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Dow Roofing Systems Thermoplastic Membrane Roofing (PVC)
 
         
SECTION 07532
 
         
THERMOPLASTIC MEMBRANE ROOFING (PVC)
 
         
          ** 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: 877-TPO-ROOF
Tel: 413-533-8100
Fax: 413-552-1070
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, Stevens has become the specified choice for building owners, architects, specifiers and roofing contractors the world over for both new construction and re-roofing applications.

Stevens Metal Roof Retrofit System As the leading manufacturer of TPO based roofing membranes, Dow Roofing Systems has engineered a durable, light-weight roofing membrane system specifically for retrofitting tired, aging, metal roof decks regardless of whether it is a standing seam, flat seam, or corrugated metal roof.
Stevens EP-Profile System Stevens EP Profile is specifically designed as an aesthetic element for use on visible roof surfaces covered with the Stevens EP brand of TPO (thermoplastic polyolefin). In addition, the Stevens EP Profile can be installed on an entire roof surface or only on a portion of the product, such as on a mansard.
Stevens Vented Roof System The Stevens Vented Roof System (VRS) combines a reliable, time proven Stevens EP or Stevens Hypalon roofing membrane with an air-sealed assembly and release vent technology. This creates a system that neutralized the power of the wind and keeps the membrane tightly secured to a monolithic deck or air barrier over steel or wood. All without the need for added cost of fasteners, stone ballast, pavers or adhesives in the field of the roof.
Energy Efficient Since 1985, Dow Roofing Systems has been a leading industry advocate of the benefits associated with white reflective roofing. Stevens 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.
 
          PART 1GENERAL
 
          1.1SECTION INCLUDES
          ** NOTE TO SPECIFIER ** Delete items below not required for project.
 
          A.Mechanically attached thermoplastic (PVC/Evaloy) roof membrane systems including insulation, roof edge and accessories.
 
          B.Fully adhered thermoplastic (PVC/Evaloy) roof membrane systems including insulation, roof edge and accessories.
 
          C.Fully adhered thermoplastic (PVC/Evaloy) fleece backed roof membrane systems including insulation, roof edge and accessories.
 
          1.2RELATED SECTIONS
          ** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
 
          A.Section 06100 - Rough Carpentry: For nailers and roof assembly support.
          ** NOTE TO SPECIFIER ** Metal work other than Stevens Edge Metal Systems is not covered by Stevens for Warranty. Metal work must be secured in a manner approved by Stevens 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.
 
          B.Section 07620 - Sheet Metal and Trim.
 
          1.3REFERENCES
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
          A.ASTM C-578 - Standard Specification for Rigid Cellular Polystyrene Thermal Insulation.
 
          B.ASTM D 312 - Standard Specification for Asphalt Used in Roofing.
 
          C.ASTM D 4434 - Standard Specification for Poly(Vinyl Chloride) Sheet Roofing.
 
          1.4SUBMITTALS
 
          A.Submit under provisions of Section 01300.
 
          B.[ Product Data ]: Manufacturer's data sheets on each product to be used, including:
          1.Samples and data sheets of materials with approval by manufacturer of all materials not supplied by roofing manufacturer.
          2.Preparation instructions and recommendations.
          3.Storage and handling requirements and recommendations.
          4.Installation methods.
 
          C.Shop Drawings:
          1.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.
 
          D.Warranty Certification:
          1.Submit warranty certification from manufacturer of approval of project design and intent to issue warranty.
          ** NOTE TO SPECIFIER ** Mechanically fastened roof systems over gypsum, cementitious woodfiber decks ("Tectum") and light-gauge metal panel roofs. Delete if not required
          2.Fastener pull tests from an independent testing agency shall be approved by the roofing manufacturer.
          ** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
 
          E.Selection Samples: For each finish product specified, two complete sets of color chips representing manufacturer's full range of available colors and patterns.
 
          F.Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.
 
          1.5QUALITY ASSURANCE
          ** NOTE TO SPECIFIER ** Include manufacturer qualifications. Delete if not required.
 
          A.Manufacturer Qualifications:
 
          B.Installer Qualifications:
          1.Roofing contractor shall be authorized by Stevens to install assembly.
 
          C.Material Qualification:
          1.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.
 
