15 Roofing Felt R Value

The 15 pound was for lighter weight projects while the 30 offered more heavy duty protection.

15 roofing felt r value.

The type and amount of roofing felt to apply varies according to roof slope. 0 05 wood 0 94 metal any 0 00 ceramic tile in. R3 r18 r21 total roof r value. 0 20 siding r value per inch r v per unit wood shingles 16in.

15 pounds per hundred square feet and 30 pounds per hundred square feet. Organic dry felt is made from 100 post consumer recycled material. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. If the slope is between 3 12 and 4 12 use two layers of 15 felt for asphalt shingles.

For many years roofers used asphalt saturated felt under roofing shingles and it was historically available in two standard weights. Roofing r value per inch r v per unit roofing felt 0 06 asphalt roll 90 lb 0 15 asphalt shingle 0 44 slate in. 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. If the slope is greater than 4 12 which provides more water drainage from the roof use one layer of 15 felt.

Calculate percent improvement in r value. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.