07_WVA_01-2-Membrane_Roofing_(TPO).docx

SECTION 07 WVA 01-2

MEMBRANE ROOFING

1. GENERAL

0. REFERENCES

The publications referenced within this specification are referred to by the basic designation only.

0. ASTM International (ASTM)

0. C1289 Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board

0. D6878 Specification for Thermoplastic Polyolefin Based Sheet Roofing

0. D5469 Application of New Spray Applied Polyurethane Foam and Coated Roofing Systems.

0. National Roofing Contractors Association (NRCA)

1. The NRCA Roofing Manual: Membrane Roof Systems (2011)

1. The NRCA Roofing Manual: Architectural Metal Flashing, Condensation Control, and Reroofing (2010)

0. Unified Facilities Guide Specification (UFGS)

2. UFGS 07 21 13- Board and Block Insulation

2. UFGS 07 54 19- Polyvinyl Chloride (PVC) Roofing

2. UFGS 07 60 00- Flashing and Sheet Metal

0. SUBMITTALS

1. Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for information only. Submit the following in accordance with the Statement of Work, SUBMITTALS:

0. Shop Drawings

0. Drawing showing drainage plan and tapered insulation layout and elevations. Drawing shall include details of the flashing and roof penetrations. [G]

0. Product Data

1. Include product and installation information for insulation, adhesives, flashing, walkway pads, and membrane materials. [G]

0. Certifications

2. Proof of current Manufacturer Certified Installer Status. [G]

0. Manufacturer’s Instructions

3. MSDS for all materials used in construction.

0. Closeout Submittals

4. Twenty (20) year warranty for material and workmanship. [G]

0. QUALITY ASSURANCE

2. Delivery and Storage

0. Delivery times and location shall be coordinated with the Contracting Officer or an appointed representative.

0. Material must be stored in a dry location and elevated from the ground. All material shall not be allowed to get wet at any point before or during installation. The roof shall not be used as a staging area for materials.

2. Contractor shall follow all manufacturing material handling instructions.

1. PRODUCTS

1. Roof Membrane

0. Thermoplastic Polyolefin (TPO) - minimum thickness of 60 mils, reinforced with a 9x9, 1,000 denier polyester fabric. TPO color shall match existing roof shade.

0. Membrane must meet or exceed all requirements of ASTM D6878.

0. Product shall be Firestone Building Products UltraPly Platinum TPO, or an approved equivalent.

1. Roof Insulation

1. Insulation shall be faced polyisocyanurate and conform to C1289. Insulation shall have a minimum “aged” thermal R-value of 5.8 per inch.

1. Insulation must be compatible with the adhesive and other installed portions of the roofing system.

1. Product shall be Firestone Building Products ISO 95+ insulation or an approved equivalent.

1. Roofing Adhesives

2. All adhesives shall be approved by the insulation and membrane manufacturer for use with their products, as well as the existing substrate.

2. Insulation adhesive shall be polyurethane based, such as Firestone Building Products I.S.OSPRAY S adhesive, or an approved equivalent.

2. Adhesive for the TPO shall be Firestone Building Products Single- Ply LVOC Bonding Adhesive, or an approved equivalent.

1. Roof Flashing

3. TPO flashing for pipes and other roof penetrations shall come from same manufacturer as the membrane and be compatible with the installed system.

3. Aluminum flashing shall have a minimum gage thickness of 0.040 inches and have a mill finish. Flashing shall be attached with corrosive resistant metal fasteners.

1. Walkway Pads

4. Textured Pads shall be compatible with the installed TPO roofing system and approved by the manufacturer for use.

4. Skypaver Composite Roof Pavers, by Firestone Building Products, or approved equivalent.

1. Roof Drains

5. Roof Scupper Drains: Galvanized Cast Iron, having a four (4) inch threaded pipe outlet, similar to unit supplied by: JR Smith model #1510

5. Scupper Pipe: Galvanized cast iron, threaded as required to connect scupper to adaptor

5. Downspout Adaptor: Galvanized Cast Iron, having a four (4) inch inlet, similar to unit supplied by: JR Smith, model #1550

5. Downspout: galvanized steel, 28 gage, sized to fit adaptor above.

1. EXECUTION

2. GENERAL

0. Environmental Conditions

0. The roof shall be left in water-tight condition at the end of each work day and prior to inclement weather. This includes the sealing of edges and flashing.

0. Roofing shall only be done when the temperature is in the manufacturer specified range and there is no rain in the forecast. Roofing material shall not be installed on a wet substrate.

