075423 tpo.pdf

Bay Pines VA Healthcare System Eye Treatment Center and VA Project Number 516-326 and 516-334 Ambulatory Surgery Center Construction Documents-3 July 7, 2009

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SECTION 07 54 23

THERMOPLASTIC POLYOLEFIN (TPO) ROOFING

PART 1 GENERAL

1.1 DESCRIPTION

Thermoplastic Polyolefin (TPO) sheet roofing adhered to roof deck.

1.2 RELATED WORK

A. Treated wood framing, blocking, and nailers: Section 06 10 00, ROUGH

CARPENTRY

B. Roof Insulation: Section 07 22 00, ROOF AND DECK INSULATION.

C. Metal cap flashings, copings, fascias, and expansion joints: Section 07

60 00, FLASHING AND SHEET METAL.

D. Roof hatches, equipment supports, dome type skylights, and gravity ventilators: Section 07 72 00, ROOF ACCESORIES.

E. Mechanical equipment supports: Section 23 34 00, HVAC FANS and Section

23 31 00, HVAC DUCTS AND CASINGS, and Section 23 37 00, AIR OUTLETS AND

INLETS

1.3 QUALITY ASSURANCE

A. Approved applicator by the membrane roofing system manufacturer, and certified by the manufacturer as having the necessary expertise to install the specific system.

B. Pre-Roofing Meeting:

1. Upon completion of roof deck installation and prior to any roofing application, hold a pre-roofing meeting arranged by the Contractor and attended by the Roofing Inspector, Material Manufacturers

Technical Representative, Roofing Applicator, Contractor, and

Resident Engineer.

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

3. Inspect roof deck at this time to:

a. Verify that work of other trades which penetrates roof deck is completed.

b. Determine adequacy of deck anchorage, presence of foreign material, moisture and unlevel surfaces, or other conditions that would prevent application of roofing system from commencing or cause a roof failure.

c. Examine samples and installation instructions of manufacturer.

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1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Applicators approval certification by manufacturer.

C. Shop Drawings:

1. Sheet membrane layout.

2. Termination details.

D. Manufacturers installation instructions revised for project.

E. Samples:

1. Sheet membrane: One 150 mm (six inch) square piece.

2. Sheet flashing: One 150 mm (six inch) square piece.

3. Welded seam: Two 300 mm (12 inch) square samples of welded seams to represent quality of field welded seams.

F. Manufacturer’s Certificates:

1. Demonstrating product compliance with Florida product approval requirements, Florida product approval number, Miami-Dade Notice of

Acceptance (NOA) number.

G. LEED Submittals:

1. Product Data for Credit EQ 4.1: For adhesives and sealants, including printed statement of VOC content.

2. Energy Performance: Provide roofing system with initial Solar

Reflectance Index equal to or greater than 78 when calculated according to ASTM E 1980, based on testing identical products by a qualified testing agency.

1.5 DELIVERY, STORAGE AND HANDLING

A. Deliver, store, and handle materials as specified by manufacturer.

B. Store volatile materials separate from other materials with separation to prevent fire from damaging the work or other materials.

1.6 WARRANTY

Roofing work subject to the terms of the Article “Warranty of

Construction” of Section 00 72 00, GENERAL CONDITIONS, except extend the warranty period to five years.

1.7 APPLICABLE PUBLICATIONS

A. Publications listed below form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only.

B. American Society for Testing and Materials (ASTM):

A167-99(R2004)..........Stainless and Heat-Resisting Chromium-Nickel

Steel Plate, Sheet and Strip

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B209-07.................Aluminum and Aluminum-Alloy Sheet and plate

D2103-05................Polyethylene Film and Sheeting

D2240-05................Rubber Property - Durometer Hardness

D4434-06................Poly (Vinyl Chloride) Sheet Roofing

D4586-07................Asphalt Roof Cement, Asbestos Free

E96-05..................Water Vapor Transmission of Materials

E108-07.................Fire Tests of Roof Coverings

Fl667-05................Driven Fasteners: Nails, Spikes, and Staples

G21-96(R2002)...........Resistance of Synthetic Polymeric Materials to

Fungi

C. National Roofing Contractors Association (NRCA):

Fifth Edition - 05......The NRCA Roofing and Waterproofing Manual.