          D.Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.
          1.Finish areas designated by Architect.
          2.Do not proceed with remaining work until workmanship, color, and sheen are approved by Architect.
          3.Refinish mock-up area as required to produce acceptable work.
 
          1.6DELIVERY, STORAGE, AND HANDLING
 
          A.Packaging shall bear the UL label.
 
          B.Store products in manufacturer's unopened packaging until ready for installation.
 
          C.Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.
 
          1.7PROJECT CONDITIONS
 
          A.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 Stevens Edge Metal Systems is not covered by Stevens for Warranty. See General Warranty section on the Stevens Technical Manual CD-Rom for more information. Refer to Appendix E, Additional Requirements for Stevens 20-year Warranty Systems.
 
          1.8WARRANTY
 
          A.A manufacturer's representative shall inspect the installation for compliance with manufacturer's standards upon completion of the roofing system.
          1.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 Stevens 20-year Warranty Systems. Delete if not required.
 
          B.Upon acceptance of the roofing system installation, a Standard System Warranty will be issued for:
          ** NOTE TO SPECIFIER ** Delete warranty period not required.
          1.Five (5) year period that covers wind damage up to 60 mph (97 k/hr).
          2.Ten (10) year period that covers wind damage up to 60 mph (97 k/hr).
          3.Fifteen (15) year period that covers wind damage up to 60 mph (97 k/hr).
          4.Twenty (20) year period that covers wind damage up to 60 mph (97 k/hr).
          ** NOTE TO SPECIFIER ** Refer to Appendix E, Additional Requirements for Stevens 20-year Warranty Systems. Delete if not required.
 
          C.Upon acceptance of the roofing system installation, a Total System Warranty will be issued for:
          ** NOTE TO SPECIFIER ** Delete warranty period not required.
          1.Five (5) year period that covers wind damage up to 60 mph (97 k/hr).
          2.Ten (10) year period that covers wind damage up to 60 mph (97 k/hr).
          3.Fifteen (15) year period that covers wind damage up to 60 mph (97 k/hr).
          4.Twenty (20) year period that covers wind damage up to 60 mph (97 k/hr).
 
          PART 2PRODUCTS
 
          2.1MANUFACTURERS
 
          A.Acceptable Manufacturer: Dow Roofing Systems, which is located at: 9 Sullivan Rd. ; Holyoke, MA 01040-2800; Toll Free Tel: 877-TPO-ROOF; Tel: 413-533-8100; Fax: 413-552-1070; 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.
 
          B.Substitutions: Not permitted.
 
          C.Requests for substitutions will be considered in accordance with provisions of Section 01600.
 
          2.2MATERIALS
 
          A.Membrane shall be Stevens EV membranes as manufactured by Dow Roofing Systems.
          ** NOTE TO SPECIFIER ** Delete fleece back if not required.
          1.Membrane shall be laminated to a non-woven polyester fleece-backing. Fleece backed membrane shall have a selvage edge of non-fleeced area of membrane the length of the sheeting to allow for hot-air welding seam overlaps. Fleece membrane shall be Stevens EV-Fleece as manufactured by Dow Roofing Systems.
          ** NOTE TO SPECIFIER ** Delete color not required.
          2.Color: White.
          3.Color: Light Gray.
          ** NOTE TO SPECIFIER ** Delete thickness not required.
          4.Membrane shall be .045 inch (1.15 mm) nominal thickness overall, scrim-reinforced, Elvaloy-based sheet 76.5 inches (1943 mm) wide.
          5.Membrane shall be .060 inch (1.5 mm) nominal thickness overall, scrim-reinforced, Elvaloy-based sheet 76.5-inches (1943 mm). wide.
          ** NOTE TO SPECIFIER ** Not available for fully adhered systems or fleece backed membranes. Delete thickness not required.
          6.Membrane shall be .080 inch (2.0 mm) nominal thickness overall, scrim-reinforced, Elvaloy-based sheet 78 inches (1981 mm) wide.
 
          B.Membranes shall meet the ASTM D-4434-96 specification for PVC-based roofing membranes.
          1.Perimeter Sheet specification is defined as membrane with a minimum width of 38.25 inches (972 mm) and a maximum width of 52.5 inches (1334 mm).
 
          C.Flashing shall be .045 inch (1.15 mm) thick membrane for walls and curbs regardless of roof cover sheet thickness.
 
