No. 15 asphalt-saturated felt is the traditional organic or fiberglass mat sheet saturated with asphalt and supplied in rolls. It is installed over a roof deck ahead of shingles as a secondary water-shedding layer and a separation sheet between the deck and the finish roofing.

The sheet is rolled out horizontally from the eave up, lapped shingle-fashion so water runs over each seam, and fastened with roofing nails, cap nails or staples depending on the deck and local practice. The lighter No. 15 weight is the common choice under asphalt shingle work, where No. 30 is reserved for heavier or steeper assemblies.

Beyond roofing, felt paper is widely used as a slip sheet and a weather-resistive layer behind siding, stucco lath and masonry veneer, and as a temporary dry-in while a building is being closed up.

Key Features

• Asphalt-saturated felt sheet supplied in rolls for continuous coverage
• No. 15 weight, the lighter of the two standard roofing felt classes
• Sheds water as a secondary barrier beneath shingles and other finish roofing
• Cuts with a utility knife and tears cleanly at the fastener line if overdriven
• Fastens with roofing nails, cap nails or staples over wood decking
• Acts as a separation layer between the deck and the roof covering
• Lays flat and conforms over valleys, hips and minor deck irregularities

Applications

• Shingle underlayment on sloped wood-decked roofs
• Temporary dry-in of a roof deck during construction
• Weather-resistive layer behind wood, fiber cement or vinyl siding
• Backing behind stucco lath and masonry veneer walls
• Slip sheet between dissimilar materials
• Patch and repair work on existing shingle roofs

Product Details

• Type: Roofing felt underlayment
• Weight Class: No. 15
• Material: Asphalt-saturated felt
• Form: Roll
• Application: Roof decks, wall sheathing

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