Roofing Felt Under Cement Board

Roofing underlayment or felt protects the roof deck from rain before the roofing is installed.

Roofing felt under cement board.

After the subfloor is down roll out either felt paper or rosin paper starting next to the longest wall. When to use roof underlayment no matter what type of asphalt shingle you are using whether traditional or more robust styles such as under premium designer architectural and performance shingles it is recommended to use a underlayment. All you need to do is tack it up or staple it. But over the underlayment along the rake edges of the roof.

Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. The lightest cement board in the industry is ideal for use as a cover board in system applications such as liquid applied membranes or as a parapet fire or thermal barrier roof board. Understanding the proper way to install the drip edge will only get you so far.

Behind the green board thats above your cement board wont hurt but you don t need to. Felt paper comes in 15 pound and 30 pound options. According to most building codes and manufacturer recommendations the drip edge should be installed beneath the underlayment along the eaves of the roof. Having a layer of roof felt will block the resin preventing it from staining or compromising your roof shingles.

Roofing underlayment or felt protects the roofing from any resins that bleed out of the sheathing. Does drip edge go over or under felt. Item 656632 model 0903000. Yes you ll need to put the felt just behind the cement board.

Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.