D. Federal Specifications (Fed. Spec.)

FF-S-107C (2)...........Screws, Tapping and Drive

FF-S-111D (1)...........Screw, Wood

UU-B-790A...............Building Paper, Vegetable Fiber (Kraft, Waterproofed, Water Repellent and Fire

Resistant)

E. Factory Mutual Engineering and Research Corporation (FM):

Annual Issue............Approval Guide Building Materials.

F. Underwriters Laboratories, Inc. (UL):

Annual Issue............Building Materials Directory

Annual Issue............Fire Resistance Directory

G. Warnock Hersey (WH):

Annual Issue............Certification Listings

PART 2 - PRODUCTS

2.1 TPO MEMBRANE ROOFING

A. Fabric-Reinforced Thermoplastic Polyolefin sheet to conform to ASTM

D6878.

1. Internally fabric or scrim reinforced, uniform flexible TPO sheet.

B. Thickness:

1. Minimum 1.52 mm (0.060 inch) thick for fully adhered system.

C. Additional Properties:

1. Exterior Fire-Test Exposure: ASTM E 108, [Class A] [Class B] [Class

C]; for application and roof slopes indicated, as determined by testing identical membrane roofing materials by a qualified testing agency. Materials shall be identified with appropriate markings of applicable testing agency.

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2.2 SEAM SEALANTS, AND ADHESIVES

A. Sheet roofing manufacturer's specified products.

B. Sealant: Liquid PVC for roofing sheet exposed lap edge.

C. Bonding Adhesives: Compatible with roofing membrane, flashing membrane, insulation, metals, concrete, and masonry for bonding roofing and flashing to substrate. VOC not to exceed 200 g/l

2.3 FASTENERS

A. Fasteners and washers required for sheet roofing to deck.

1. Wood Fasteners:

a. Fed. Spec. FF-S-111, Type I, Style 2.5, coated to resist corrosion, length to provide 19 mm (3/4 inch) minimum penetration.

b. Nails: ASTM F1667, Type I; style 20, barbed shank, galvanized.

7. Washers: Neoprene backed metal washer 28 mm (1-1/8 inch) minimum diameter.

8. To Sheet Metal: Self tapping screw; Fed. Specs. FF-S-107, No. 14, sheet metal screw, minimum thread penetration of 6 mm (1/4 inch);

stainless steel.

B. Surface Mounted Base Flashing Clamp Strip:

1. Stainless steel strip, ASTM A167 Type 302 or 304 dead soft temper, minimum 0.45 mm (0.018 inch) thick.

2. Aluminum strip: ASTM B209, alloy H14, minimum 2.4 mm (0.094) inch thick.

3. For exposed location form strips with 6 mm (1/4 inch) wide top edge bent out 45 degrees (for sealant) from 38 mm (1-1/2 inch) wide material; 2400 mm (eight feet) maximum length, with slotted holes 6 x

9 mm (1/4 inch by 3/8 inch) holes punched at 300 mm (one foot) centers, centered between bend and bottom edge.

4. For locations covered by cap flashings, form strips 32 mm (1-1/4 inches) wide; 2400 mm (eight feet) maximum length. With slotted holes 6 x 9 mm (1/4 by 3/8 inch) punched at 300 mm (one foot) centers, centered on strip width.

