15 Or 30 Pound Roof Felt

For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights.

15 or 30 pound roof felt.

Historically roofing felt paper was named for weight. Organic dry felt is made from 100 post consumer recycled material. In my opinion felt paper is a vapor barrier plus keeps the oils in the shingles from leaching out and into the wood substrate i e. The main advantage of using felt roofing underlayment is cost.

15 pounds per hundred square feet and 30 pounds per hundred square feet. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. One roofing square and 30 lb felt paper weighed 30 pounds per square. 15 came perforated for use as a ply sheet for built up roofing.

Felt roofing underlayment is typically available in two types. 30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events. In the old days common felt was 15 lb felt and 30 lb felt and a roll of the first held 4 squares and weighed 60 lbs while a roll of the second held 2 squares and weighed 60 lbs. The best weight for roofing felt is the 30 pound product because it provides thicker and.

This 15 felt roof deck protection features quality asphalt saturation for great waterproofing to add an extra layer of protection between your shingles and your roof deck. 15 lb felt paper weighed 15 pounds per 100 sq. Item 656632 model 0903000. Asphalt saturated heavy duty roofing felt is available in 15 and 30 pound weights.

Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof the type i recommend depends on roof slope. Roofing underlayment 15 lb felt. The difference between 15 lb and 30 lb roofing felt paper. 15 astm 4869 type i is an authentic 15 astm 4869 type i is an authentic asphalt saturated organic felt underlayment is used as a breathable secondary weather resistant barrier when applied over the roof deck prior to the installation of the primary roofing product.

Felt paper is commonly produced with a certain number of recycled products and coated with asphalt. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.