Roofing Felt Paper Weights

Felt paper is sometimes referred to as roof underlayment or tar paper.

Roofing felt paper weights.

It s purpose is to prevent water from penetrating the roof decking material like plywood or osb oriented strand board used for sheeting roofs. By shifting the pound symbol 15 felt became 15 felt which may actually weigh 7 5 to 12 5 pounds per square. It is placed between the roof decking or sheeting and the roof shingles. The best weight for roofing felt is the 30 pound product because it provides thicker and.

Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe. With various benefits you ll want to make sure you re using felt paper for your next roofing project. The standard types of felt are 15 and the more waterproof 30. Asphalt impregnated felt paper.

The weight of roofing constructions above the truss rafter may be estimated with the calculator below. This means that 100 square feet of the felt weighs 15 pounds. 30 felt can weigh between 16 and 27 pounds per square. Tar paper comes in two different weights or thicknesses.

The numbers ihad a correlation to the weight not the thickness. None 15 pound paper 0 2 lb m ft 2 1 kg m 2. It s required under many building s codes and organizations such as the national roofing contractors association nrca recommend using it for every project. Felt paper is a type of roof underlayment.

Its main purpose is to prevent moisture from leaking into a roof. Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added. Like many paper type products roofing felt paper can be described by its weight or the density or heaviness of the paper. In the past the felt number designation was correlated to the weight of the felt i e a 15 felt weighed 15 pounds 100 square feet.

For the average home roofing felt that is 15 or 30 pounds will be effective. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights. However that direct correlation to weight no longer exists. This weight of tar paper may tear and tends to create holes around the roofing nails.

Felt tar and slag roofing 4 ply 4 8 lb m ft 2 23 4 kg m 2 felt tar and slag roofing.