075423 Thermoplastic Polyolefin Roofing.docx

Renovate Pharmacy for USP 800 08-01-16 VAMC New Orleans, LA

SECTION 07 54 23

THERMOPLASTIC POLYOLEFIN (TPO) ROOFING

GENERAL

SUMMARY

Section Includes:

Thermoplastic Polyolefin (TPO) sheet adhered to deck.

APPLICABLE PUBLICATIONS

Comply with references to extent specified in this section.

American Society of Civil Engineers/Structural Engineering Institute (ASCE/SEI):

710 - Minimum Design Loads for Buildings and Other Structures.

American Society of Heating, Refrigerating and AirConditioning Engineers, Inc. (ASHRAE):

90.113 - Energy Standard for Buildings Except LowRise Residential Buildings.

ASTM International (ASTM):

C137115 - Determination of Emittance of Materials Near Room Temperature Using Portable Emissometers.

D187608(2015)e1 - Peel Resistance of Adhesives (TPeel Test).

D4434/D4434M15 - Poly(Vinyl Chloride) Sheet Roofing.

D6878/D6878M13 - Thermoplastic Polyolefin Based Sheet Roofing.

E40813 - Total Normal Emittance of Surfaces Using InspectionMeter Techniques.

National Roofing Contractors Association (NRCA):

Manual15 - The NRCA Roofing Manual: Membrane Roofing Systems.

U.S. Department of Agriculture (USDA):

BioPreferred® Program Catalog.

UL LLC (UL):

58006 - Tests for Uplift Resistance of Roof Assemblies.

189715 - Uplift Tests for Roof Covering Systems.

U.S. Department of Commerce National Institute of Standards and Technology (NIST):

DOC PS 109 - Structural Plywood.

DOC PS 204 - Performance Standard for WoodBased StructuralUse Panels.

SUBMITTALS

Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

Submittal Drawings:

membrane layout.

membrane seaming and joint details.

membrane penetration details.

Manufacturer's Literature and Data:

Description of each product.

Installation instructions.

Warranty.

Samples:

Membrane: 150 mm (6 inch) square.

Membrane Seam: 300 mm (12 inches) square.

Certificates: Certify products comply with specifications.

Fire and windstorm classification.

DELIVERY

Deliver products in manufacturer's original sealed packaging.

Mark packaging, legibly. Indicate manufacturer's name or brand, type, and manufacture date.

Before installation, return or dispose of products within distorted, damaged, or opened packaging.

STORAGE AND HANDLING

Comply with NRCA Manual storage and handling requirements.

Store products indoors in dry, weathertight facility.

Store adhesives according to manufacturer's instructions.

Protect products from damage during handling and construction operations.

Products stored on the roof deck must not cause permanent deck deflection.

FIELD CONDITIONS

Environment:

Product Temperature: Minimum 4 degrees C (40 degrees F) for minimum 48 hours before installation.

WARRANTY

Construction Warranty: FAR clause 52.24621, "Warranty of Construction."

Manufacturer's Warranty: Warrant roofing system against material and manufacturing defects and agree to repair any leak caused by a defect in the roofing system materials or workmanship of the installer.

Warranty Period: 10 years.

PRODUCTS

SYSTEM DESCRIPTION

Roofing System: Thermoplastic Polyolefin (TPO) sheet roofing adhered to deck.

PRODUCTS - GENERAL

Provide roof system components from one manufacturer.

Sustainable Construction Requirements:

Biobased Content: Where applicable, provide products designated by USDA and meeting or exceeding USDA recommendations for biobased content, and products meeting Rapidly Renewable Materials and certified sustainable wood content definitions; refer to www.biopreferred.gov.

Low PollutantEmitting Materials: Comply with VOC limits specified for the following products:

Nonflooring adhesives and sealants.

TPO ROOFING MEMBRANE

TPO Sheet: ASTM D6878/D6878M, internally fabric or scrim reinforced, 1.5 mm (60 mils) thick, with no backing with fabric backing //.

MEMBRANE ACCESSORY MATERIALS

Bonding Adhesive: Manufacturer's standard, water based.

Metal Termination Bars: Manufacturer's standard, stainlesssteel or aluminum, 25 mm wide by 3 mm thick (1 inch wide by 1/8 inch thick) factory drilled for fasteners.

Battens: Manufacturer's standard, galvannealed or galvanized steel sheet, 25 mm wide by 1.3 mm thick (1 inch wide by 0.05 inch thick), factory punched for fasteners.

Primers, Sealers, TJoint Covers, Lap Sealants, and Termination Reglets: As specified by roof membrane manufacturer.

Adhesive and sealant materials recommended by system manufacturer for intended use, identical to materials utilized in approved listed roofing system, and compatible with membrane.

ACCESSORIES

Deck Materials:

Plywood: NIST DOC PS 1, Grade CD Exposure 1.

EXECUTION

EXAMINATION

Examine and verify substrate suitability with roofing Installer present.

