How To Use Roofing Felt

Roofing felt acts as a waterproof barrier between the sheathing and the roofing material shingles etc.

How to use roofing felt.

Roofing felt that provides the best shielding and allows the roofer to walk on it without ripping it is the option roofers most often choose. It is necessary to apply the roofing felt tar paper to a clean dry surface immediately after the sheathing is completed to protect it from the weather. It is used for temporary roofing for weatherproofing and as an underlayment under shingles or other permanent roofing materials. Align this layer with the bottom of the roof.

Overlay a second layer of felt 2 to 3 inches and fasten it through the overlay so it secures the top of the felt underneath. Before applying roofing you ll need to cover the sheathing with roofing felt also often called tar paper most local codes call for using 30 pound felt. Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive. We recommend using 15 30 lb.

Also known as tar paper roofing felt originated in finland in the 1870 s as a waterproofing underlayment for roofs. Weight matters asphalt saturated heavy duty roofing. These thick layers of roofing felt are installed by heating the back of the felt with a butane torch and then carefully applying it to the roof. Taking the time to properly prepare the sheathing will make all the difference in how quickly and easily the felt paper is installed.

Whatever your reason for attaching roof felt you should only do it after cutting your pieces to. Snap a chalk line the. Roof felt also known as tar paper is a waterproof fiberglass product. Today glass fiber or polyester fabric may be used instead of paper.

Roofing felt may be necessary for use with your shingles to meet a class a fire rating when shingles are evaluated for their fire ratings it is done on a small test deck with the roofing felt underlayment in place without this underlayment the shingles alone may not meet the class a fire requirements.