Flashing cement is a heavy-bodied asphalt mastic used to seal and bond roof flashings, laps and repairs. It trowels on thick, clings to vertical and overhead surfaces without sagging, and cures to a flexible, weather-resistant seal that moves with the roof rather than cracking away from it.

Supplied in a one-gallon pail for hand application with a trowel or putty knife. Typical work includes bedding and sealing metal flashing at walls, chimneys, curbs and vent stacks, patching splits and blisters in built-up or modified bitumen roofing, and sealing around fasteners and laps on rolled roofing.

Key Features

• Asphalt-based mastic formulated to seal roof flashings, laps and penetrations
• Heavy, trowel-grade consistency that holds on vertical and overhead surfaces
• Cures to a flexible, water-resistant seal that tolerates normal roof movement
• Bonds to metal flashing, asphalt shingles, roll roofing and built-up membranes
• Applied by trowel, putty knife or caulking blade with no mixing required
• One-gallon pail sized for repair work and flashing details

Applications

• Sealing base and counter flashing at walls, chimneys and parapets
• Bedding metal flashing at curbs, skylights and vent stacks
• Patching splits, blisters and open laps in built-up or modified bitumen roofing
• Sealing exposed fastener heads and end laps on rolled roofing
• Spot repairs to shingle roofs at valleys and eaves
• Sealing around pipe boots and roof penetrations

Product Details

• Type: Flashing cement
• Category: Roofing accessory
• Container Size: 1 gallon
• Application: Trowel or putty knife

Specifications

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• Lead times vary based on availability and order size

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