2.4 VAPOR RETARDER OR SEPARATION SHEETS

A. Polyethylene film: ASTM D2103, six-mils thick.

B. Building Paper: Fed. Spec. UU-B-790.

1. Water vapor resistance: Type I, Grade A, Style 4 reinforced.

2. Water vapor permeable: Type I, Grade D, Style 4 reinforced.

2.5 FLEXIBLE TUBING

A. Closed cell neoprene, butyl polyethylene, vinyl, or polyethylene tube or rod.

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B. Diameter approximately 1-1/2 times joint width.

2.6 PROTECTION MAT OR SEPARATION SHEETS

A. Protection Mat:

1. Water pervious; either woven or non-woven pervious sheet of long chain polymeric filaments or yarns such as polypropylene, black polyethylene, polyester, or polyamide; or, polyvinylidene-chloride formed into a pattern with distinct and measurable openings.

2. Filter fabric equivalent opening size (EOS): Not finer than the

U.S.A. Standard Sieve Number 120 and not coarser than the U.S.A.

Standard Sieve Number 100. EOS is defined as the number of the U.S.A.

Standard Sieve having openings closest in size to the filter cloth openings.

3. Edges of fabric selvaged or otherwise finished to prevent raveling.

4. Abrasion resistance:

a. After being abraded in conformance with ASTM D3884 using rubber-hose abrasive wheels with one kg load per wheel and 1000 revolutions, perform tensile strength test as specified in ASTM

D1682, paragraph.

b. Result; 25 kg (55 pounds) minimum in any principle direction.

5. Puncture strength:

a. ASTM D751 - tension testing machine with ring clamp; steel ball replaced with a 8 mm (5/16 inch) diameter solid steel cylinder with a hemispherical tip centered within the ring clamp.

b. Result; 57 kg (125 pounds) minimum.

6. Non-degrading under a wet or humid condition within minimum 4°C

(40°F) to maximum 66°C (150°F) when exposed to ultraviolet light.

PART 3 - EXECUTION

3.1 GENERAL

A. Do not apply roof membrane if deck will be used for subsequent work platform, storage of materials, or staging or scaffolding will be erected thereon unless protection provided to distribute loads less than one half compression resistance of roofing system materials:

1. Curbs, blocking, edge strips, and other components to which roofing and base flashing is attached to in place ready to receive insulation and roofing.

2. Coordinate roof operations with sheets metal work and roof insulation work so that insulation and flashings are installed concurrently to permit continuous roofing operations.

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3. Complete installation of flashing, insulation, and roofing in the same day except for the area where temporary protection is required when work is stopped.

B. Phased construction is not permitted. The complete installation of roofing system is required in the same day except for area where temporary protection is required when work is stopped. Complete installation includes pavers and ballast for ballasted systems.

C. Dry out surfaces that become wet from any cause during progress of the work before roofing work is resumed.

D. Apply materials only to dry substrates.

E. Except for temporary protection specified, do not apply materials during damp or rainy weather, during excessive wind conditions, nor while moisture (dew, snow, fog, ice, or frost) is present in any amount in or on the materials or when temperature is below 2o C (35 degrees F).

1. Do not apply materials to substrate having temperature of 2o C (35 degrees F) or less or when materials applied with the roof require higher application temperature.

2. Do not apply materials when the temperature is below 2o C (35 degrees

F).

F. Temporary Protection:

1. Install temporary protection consisting of a temporary seal and water cut-offs at the end of each day's work and when work is halted for an indefinite period or work is stopped when precipitation is imminent.

2. Temporarily seal exposed surfaces of insulation within the roofing membrane.

3. Do not leave insulation surfaces or edges exposed.

4. Use polyethlene film to separate roof sheet from bituminous materials.

5. Apply the temporary seal and water cut off by extending the roof membrane beyond the insulation and securely embedding the edge of the roof membrane in 150 mm (6 inch) wide strip of asphalt roofing cement, ASTM D4586, and weight edge with sandbags to prevent displacement; space sandbags not over 2400 mm (eight foot) centers.

