15 Or 30 Pound Roofing Felt

Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof the type i recommend depends on roof slope.

15 or 30 pound roofing felt.

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. The best weight for roofing felt is the 30 pound product because it provides thicker and. 15 lb felt paper weighed 15 pounds per 100 sq. The most commonly used felts are 15 and 30 with weights of 8 and 20 pounds per 100 square feet respectively.

Roofing underlayment 15 lb felt. Roofing felt s thickness is not a measurement of its depth because it is thin similar to heavy paper. Felt roofing underlayment is typically available in two types. Organic dry felt is made from 100 post consumer recycled material.

Felt paper is commonly produced with a certain number of recycled products and coated with asphalt. The choice of 15 or 30 pound felt paper is up to you. The difference between 15 lb and 30 lb roofing felt paper. Historically roofing felt paper was named for weight.

The main advantage of using felt roofing underlayment is cost. 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. 30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events.

15 pounds per hundred square feet and 30 pounds per hundred square feet. 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. For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights. Since 30 pound paper is quite a bit thicker you might want to use underneath upstairs flooring applications where the sounds of footsteps can be heard more frequently throughout the house.

No 15 felt and no. Roofing felt s thickness is actually measured in pounds per square with one square equaling 100 feet of roofing material. The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.