Membrane systems may generate less hazardous waste and other waste than built-up roofing.

SECTION 07530 — FLEXIBLE SHEET ROOFING SYSTEM


PART 1 — GENERAL

1.01 DESCRIPTION

Extent of flexible sheet roofing includes new roofing to the stage roof area and the horizontal and steeply sloped roof areas above the retail and lobby areas.

Flexible sheet roofing (FSR) is hereby defined to include non-traffic-bearing membrane systems intended for weather exposure as primary roofing and include the following: Loosely laid and ballasted, and fully adhered EPDM (Ethylene propylene diene monomer) membrane system.

Roof insulation related to FSR is specified in this Section.

1.02 MANUFACTURER

Obtain primary flexible sheet roofing from a single manufacturer. Provide secondary materials as recommended by manufacturer of primary materials.

1.03 INSTALLER

A firm with not less than 3 years of successful experience in installation of roofing systems similar to those required for this project and which is acceptable to or licensed by manufacturer of primary roofing materials.

1.05 UL LISTING

Provide labeled materials which have been tested and listed by UL in "Building Materials Directory" for application indicated, with "Class A" rated materials/system for roof slopes shown.

1.06 FIRE PERFORMANCE CHARACTERISTICS

Provide insulation materials which are identical to those whose fire performance characteristics, as listed for each material or assembly of which insulation is a part, have been determined by testing, per methods indicated below, by UL or other testing and inspecting agency acceptable to authorities having jurisdiction:

Surface Burning Characteristics: ASTM E 84.
Fire Resistance Ratings: ASTM E 119.
Combustibility Characteristics: ASTM E 136.

1.07 SUBMITTALS

Product Data: Submit specifications, installation instructions and general recommendations from manufacturers of flexible sheet roofing system materials, for types of roofing required. Include data substantiating that materials comply with requirements.

1.08 SPECIAL PROJECT WARRANTY

Provide written warranty, signed by Manufacturer of primary roofing materials and his authorized Installer, agreeing to replace/repair defective materials and workmanship. Repairs and replacements required because of events beyond Contractor's/Installer's/Manufacturer's control (and which exceed performance requirements) shall be completed by Contractor/Installer and paid for by Owner.

Warranty period is 10 years after date of substantial completion.


PART 2 — PRODUCTS

2.01 EPDM MEMBRANE

Ethylene propylene diene monomers formed into uniform, flexible sheets, complying with the following:

Tensile Strength (ASTM D 412): 1400 psi.
Ultimate Elongation (ASTM D 412): 300%
Brittleness Temperature (ASTM D 746 ): - 75 deg. F (-59 deg. C).
Tear Resistance (ASTM D 624): 125 lbs. per lin. inch.
Resistance to Ozone Aging (ASTM D 1149): No cracks after 168 hours exposure of 50% elongated samples at 104 deg. F. (40 deg. C) and 100 pphm ozone.
Resistance to Heat Aging (ASTM D 573): Maximum reduction in elongation of 30% maximum loss of tensile strength of 15% (168 hours at 240 deg. F (116 deg. C).
Thickness: 45 mils, nominal.
Exposed Face Color: Manufacturer's standard

Manufacturers: Subject to compliance with requirements, provide products of one of the following:
Carlisle Syntec Systems
Firestone Building Products Co.

2.05 MISCELLANEOUS MATERIALS FOR FSR

Sheet Seaming System: Manufacturer's standard materials for sealing lapped joints, including edge sealer to cover exposed spliced edges as recommended by manufacturer of FSR system.

Cant Strips, Tapered Edge Strips and Flashing Accessories: Types recommended by manufacturer of FSR material, provided at locations recommended by manufacturer even if not shown, including adhesive tapes, flashing cements, and sealants.

Aggregate Surface Ballast: Washed, rounded, riverbed gravel or other acceptable smooth-faced stone ranging in size from 3/4" to 1-1/2" in diameter, which will withstand weather exposure without significant deterioration.

Mechanical Fasteners: Metal plates, caps, battens, accessory components, fastening devices, and adhesives to suit substrate and as recommended by FSR membrane manufacturer.

Membrane Adhesive: As recommended by FSR membrane manufacturer for particular substrate and project conditions, formulated to withstand min. 60 psf uplift force.

2.06 INSULATING MATERIALS

Extruded Polystyrene Board Insulation: Rigid, cellular thermal insulation with closed cells and integral high density skin, formed by the expansion of polystyrene base resin in an extrusion process to comply with ASTM C 578 for Type indicated; with 5-year aged R-values of 5.4 and 5 at 40 and 75 deg. F. (4.4 and 23.9 deg. C.)