6. Cover bituminous residue with four-mil polyethylene.

7. Before the work resumes, cut off and discard portions of the roof membrane embedded in roof cement or in contact with roof cement or bituminous materials. Cut not less than 150 mm (six inches) back from bituminous coated edges.

8. Remove and discard sandbags contaminated with bituminous products.

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9. For roof areas that are to remain intact and that are subject to foot traffic and damage, provide temporary wood walkways with notches in sleepers to permit free drainage.

10. Provide six-mil polyethylene sheeting over roofing membrane under temporary wood walkways and adjacent areas. Round all edges and corners of wood bearing on roof surface.

3.2 PREPARATION

A. Test pull out resistance of fasteners in the presence of the Resident

Engineer in deck before starting roofing work. Tests are not required for wood.

1. Test applicable fastener type in applicable deck.

2. Install fastener through a sample of the insulation, if any is to be used, into the structural deck.

3. Test the pull out resistance with a pull out tester.

4. Test one fastener in each deck level and one for every 230m2 (2500 square feet) of deck type and level.

5. Test at locations designated by Resident Engineer.

6. Do not proceed with the roofing work if the pull out resistance of the fasteners is less than specified.

7. Test results:

a. Repeat tests using other type fasteners or use additional fasteners to stay within the pullout load resistance criteria.

b. Patch cementitious deck to repair areas of fastener tests holes.

B. Remove dirt, debris, and surface moisture. Cover or fill voids greater than 6 mm (1/4) inch wide to provide solid support for roof membrane.

C. Install separation sheet over deck surfaces lapping edges and ends 150 mm (six-inches), or as recommended by roof membrane manufacturer. Do not precede installation of separation sheet beyond what can be covered by roofing membrane each day. Use polyethylene film or building paper that will be compatible with seaming method.

1. Insure separation sheet completely isolates bituminous materials from

PVC roofing membrane.

2. Turn up at penetrations, or other surfaces where bituminous materials occur, to cover bituminous product.

3. Turn down over edges of blocking at insulation perimeters covering blocking.

3.3 INSTALLATION OF ROOFING AND FLASHING

A. Do not allow the membrane to come in contact with surfaces contaminated with asphalt, coal tar, oil, grease, or other substances which are not compatible with PVC.

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B. If possible, install the membrane so the sheets run perpendicular to the long dimension of the insulation boards.

C. If possible, start at the low point of the roof and work towards the high point. Lap the sheets so the flow of water is not against the edges of the sheet. Coordinate with roof insulation installation.

D. Position the membrane so it is free of buckles and wrinkles.

E. Roll sheet out on deck; inspect for defects as being rolled out and remove defective areas. Allow for relaxing before proceeding.

1. Lap edges and ends of sheets 50 mm (two inches) or more as recommended by the manufacturer.

2. Heat weld laps. Apply pressure as required. Seam strength of laps as required by ASTM D4434.

3. Check seams to ensure continuous adhesion and correct defects.

4. Finish edges of laps with a continuous beveled bead of sealant to sheet edges to provide smooth transition.

5. Finish seams as the membrane is being installed (same day).

6. Anchor perimeter to wall as specified.

F. Membrane Perimeter Anchorage:

1. Install metal fastening strip at the perimeter of each roof level, curb flashing, expansion joints and similar penetrations as indicated and in accordance with membrane manufacturer's instructions on top of roof membrane to deck or wall.

G. Adhered System:

1. Apply adhesive in quantities required by roof membrane manufacturer.

2. Fold sheet back on itself after rolling out and coat the bottom side of the membrane and the top of the deck with adhesive. Do not coat the lap joint area.

3. After adhesive has set according to adhesive manufacturers application instruction, roll the membrane into the adhesive in a manner that minimizes voids and wrinkles.

4. Repeat for other half of sheet. Cut voids and wrinkles to lay flat and clean for repair patch over cut area.

H. Install flashings as the membrane is being installed (same day). If the flashing can not be completely installed in one day, complete the installation until the flashing is in a watertight condition and provide temporary covers or seals.