Verify roof penetrations are complete, secured against movement,and firestopped.

Verify roof deck is adequately secured to resist wind uplift.

Verify roof deck is clean, dry, and inplane ready to receive roofing system.

Correct unsatisfactory conditions before beginning roofing work.

PREPARATION

Complete roof deck construction before beginning roofing work:

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

Coordinate roofing membrane installation with flashing work and roof insulation work so insulation and flashing are installed concurrently to permit continuous roofing operations.

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

Dry out surfaces // including roof deck flutes, // that become wet from any cause during progress of the work before roofing work is resumed. Apply materials to dry substrates, only.

Broom clean roof decks. Remove dust, dirt and debris.

Remove projections capable of damaging roofing materials.

Concrete Decks, except Insulating Concrete:

Test concrete decks for moisture according to ASTM D4263 before installing roofing materials.

Prime concrete decks. Keep primer back 100 mm (4 inches) from precast concrete deck joints.

Allow primer to dry before application of bitumen.

Insulating Concrete Decks:

Allow to dry out minimum five days after installation before installing roofing materials.

Allow additional drying time when precipitation occurs before installing roofing materials.

Poured Gypsum Decks: Dry out poured gypsum according to manufacturer's instructions before installing roofing materials.

Existing Membrane Roofs and Repair Areas:

Comply with requirements in Section 07 01 50.19 PREPARATION FOR REROOFING.

INSTALLATION - GENERAL

Install products according to manufacturer's instructions and approved submittal drawings.

When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

Comply with NRCA Manual installation requirements.

SPEC WRITER NOTE: The code requires roof coverings on fully adhered or mechanically fastened nonballasted roofs to be tested according to UL 580 or UL 1897.

Comply with // UL 580 // UL 1897 // for uplift resistance.

Do not allow membrane and flashing to contact surfaces contaminated with asphalt, coal tar, oil, grease, or other substances incompatible with TPO.

INSTALLATION

Install the membrane so the sheets run perpendicular to the long dimension of the boards.

Lap membrane.

Position the membrane free of buckles and wrinkles.

Roll membrane out; inspect for defects as membrane is unrolled. Remove defective areas:

Lap edges and ends of sheets 50 mm (2 inches) or more as recommended by the manufacturer.

Heat weld laps. Apply pressure as required. Seam strength of laps as required by ASTM D4434/D4434M.

Check seams to ensure continuous adhesion and correct defects.

Finish seam edges with beveled bead of lap sealant.

Anchor membrane perimeter to deck or wall as indicated on drawings.

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

Repair fishmouths and wrinkles by cutting to lay flat and installing patch over cut area extending 100 mm (4 inches) beyond cut.

Membrane Perimeter Anchorage:

Install batten at perimeter of each area, curb flashing, and similar penetrations on top of roof membrane as indicated on drawings.

Adhered System:

Apply bonding adhesive in quantities required by roof membrane manufacturer.

Fold sheet back on itself, clean and coat the bottom side of the membrane and the top of substrate with adhesive. Do not coat the lap joint area.

After adhesive has set according to adhesive manufacturer's instruction, roll roofing membrane into adhesive minimizing voids and wrinkles.

Repeat for other half of sheet.

Do not proceed with roofing work when pull out resistance is less than manufacturer's required resistance.

Test Results:

Repeat tests using different fastener type or use additional fasteners achieve pull out resistance required to meet specified wind uplift performance.

Patch cementitious deck to repair areas of fastener tests holes.

Examine and probe roofing membrane and flashing seams in presence of Contracting Officer's Representative and Manufacturer's field representative.

Probe seams to detect marginal bonds, voids, skips, and fishmouths.

Cut 100 mm (4 inch) wide by 300 mm (12 inch) long samples through seams where directed by Contracting Officer's Representative.

Cut one sample for every 450 m (1500 feet) of seams.

Cut samples perpendicular to seams.

Failure of samples to pass ASTM D1876 test will be cause for rejection of work.

Repair areas where samples are taken and where marginal bond, voids, and skips occur.

Repair fishmouths and wrinkles by cutting to lay flat. Install patch over cut area extending 100 mm (4 inches) beyond cut.

Manufacturer Services:

Inspect initial installation, installation in progress, and completed work.

Issue supplemental installation instructions necessitated by field conditions.

Prepare and submit inspection reports.

Certify completed installation complies with manufacturer's instructions and warranty requirements.

CLEANING

Remove excess adhesive before adhesive sets.

Clean exposed roofing surfaces. Remove contaminants and stains // to comply with specified solar reflectance performance //.

PROTECTION

Protect roofing system from traffic and construction operations.

Protect roofing system when used for subsequent work platform, materials storage, or staging.

Distribute scaffolding loads to exert maximum 50 percent roofing system materials compressive strength.

Loose lay temporary insulation board overlaid with plywood or OSB.

Weight boards to secure against wind uplift.

Remove protective materials immediately before acceptance.

Repair damage.

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