0. Contractor shall be held liable for damages caused by overspray of spray adhesives and other roofing material.

0. Contractor shall be responsible for cleanup of any debris that is carried from the roof to the surrounding areas.

0. Safety

1. Contractor shall follow all applicable safety rules regarding work on roofs and the use of lifts and cranes. This is to include OSHA and the WVA safety rules.

1. All work practices shall conform to the standards set in the NRCA Roofing Manual.

0. Final Requirements

2. The final roof assembly shall meet or exceed all requirements for a FM Class 1-90 roof as well as the manufacturer’s requirements for a 20-year material and workmanship warranty.

2. Vapor Barrier

1. Contractor shall not damage existing vapor barrier during demolition. Vapor barrier is to remain as part of the new roofing system.

2. Drainage

2. Contractor shall replace all roof scupper drains and install new downspouts.

2. The scupper fixture shall be complete with a four (4) inch connection pipe to a downspout adaptor. Fixtures shall be securely anchored into the masonry parapet wall. Make all necessary repairs around existing scupper opening.

2. All scuppers and drains will have a watertight connection with the membrane.

2. Thermal Insulation

3. Contractor shall lay out the insulation in a manner that utilizes the existing roof drains. Contractor shall use tapered insulation to meet achieve slopes of ¼” per foot. Insulation shall drain away from all objects on roof.

3. Insulation shall be arranged so that the average R-value of the roof is 20.

3. Insulation shall be tapered so that there is a depression in the area of the drains and does not allow for sitting water. All other areas shall have a minimum coverage of 1 ½” of insulation.

3. Insulations shall butt tightly against other boards, walls, and penetrations. Insulation shall be installed to eliminate voids.

3. Rigid insulation board shall be fully adhered using a polyurethane foam adhesive that is specified by the manufacturer as being compatible with the installed insulation as well as the substrate material. Manufacturer coverage rates and application methods shall be strictly followed.

3. Application coverage of the foam shall meet the manufacturer’s recommendations for a fully adhered system.

3. Contractor shall replace all roof drain baskets with new cast iron baskets. Roof drains shall all be properly connected to the drainage piping and leak free.

2. TPO Membrane

4. Contractor shall install premolded one piece fittings around all roof penetrations.

4. Contractor shall install grey 60 mil TPO roof membrane over the new insulation.

4. TPO membrane shall be fully adhered to the insulation using a manufacturer approved bonding adhesive. Manufacturer coverage rates and application methods shall be strictly followed.

4. Membrane shall be installed in widths that minimize the number of seams on the roof and all seams shall be heat welded. All “T” joints requiring a “T” joint cover shall have them installed. Overlaps and roofing accessories shall be installed according to the manufacturer’s requirements.

4. Membrane shall extend a minimum of 12” up the side of penthouse walls and over the top of the parapet walls.

4. Field seems of membrane shall not fall within 24 inches of roof drains, unless otherwise specified by the manufacturer.

4. TPO Membrane shall extend a minimum of 1” past the clamping ring on all roof drains.

4. At the completion of the installation, the membrane shall be one continuous piece with no breaks or tears. The membrane shall be laid flat and smooth with no creases, wrinkles or folds. The color of the membrane must not vary in shade.

2. Flashing

5. Contractor shall install aluminum flashing around all edges of the TPO membrane. Flashing shall provide a waterproof seal at all edges and roof penetrations.

5. Contractor shall provide all wood nailers and blocking necessary for installation.

5. Flashing shall be installed according to the manufacturer’s recommendations and the NRCA Roofing Manual.

5. Finished sheet metal work will form a weather tight construction without waves, warps, buckles, fastening stresses or distortion, which allows for expansion and contraction.

0. Walkway Pads

0. Manufacturer approved walk pads shall be installed according to the layout shown. They shall be adhered to the TPO membrane using the manufacturer recommended method.

0. Walk pads and pavers shall be laid out and spaced so that they do not interfere with the drainage of the roof.

0. ACCEPTANCE CHECKS AND TESTS

1. Contractor shall conduct an inspection with a manufacturer’s representative to validate a twenty (20) year material and workmanship warranty. Contractor shall submit this warranty to the government after the inspection has been conducted.

1. The roof will not be considered 100 percent complete by the government until all material has been cleaned and removed from the site. The roof shall be handed over to the government as a clean and finished product.

1. Final Acceptance: The contractor shall conduct a final walkthrough with the government for inspection of finished work. Final approval will not be granted until the warranty is obtained by the contracting officer.

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