          D.Unreinforced .055 inch (1.4 mm) thick, Elvaloy-based membrane shall be supplied for field-fabricated details not required to be factory formed.
 
          E.Related Materials and Accessories:
          ** NOTE TO SPECIFIER ** Delete if not required with fleece membranes.
          1.Fleece Plural Component Spray Bonding Adhesive: Manufactured for spray application of two component bonding of fleece membrane in horizontal applications to wood, concrete and approved roof insulation board surfaces.
          ** NOTE TO SPECIFIER ** Delete if fleece membranes not required.
          2.Fleece Water-based Bonding Adhesive: Manufactured for bonding Stevens EV-Fleece membrane in horizontal applications to wood, concrete and approved roof insulation board surfaces.
          3.Bonding Adhesive: Stevens EV Bonding Adhesive shall be used for bonding all Stevens EV membranes and flashing membranes to wood, metal, masonry, and approved roof insulation board surfaces.
          4.All-Purpose Sealant: Stevens 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.
          5.Cut-Edge Sealant: Stevens EV Cut-Edge Sealant is a solvent-based caulk and shall be used for to seal exposed cut edges of reinforced membrane.
          6.Insulation Adhesive: Stevens 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. Stevens-OlyBond 500 and Stevens-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.
          7.Termination bar: Stevens Termination Bar shall be fastened 6 inches (152 mm) o.c.
          8.Edge Metal Systems: Stevens Edge Metal shall be installed per standard SR details.
          9.Roof walkways: Stevens EV Walkway Roll heat welded to the membrane where indicated or required for warranty.
          10.Prefabricated EV Pipe Boots: Shall be used for vent stacks and pipes 1 inch (25 mm) to 6 inches (152 mm) diameter.
          11.Prefabricated EV Corners: Shall be used for flashing for use at outside and inside corners.
          12.Slip Sheet: Medium to heavy weight (6 oz (170 g) or heavier) nonwoven polyester fabric.
          13.Flashing Tape: Shall be used for stripping-in gravel stop and drip edge metal.
 
          F.Fasteners: Fastener type, length and pull-out resistance shall be approved by roofing manufacturer as supplied by roofing manufacturer.
          ** NOTE TO SPECIFIER ** Insulation or protection boards other than those referenced in Appendix MA-A or FA-B must be accepted in writing by Stevens. Insulation/underlayment/recover board: Stevens supplies a wide range of insulations, underlayments and coverboards to satisfy a broad spectrum of design conditions. Only Stevens brand insulation products will be eligible for Total System Warranty coverage; products other than Stevens will incur a premium warranty fee. (Reference Appendix MA-B, Stevens Approved Insulation List and Fastening Rates for Mechanically Attached Systems) Delete insulation not required.
 
          2.3INSULATION
 
          A.Stevens ISO 2000: 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.
          1.Compressive strength: 20 psi (138 kPa).
          2.Compressive strength: 25 psi (172 kPa).
 
          B.Stevens 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.
          1.Compressive strength: 20 psi (138 kPa).
          2.Compressive strength: 25 psi (172 kPa).
 
          C.Stevens 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).
 
          D.Stevens 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.
 
          E.Stevens 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 Stevens Product Specification Data Sheets for additional information. Delete if not required.
 
