Roofing Felt Paper Weights

30 felt can weigh between 16 and 27 pounds per square.

Roofing felt paper weights.

The numbers ihad a correlation to the weight not the thickness. Tar paper comes in two different weights or thicknesses. It is placed between the roof decking or sheeting and the roof shingles. Roofing felt also called roofing felt paper is underlayed on roofs before shingles are added.

The lowest thickness is 15 pound felt. 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. The best weight for roofing felt is the 30 pound product because it provides thicker and. Asphalt impregnated felt paper.

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 tar and slag roofing 4 ply 4 8 lb m ft 2 23 4 kg m 2 felt tar and slag roofing. This means that 100 square feet of the felt weighs 15 pounds. For the average home roofing felt that is 15 or 30 pounds will be effective.

Like many paper type products roofing felt paper can be described by its weight or the density or heaviness of the paper. None 15 pound paper 0 2 lb m ft 2 1 kg m 2. Its main purpose is to prevent moisture from leaking into a roof. The weight of roofing constructions above the truss rafter may be estimated with the calculator below.

Felt paper is a type of roof underlayment. It s purpose is to prevent water from penetrating the roof decking material like plywood or osb oriented strand board used for sheeting roofs. The following table provides typical weights dead load self weight for various roofing materials where possible the values were taken directly from manufacturer technical data sheets and are the actual weights of specific representative products. 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.

Felt paper is sometimes referred to as roof underlayment or tar paper. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights. With various benefits you ll want to make sure you re using felt paper for your next roofing project. There are lighter weight felts available.

By shifting the pound symbol 15 felt became 15 felt which may actually weigh 7 5 to 12 5 pounds per square.