Surface Burning Characteristics: Maximum flame spread and smoke developed values of 5 and 165, respectively.

Provide tapered boards for sloping to drain; fabricate with taper of 1/4" per ft. in the 24" dimension. Apply to achieve an average R-value of 16.

2.07 MISCELLANEOUS INSULATION MATERIALS

Mastic Sealer: Type recommended by insulation manufacturer for bonding edge joints and filling voids.

Mechanical Anchors: As recommended by insulation manufacturer for deck type, and complying with fire and insurance rating requirements.

Vapor retarder: Asphalt Coated Base Sheet, Type I (37 lbs. per square, asphalt coated) or Polyethylene film of 6 mil thickness, vapor rating of 0.20 perms, at Contractor's option.

2.08 MISCELLANEOUS VAPOR RETARDER MATERIALS

General: Provide adhesives, tapes, flashing, and other accessories as recommended by vapor retarder manufacturer to maintain vapor rating for entire barrier.

2.09 MISCELLANEOUS ROOFING ACCESSORIES

Flashing Material: Manufacturer's standard system compatible with flexible sheet membrane.

Roof Drains: Remove and repair by replacing components to like-new condition; reinstall.

Coping: Zinc-coated steel , 26 gage, hot-dipped galvanized, mill phosphatized, with manufacturer's standard accessories.


PART 3 — EXECUTION

3.01 REMOVAL AND DISPOSAL

Conduct removal and disposal operations to prevent injury to passersby and the Owner's and adjacent buildings and other facilities. Promptly repair damages caused to adjacent facilities by demolition operations at no cost to the Owner.

Maintain existing utilities in service and protect against damage during removal operations.

Do not obstruct streets, walks or other occupied or used facilities without permission from authorities having jurisdiction.

Remove from the site promptly all debris, rubbish and other materials resulting from demolition operations.

If deemed necessary by the governing authorities or the Architect, clean adjacent structures and other improvements of dust, dirt and debris caused by the demolition operations. Return adjacent areas to the condition existing prior to the start of work.

Remove and dispose of all existing ballast, flashing, insulation, roofing tile coping and other material down to the parapet masonry and structural wood deck. Clean substrate of dust, debris, and other substances detrimental to roofing work. Remove sharp projections.

Remove and dispose of all wood decking that is rotted, saturated, damaged or otherwise unsound and replace with matching new decking.

3.02 PREPARATION OF SUBSTRATE

General: Comply with manufacturers' instruction for preparation of substrate to receive FSR system.

Install cant strips, flashings, and accessory items as recommended by manufacturer even though not shown.

Prevent compounds from entering and clogging drains and conductors, and from spilling or migrating onto surfaces of other work.

3.03 VAPOR RETARDER INSTALLATION

Seal joints in vapor retarder and seal to other surfaces at extremities and penetrations of retarder. Seal over nails, staples, tears, and punctures with tape or adhesively applied strips of vapor barrier material.

3.04 INSULATION INSTALLATION

General: Extend insulation fill thickness as a single layer, in two layers, or in multiple layers over entire surface to be insulated, cutting and fitting tightly around obstructions. Form cant strips, crickets, saddles, and tapered areas with additional material as required for proper drainage of membrane. Stagger all joints in one direction for each course. For multiple layers, stagger joints both directions between courses.

Do not install more insulation each day than can be covered with membrane before end of day and before start of inclement weather.

Set insulation units loose on substrate and cover immediately with loose membrane for ballasted installation. Limit joints between adjacent units to 1/4" maximum.

3.05 FSR MEMBRANE INSTALLATION

General: Start installation only in presence of manufacturer's technical representative if required by conditions of manufacturer's warranty.

Loose-Laid and Ballasted FSR: Install membrane by unrolling over prepared substrate, fastening at perimeter and at roofing penetrations. Lap adjoining sheets as recommended by FSR manufacturer and bond as recommended by manufacturer, covering top edges of each sheet at seams with uniform fillet of sealant if recommended by manufacturer. Install flashings and counterflashings as recommended by manufacturer. Apply ballast course in uniform thickness at rate of 10 lbs. per square foot, spreading with care to minimize the possibility of damage to membrane.

Adhesive Adhered FSR: Install membrane by unrolling over prepared substrate, lapping adjoining sheets as recommended by manufacturer. Apply adhesive to surfaces to be bonded and roll FSR into place when adhesive has properly cured. Treat seams with special cement and apply sealant to exposed sheet edges, tapering application as recommended by manufacturer. Install mechanical fasteners, flashings and counterflashings, and accessories at locations and as recommended by manufacturer.



END OF SECTION 07530

FLEXIBLE SHEET ROOFING SYSTEM 07530-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org