          F.DensDeck Roof Boards:
          ** NOTE TO SPECIFIER ** Delete roof board and thickness not required.
          1.G-P Gypsum Corporation: Nonstructural, glass mat faced gypsum panel with water-resistant core. 1/4 inch (6 mm) DensDeck Roof Board.
          2.G-P Gypsum Corporation: Nonstructural, glass mat faced gypsum panel with water-resistant core. 1/2 inch (13 mm) DensDeck Roof Board.
          3.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.
          4.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.
          5.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.
          6.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.
          7.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.
          8.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.
          9.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 3EXECUTION
          ** NOTE TO SPECIFIER ** Adhesives, solvents, and caulks as indicated are extremely flammable and/or toxic. Follow precautions indicated on container or packaging labels.
** NOTE TO SPECIFIER ** 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 Stevens for adhered applications of Stevens EV membrane.
** NOTE TO SPECIFIER ** 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 Stevens ASAP and Stevens PIF Fasteners.
** NOTE TO SPECIFIER ** Block off or shut down positive pressure building ventilation systems during application to prevent sheet from billowing during application.
** NOTE TO SPECIFIER ** Consideration should be given in the project design to potential safety problems that can precipitate from the smooth surface characteristic of the Stevens EV 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 inches per foot (170 mm/m).
** NOTE TO SPECIFIER ** 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.
** NOTE TO SPECIFIER ** All rooftop mechanical units are to have their condensation lines piped to drains, or off the roof.
** NOTE TO SPECIFIER ** 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.
** NOTE TO SPECIFIER ** At the discretion of Stevens, excessive patching as a result of damage to the Stevens EV membrane, or caused by faulty installation, may require total recover in those areas.
** NOTE TO SPECIFIER ** 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 Stevens for suitability of application and possible design enhancement requirements.
** NOTE TO SPECIFIER ** Asphalt, coal tar base, oil base or plastic roof cements, and resaturated roof products shall not be used in direct contact with Stevens EV roof membrane.
** NOTE TO SPECIFIER ** Stevens standard details SR-502 and SR-503 are not applicable for the Stevens EV system. Contact Stevens Technical Review Dept. for acceptable tie-in details.
 
          3.1EXAMINATION
 
          A.Do not begin installation until substrates have been properly prepared.
          ** NOTE TO SPECIFIER ** Reroofing: Use #2 or better wood treated for rot resistance. Creosote and asphaltic preservatives are not acceptable.
** NOTE TO SPECIFIER ** New roofing: As specified by architect. A pressure preservative treated wood nailer is recommended. Effective perimeter attachment must be achieved per details.
** NOTE TO SPECIFIER ** 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.
** NOTE TO SPECIFIER ** 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.
** NOTE TO SPECIFIER ** Nailers around skylights, curbs, expansion joints, etc., are not required. Use of Stevens Plates and Screws anchored to deck 12 inches (304 mm). o.c. through membrane and insulation is acceptable.
 
          B.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.
 
          C.If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
 
          3.2PREPARATION
          ** NOTE TO SPECIFIER ** Vapor retarder is not required for protection of Stevens 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 Stevens 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.
 
          A.Steel Deck:
          1.Shall be covered with an approved insulation mechanically fastened or adhered to the deck.
 
          B.Wood Plank:
          1.Shall be covered with an approved insulation mechanically fastened or adhered to the deck.
 
          C.Lightweight Cementitious Decks:
          1.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 SR Detail Drawings) where deck joints exceed 1/4 inch (6 mm) or when crossing a building expansion joint. Delete deck type not required.
 
          D.Concrete Deck:
          1.Concrete shall be fully cured, and prepared smooth with dust removed.
          2.Concrete shall be dry, flat, clean, smooth, free of sharp edges and suitable for acceptance of membrane.
 
          E.Plywood Deck: Shall be dry, flat, clean, smooth, free of sharp edges and suitable for acceptance of membrane.
 
          F.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.
 
          G.Reroofing Over Existing Roof:
          1.Surface shall be dry, smooth and even, blisters cut, and loose aggregate removed.
          2.Installation of approved insulation or cover board shall comply with manufacturer's standards.
          ** NOTE TO SPECIFIER ** Delete if fleece membranes not adhered directly to existing roof.
          3.Fleece membrane shall be directly adhered using hot asphalt (ASTM D-312 type III or IV) to an existing smooth surfaced asphalt built-up roof system (type III or IV asphalt), modified bitumen, and mineral surfaced cap sheet that has been power washed removing all loose granules. Do not adhere fleece membrane directly to low melting point asphalt. Softening point of the asphalt shall not be below 185 degrees F (85 degrees C).
          ** NOTE TO SPECIFIER ** Delete if fleece membranes adhered using plural component NC adhesive.
          a.Barbed metal seam plates and appropriate fastener shall be used to anchor the membrane to the deck at perimeters and penetrations.
 
          H.Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
 
          3.3INSTALLATION
 
          A.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 Stevens EV membrane or EV fleece membranes 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 Stevens. For Total System Warranty applications, insulation plates and fasteners must be supplied by Stevens (Reference Appendix MA-B, Approved Insulation List & Fastening Rates). Delete if not required.
 
