to a fastening specification. Restriction for coastal and abnormal wind uplift applications: Typical considerations: ASCE Exposure D.

Buildings over 350 ft (107 m). Buildings with positive pressure. Canopy construction. Hangar facilities and other buildings with wall openings greater than 10 percent of a side wall area. General design recommendation: Any one of the above factors is a valid reason to consider increased perimeter and field fastening.

Dow may require enhanced system design in the absence of significant compensating factors. Dow should be consulted before committing to a design and/or cost. Special perimeter requirements may be set unless minimum 84 inches (2134 mm) high walls are continuous on at least three sides. Field fastening will normally be 12 inches (305 mm) o.c. or tighter. Air retarder system may be required for buildings with positive pressure or wall openings greater than 10 percent..

** NOTE TO SPECIFIER ** Delete Fully Adhered Membrane Installation if not required.

Fully Adhered Membrane Installation:

Outside ambient air temperature must be a minimum 40 degrees F (4.4 degrees C) and rising.

For roofs with interior drainage, start with first sheet centered on drain valley. Fold sheet so that the bottom side half of the full length of sheet is exposed.

Apply a 100 percent continuous coat of bonding adhesive to the exposed bottom side of the sheet and the corresponding substrate area. Allow adhesive to dry until tacky and does not string or stick to a dry finger. When sufficiently dry, carefully unfold the glued portion of the membrane in a rolling motion onto the glued substrate surface, avoiding any wrinkles or air pockets. Immediately roll the adhered area using a weighted pressure roller. Applying pressure with a weighted roller is required to promote full contact of the membrane with adhesive.

Repeat the procedure for the other half of the sheet.

For roofs with edge drainage, start at the low edge with the first sheet.

Lay out the second sheet with a 2 inches (51 mm) overlap on the edge of the first sheet. Perform lap splice. After splice has cooled, completely expose the bottom side of the second sheet by folding back along the splice. Apply adhesive evenly to both underside of membrane and substrate surface, allow to dry to the point where the adhesive is tacky, and carefully turn membrane back onto glued substrate surface avoiding any wrinkles or air pockets. Roll surface using a weighted pressure roller applying pressure to promote full contract. Repeat procedure for each sheet proceeding across roof.

Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.

The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.

Cut edges shall be caulked by applying sealant.

At perimeters that are to receive a gravel stop or metal edging, the membrane shall be brought over the outside edge and terminated 12 inches (305 mm) o.c.

Membrane shall be mechanically attached 12 inches (305 mm) o.c. at all perimeters and at any penetration that has a dimension of 24 inches (610 mm) or greater with fasteners and plates.

** NOTE TO SPECIFIER ** Delete if not required.

Mechanically Attached Membrane Installation:

** NOTE TO SPECIFIER ** Delete if perimeter sheets not required.

Perimeter Sheets: Two or more perimeter sheets shall be installed at exposed perimeter areas. Perimeter sheets shall be laid out in an approved pattern as shown in Standard Detail DR-601 and DR-602. Fastener and plate combination shall be installed along the edge of the membrane through the insulation and into the roof deck. At perimeters that are to receive a gravel stop or metal edging, membrane shall be brought over the outside edge and terminated 12 inches (610 mm) o.c.

Field sheets: Membrane shall be unrolled on the area to be covered. Fastener and plate combination shall be installed along the leading edge of the membrane through the insulation and into the roof deck. Adjacent rolls of membrane shall overlap the fastened edge of the installed membrane.

Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.

The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.

Cut edges shall be caulked by applying sealant.

Perimeter fastening: membrane secured to perimeter gravel stops or drip edges shall be secured to wood nailers. Membrane shall be fastened at other terminations by using fasteners and seam plates.

** NOTE TO SPECIFIER ** Delete if not required.

Vented Roof Assembly Membrane Installation:

** NOTE TO SPECIFIER ** Delete if perimeter sheets not required.

Air seal: The membrane shall be sealed and mechanically attached at all perimeters and through deck penetrations.

VRS Valves shall be installed at engineered locations determined by roofing manufacturer.

Membrane shall be mechanically fastened 6 inches (152 mm) o.c. at perimeter and through-deck penetrations. Wood nailers and membrane attachment requirements for perimeter gravel stops or drip edges are independent and in addition to the air seal terminations.

** NOTE TO SPECIFIER ** Not required, unless unusual uplift requirements or project conditions require perimeter sheets to provide manufacturer's extended system warranty. Consult manufacturer.

Perimeter Sheets: Not required.

Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.

The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.

Cut edges shall be caulked by applying sealant.

Flashing Installation: Perimeters, curbs, vents, expansion joints, drains, and other details shall be flashed. Under no circumstances shall flashings cover weep holes or any form of through-wall drainage.

Pipe flashings shall be installed in accordance with manufacturer's detail. Do not flash to lead.

Expansion joints shall be installed according to manufacturer's detail.

Roof drains shall be installed in accordance with manufacturer's detail.

** NOTE TO SPECIFIER ** Delete if not required.

In reroofing, old drains must be cleaned or replaced as needed for clamping detail. All bolts shall be properly secured to supply 100 percent continuous compression of the clamping ring. Remove old leads and packings. Field seams shall not be run through drains. Prefabricated sleeve insert with a clamping ring and backflow seal are acceptable.

Metal Work Installation:

Metal work shall be installed in a manner that prevents damage from buckling or wind.

Metal work shall be sealed and waterproofed.

Overnight Seal/Temporary Water Stop Installation:

Water stop shall be made by a sealant method approved by manufacturer.

Roofing contractor shall coordinate installation to ensure the system is made watertight at the end of each work day.

** NOTE TO SPECIFIER ** Mechanically attached and adhered systems only. Delete if not required.

Roof Walkways Installation: When regular and routine roof traffic is anticipated (for example, to service rooftop units), walkway roll is required to be installed over the membrane.

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 inch (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 ** Ballasted systems only. Delete if not required.

Roof Walkways Installation: When regular and routine roof traffic is anticipated (for example, to service rooftop units), pavers are required to be installed in lieu of stone ballast.

Pavers must not exceed 60 lb (27 kg) each or exceed the compressive strength of the insulation board or substrate.

A slip sheet shall be installed for areas having regular roof traffic.

3.4

INSPECTION

Destructive tests shall be performed daily on a 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.

Additional 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 Dow approved specifications and details. Upon approval of the project, a Warranty shall be written.

3.5

PROTECTION

Protect installed products until completion of project.

** NOTE TO SPECIFIER ** Delete if not required.

Paver Ballast System:

When equipment is rolled across the roof, provisions shall be made to minimize cracking the pavers by placing plywood sheets in the traffic path and the use of wide- tread balloon tires.

Do not roll or place window washing rigs directly on paver units.

Touch-up, repair or replace damaged products before Substantial Completion.

END OF SECTION