What is the difference between 15 pound and 30 pound felt paer for roofing?

Answer 1

the best reason i can think of is the 30lb felt is denser and when applied over and uneven, older pine roof boards or plywood the density would be able to cover blemishes in the sub roof. Splinters from old nail removal, or other slight imperfections. Ice guard as used in freeze areas is also more durable to puncture...The need to lay the 30lb felt with little or no wrinkles also makes for smooth runoff. the use of correct material is important when the pitch of the roof is reduced hope this helps. jerome

Answer 2

30-pound roofing felt (it is NOT paper--it's made from either fiberglass or polyester that's been bound together with asphalt) costs the same per roll as 15-pound felt, but there are 216 square feet per roll of 30-pound versus 432 square feet for 15-pound, so it costs twice as much to use. My rule of thumb: if you're using three-tab shingles, 15-pound is fine. If you're using architectural shingles, they'll lay better if you put 30-pound felt under them.

Answer 3

The thickness of the paper. 30 lb. is twice as thick.

Answer 4

30 pound is in the same size roll, but covers half as much as 15# and is twice as thick.

Answer 5

30 will last twice as long as 15 BUT it is harder to install on the flashing so your better off using 4 PLY 15 with hot applied bitumen

Answer 6

15 lb refers to the thickness of the paper. Felt is also available in 30 lb .

Answer 7

One is twice as thick. On steeper slope roofs, 30 lb. has less chance of tearing when you walk on it. Less chance of having holes poked in it also before the shingles go on.

Answer 8

30 lb is thicker. That's all.

Answer 9

.016 "

Answer 10

Convert into inches