          B.Insulation Installation:
          1.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, Stevens permits adhering insulation with Stevens Insulation Adhesive and other approved insulation adhesives. The specific application must be approved in writing from the adhesive manufacturer and be approved by Stevens Technical Review Dept. Delete if not required.
          2.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, Stevens 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 Stevens 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.
          3.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.
          4.Tapered Insulation:
          a.Tapered edge strip of high density fiberboard shall be used to provide a smooth transition to the flat areas.
          b.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 ** 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 ** Stevens 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 Stevens 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 EV 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 Stevens 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 Stevens 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. Stevens may require enhanced system design in the absence of significant compensating factors. Stevens 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.
 
          C.Fully Adhered Membrane Installation:
          1.Outside ambient air temperature must be a minimum 40 degrees F (4.4 degrees C) and rising.
          2.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.
          ** NOTE TO SPECIFIER ** Delete if NC adhesive or fleece required.
          3.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.
          ** NOTE TO SPECIFIER ** Delete if NC adhesive or fleece not required.
          4.Spray apply a 100 percent continuous coat of adhesive to the area of substrate exposed by folding membrane back. Work evenly across the area to ensure membrane will be rolled into wet adhesive. Carefully unroll the folded section of Stevens EV-Fleece membrane and lower it onto the glued substrate surface while adhesive is wet, avoiding any wrinkles or air pockets. Immediately broom the adhered area applying pressure to promote full contact.
          5.Repeat the procedure for the other half of the sheet.
          6.For roofs with edge drainage, start at the low edge with the first sheet.
          7.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.
          8.Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.
          a.The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.
          b.Cut edges shall be caulked by applying sealant.
          ** NOTE TO SPECIFIER ** Delete if fleece membrane not required.
          c.For areas of fleece membrane that do not have a selvage edge, weld a coverstrip of standard 6 inches (152 mm) wide reinforced non fleece membrane.
          9.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.
          10.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.
 
          D.Mechanically Attached Membrane Installation:
          ** NOTE TO SPECIFIER ** Delete if perimeter sheets not required.
          1.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 SR-601 and SR-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.
          2.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.
          3.Lap Splice: Membrane shall be overlapped and hot-air welded without any contaminants (adhesive, dirt, debris, etc.) in the seam.
          a.The entire lap edge shall be probed with an approved seam probing tool after the seam has cooled completely to verify seam consistency.
          b.Cut edges shall be caulked by applying sealant.
          4.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.
 
          E.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.
          1.Pipe flashings shall be installed in accordance with manufacturer's detail. Do not flash to lead.
          2.Expansion joints shall be installed according to manufacturer's detail.
          3.Roof drains shall be installed in accordance with manufacturer's detail.
          ** NOTE TO SPECIFIER ** Delete if not required.
          4.Fleece backing shall be removed from the back of membrane (or an additional strip of non-fleece membane added) prior to the completion of any compression seals that use fleece-back membrane.
          ** NOTE TO SPECIFIER ** Delete if not required.
          5.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.
          ** NOTE TO SPECIFIER ** Metal work other than Stevens Edge Metal Systems is not covered by Stevens for Warranty. Metal work must be secured in a manner approved by Stevens 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.
 
          F.Metal Work Installation:
          1.Metal work shall be installed in a manner that prevents damage from buckling or wind.
          2.Metal work shall be sealed and waterproofed.
 
          G.Overnight Seal/Temporary Water Stop Installation:
          1.Water stop shall be made by a sealant method approved by manufacturer.
          2.Roofing contractor shall coordinate installation to ensure the system is made watertight at the end of each work day.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          H.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.
          1.Membrane shall be clean and dry. Remove any visible dirt and debris.
          2.Position walkway roll and cut to desired length.
          3.Walkway shall not cover seams. Walkway roll shall be kept a minimum of 2 inches (51 mm) 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.
          4.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.
 
          3.4INSPECTION
 
          A.Destructive tests shall be performed daily on a 3 inches (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.
          1.A properly welded seam will have membrane delamination from scrim prior to weld failure.
          2.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.
 
          B.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 Stevens approved specifications and details. Upon approval of the project, a Warranty shall be written.
 
          3.5PROTECTION
 
          A.Protect installed products until completion of project.
 
          B.Touch-up, repair or replace damaged products before Substantial Completion.
 
         
END OF SECTION