Roofing Felt Paper Weights

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.

Roofing felt paper weights.

The weight of roofing constructions above the truss rafter may be estimated with the calculator below. Its main purpose is to prevent moisture from leaking into a roof. This weight of tar paper may tear and tends to create holes around the roofing nails. The best weight for roofing felt is the 30 pound product because it provides thicker and.

The lowest thickness is 15 pound felt. This means that 100 square feet of the felt weighs 15 pounds. None 15 pound paper 0 2 lb m ft 2 1 kg m 2. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights.

Like many paper type products roofing felt paper can be described by its weight or the density or heaviness of the paper. By shifting the pound symbol 15 felt became 15 felt which may actually weigh 7 5 to 12 5 pounds per square. The numbers ihad a correlation to the weight not the thickness. It s purpose is to prevent water from penetrating the roof decking material like plywood or osb oriented strand board used for sheeting roofs.

However that direct correlation to weight no longer exists. For the average home roofing felt that is 15 or 30 pounds will be effective. Felt tar and slag roofing 4 ply 4 8 lb m ft 2 23 4 kg m 2 felt tar and slag roofing. Felt paper is a type of roof underlayment.

30 felt can weigh between 16 and 27 pounds per square. 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. With various benefits you ll want to make sure you re using felt paper for your next roofing project.

Tar paper comes in two different weights or thicknesses. It s required under many building s codes and organizations such as the national roofing contractors association nrca recommend using it for every project. Asphalt impregnated felt paper. 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.

The standard types of felt are 15 and the more waterproof 30.