Felt Paper Vs. Asphalt Paper on Roofs

Materials

• Felt paper and asphalt paper used in roofing are basically the same thing. Making a distinction between the two is not necessary, because both are often used interchangeably. This occurs because, in reality, they are one and the same and can be used to serve as a roofing underlayment. Felt paper is made from a fiberglass fleece soaked with tar and other materials used in asphalt designed to prevent water from seeping through and getting to the plywood underneath.

Types

• Asphalt and felt paper used in roofing comes in two basic forms, or weights. It is usually designated based on its weight per 100 square feet; usually 15-pound or 30-pound paper. The 30-pound paper is typically regarded as being more heavy-duty. Most homes are generally built with the 15-pound paper, but the 30-pound paper is generally preferred when doing roofing repairs.

Alternatives

• Although felt asphalt paper is still widely used by some contractors, some contractors have abandoned the use of this type of paper in favor of an even more durable synthetic paper that is both lighter and easier to install. The synthetic materials are also less susceptible to damage by various types of vermin and insects. Synthetic materials tend to be resistant to ultraviolet ray damage, whereas the felt asphalt paper is not.

Installation

• Despite its disadvantages in comparison to synthetic underlayments, felt paper still tends to be a viable option for many homeowners because it is both economical and fairly easy to install. Installation differs little from synthetic underlayments and can be accomplished in the same manner. This usually involves rolling out the paper and removing the self-adhesive backing cover so that the paper can bond with the roof. However, this type of paper can be stiff and somewhat difficult to roll out. It can also tear and needs to be handled with a great deal of care.