Roofing Felt Under Cement Board

Installing building paper is a simple task.

Roofing felt under cement board.

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. Having a layer of roof felt will block the resin preventing it from staining or compromising your roof shingles. Does drip edge go over or under felt. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.

Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes. 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. After the subfloor is down roll out either felt paper or rosin paper starting next to the longest wall.

Roofing underlayment or felt provides an extra weather barrier in case of blowoffs or water penetration through the roofing or flashings. All you need to do is tack it up or staple it. 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. Behind the green board thats above your cement board wont hurt but you don t need to.

According to most building codes and manufacturer recommendations the drip edge should be installed beneath the underlayment along the eaves of the roof. Felt paper comes in 15 pound and 30 pound options. As a cover board securock brand cement roof board can be used with a variety of membranes and systems. Roofing underlayment or felt protects the roofing from any resins that bleed out of the sheathing.

Yes you ll need to put the felt just behind the cement board.