Template:All Systems - MEMBRANES EPDM, TPO

1 General

While the roof is being applied, all membrane openings at eaves, walls, vents, etc. must be sealed to prevent moisture from entering roofing or between plies of stripping.

Cold Weather Membrane Applications In cold weather regions, membrane selection must conform to the membrane manufacturer’s recommendations for January in service design temperature.

2 Mechanically Attached

 This text pertains to 2-ply mod bit membranes and is not applicable for single plies.

All mechanically fastened flexible membrane systems installed under RoofStar guarantee shall conform to the CSA A123.21-10 Standard test method for the dynamic wind uplift resistance of mechanically attached membrane roofing systems and/or the Factory Mutual I-90 Listing for mechanically attached assemblies.

3 Adhered

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4 Protected and Modified Protected Membranes

On all protected and modified protected membrane roofing projects, a filter mat of approved material is to be properly installed between gravel ballast and insulation. The filter mat is required under pre-cast pavers that are used as ballast or walkways.

Insulation, which is bonded directly to the roof membrane, is not acceptable.

Concrete Ballast, Poured-in-place concrete or concrete topping as ballast or traffic topping is not permitted in the roof guarantee programs (see section 2.1.5 Waterproofing Membrane Systems). Only ballast, which permits easy or reasonable access to the membrane, is acceptable.

Acceptable ballast includes: properly sized gravel, concrete pavers, concrete-topped insulation, etc.

Gravel Ballast: Protected Membrane and Ballasted Membrane (EPDM, TPO, PVC, etc.) Shall be clean, washed, round or crushed stone, falling within the following gradations:

35 mm (1-1/2") - 100 % Passing 25 mm (1") 70 - 100 % Passing 20 mm (3/4") 5 - 20 % Passing 12.5 mm (1/2") 0 - 6 % Passing 5 mm (3/16") 0 - 2 % Passing

Any variance to the above must be accepted by the owner or the owner's representative and be confirmed in writing.

Pedestals: Installation of proprietary (purpose-made) pedestals, with integral spacer ribs for uniform spacing of pavers, or an accepted drainage layer designed to provide vertical separation between pre-cast pavers and substrate or other underlying materials, is mandatory. The use of proprietary drainage boards or pea gravel with filter fabric to provide drainage for unit masonry products (bricks, stone, etc.), is required.

The choice of pedestal or drainage layer type is the responsibility of the design authority. Pedestals / drainage layers provide airflow for drying surfaces and assist in leveling. They should not impede the flow of water or air, and should uniformly distribute the dead load of pavers, and other unit masonry products, as well as predicted live loads.

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