What is Roofing Felt?
Roofing felt is a building material that is essentially a thick paperboard product saturated with asphalt. It is supplied in rolls, and is often coated with mineral grit on both sides to keep the layers from sticking together. It comes in several weights, with 15-lb. being commonly used. Some types of roofing felt have at times been made with asbestos paper. The use of asbestos added to the moisture, pest, and flame-resistance quality of the roofing felt material. Asbestos roofing felt can be used under shingles to provide a moisture barrier, but is more frequently used to construct a “built-up” flat roof system.
