Roof Felt Paper 15 Vs 30

It is still used as a cheap underlayment but shrinks and wrinkles if it get overnight dew on it or goes through rain.

Roof felt paper 15 vs 30.

No 15 felt and no. 30 pounds per 100 square feet. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. We use the 30 felt paper because i feel it is the best product for your roof.

Felt is commonly sold in either 15 or 30 rolls measuring 36 inches wide. 9 out of 10 found this answer helpful. Roofing felt comes in large rolls and installs in horizontal rows starting at the lower edge of the roof with each subsequent row overlapping the previous one. The type i recommend depends on roof slope.

It is thicker and heavier than the alternative 15 so if water ever gets under your shingles it has to work extra hard to get through the felt. Fyi 30 roofing paper is too thick to use as an underlayment and is no better. This means it is less prone to tearing. Generally speaking roofing felt is a felt paper that is soaked in asphalt and other water resistant compounds to produce a membrane.

It provides more of a barrier to water that may seep between shingles or tiles. 15 is easy to rip underfoot when installing the new roof system and ripped felt paper is useless regardless of weight. The main advantage of using felt roofing underlayment is cost. Of course it is a bit more technical than that but this is the basic idea behind how felt works.

For slopes less than 4 12 i recommend 2 layers of 15. It lays down on the roof sheathing more easily than 15 pound and often has fewer wrinkles. Item 656632 model 0903000. Helps reduce the possibility of leaks.

30 is still asphalt saturated felt and is still safe underfoot and performs much better as a temporary roof as shingles are being applied. 15 is not asphalt saturated felt but rather paper like kraft paper that has a thin asphalt coating on it. 15 roofing paper was the original underlayment for everything. The best weight for roofing felt is the 30 pound product because it provides thicker and stronger footing for roofers that does not tear out especially on steep roofs where footing is critical.

What is roofing felt. 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. Roofing felt in a 30 pound weight is heavier. There are better products but hd does not stock them in every store because everyone uses this 15 roofing tar paper.

Because it s thicker and stronger.