I. Flashing Roof Drains:

1. Install roof drain flashing as recommended by the membrane manufacturer, generally as follows:

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a. Coordinate to set the metal drain flashing in asphalt roof cement, holding cement back from the edge of the metal flange.

b. Do not allow the roof cement to come in contact with the roof membrane.

c. Adhere the roof membrane to the metal flashing with the membrane manufacturer's recommended adhesive.

2. Turn down the metal drain flashing and roof membrane into the drain body and install clamping ring and strainer.

M. Installing Base Flashing and Pipe Flashing:

1. Install flashing membranes to pipes, wall or curbs to a height not less than eight-inches above roof surfaces and 100 mm (four inches) on roof membrane.

a. Adhere flashing to pipe, wall or curb with adhesive.

b. Form inside and outside corners of flashing membrane in accordance with NRCA manual. Form pipe flashing in accordance with NRCA manual use pipe boot.

c. Lap ends not less than 100 mm (four inches).

d. Heat weld or solvent weld flashing membranes together and flashing membranes to roof membranes. Finish exposed edges with sealant as specified.

e. Install flashing membranes in accordance with NRCA manual.

2. Anchor top of flashing to walls or curbs with fasteners spaced not over 200 mm (eight inches) on centers. Use fastening strip on ducts.

Use pipe clamps on pipes or other round penetrations.

3. Apply sealant to top edge of flashing.

N. Installing Building Expansion Joints:

1. Install base flashing on curbs as specified.

2. Coordinate installation with or roof expansion joint system.

O. Repairs to membrane and flashings:

1. Remove sections of sheet roofing or flashing that is creased wrinkled or fishmouthed.

2. Cover removed areas, cuts and damaged areas with a patch extending

100 mm (four inches) beyond damaged, cut, or removed area. Heat weld or solvent weld to roof membrane or flashing. Finish edge of lap with sealant as specified.

3.5 TPO WALKWAYS

A. Use reinforced sheet not less than 900 mm (three feet) wide.

B. Heat weld or solvent weld walkway sheet to roof sheet at edges. Weld area 50 mm (two inches) wide by the entire length of the walkway sheet.

C. Finish edges of laps with sealants as specified.

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3.6 FIELD QUALITY CONTROL

A. Examine and probe seams in the membrane and flashing in the presence of

Resident Engineer and Membrane Manufacturer's Inspector.

B. Probe edge of welded seams with a blunt tipped instrument. Use sufficient hand pressure to detect marginal welds, voids, skips, and fishmouths.

C. Cut 100 mm (four inch) wide by 300mm (12 inch) long samples through the welded seams for every 450 m (1500 lineal feet) of seams where directed by the Resident Engineer:

1. Cut the samples perpendicular to the longitudinal direction of the seams.

2. Failure of samples to maintain the standard of quality within minimum strength and tolerance is cause for rejection of the work.

D. Repair areas of welded seams where samples have been taken or marginal welds, bond voids, or skips occurs.

E. Repair fishmouths and wrinkles by cutting to lay flat and installing patch over cut area extending 100 mm (four-inches) beyond cut.

3.7 TEMPORARY ROOF

A. Install temporary roof when sequence of work or weather does not permit installation of a completed permanent roof system or roof would be subject to phasing of roof work, construction traffic, scaffolds and work over roof area.

B. Use Type I, II or III, not less than 1.15 mm (0.045 inch) thick, or other temporary membrane as approved.

C. Install not less than 6 mm (1/4 inch) thick plywood, particleboard, or hardboard underlayment over steel decks before installing temporary roof.

D. Secure membrane to deck with mechanical fastener or temporary ballast not exceeding deck dead load capacity.

E. Repair cuts, tears, and punctures with patches to keep system watertight.

F. Install permanent roof system within one year.

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