A base sheet is the first ply laid over a roof deck or insulation in a built-up or modified bitumen roof assembly. It separates the deck from the plies above, provides a uniform surface for hot asphalt, cold adhesive or torch application, and is typically mechanically fastened to wood or nailable decks before the interply and cap sheets go down.

Sold by the roll with 300 square feet of material per roll, which allows for the side and end laps a base sheet ply requires once installed. The asphalt-saturated, reinforced construction resists tearing during unrolling and fastening and stays dimensionally stable while the remaining plies are installed.

Key Features

• First ply of a built-up or modified bitumen low-slope roof assembly
• Asphalt-saturated and reinforced for tear resistance during fastening
• Suitable for mechanical attachment to nailable decks with plates and fasteners
• Provides a consistent substrate for hot asphalt, cold adhesive or torch-applied plies
• Supplied in rolls covering 300 square feet of material before laps
• Acts as a separator sheet between the deck and the roofing plies above

Applications

• Low-slope built-up roofing (BUR) assemblies
• Base ply under modified bitumen cap sheets
• Mechanically attached first ply over plywood or plank decks
• Separator sheet over existing roof surfaces in recover work
• Temporary dry-in of a low-slope deck ahead of the finished plies

Product Details

• Type: Roofing base sheet
• Application: Low-slope roof assemblies
• Coverage: 300 sq. ft. per roll
• Sold By: Roll

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