Roof Felt Paper 15 Vs 30

Because it s thicker and stronger.

Roof felt paper 15 vs 30.

It lays down on the roof sheathing more easily than 15 pound and often has fewer wrinkles. 15 roofing paper was the original underlayment for everything. The type i recommend depends on roof slope. 30 pounds per 100 square feet.

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. What is roofing felt. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. 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.

Felt roofing underlayment is typically available in two types. We use the 30 felt paper because i feel it is the best product for your roof. 30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events. There are better products but hd does not stock them in every store because everyone uses this 15 roofing tar paper.

9 out of 10 found this answer helpful. 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. 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.

Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof. Generally speaking roofing felt is a felt paper that is soaked in asphalt and other water resistant compounds to produce a membrane. Item 656632 model 0903000. For slopes less than 4 12 i recommend 2 layers of 15.

Helps reduce the possibility of leaks. 15 is not asphalt saturated felt but rather paper like kraft paper that has a thin asphalt coating on it. 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. Felt is commonly sold in either 15 or 30 rolls measuring 36 inches wide.

Fyi 30 roofing paper is too thick to use as an underlayment and is no better. It provides more of a barrier to water that may seep between shingles or tiles. No 15 felt and no. 15 is easy to rip underfoot when installing the new roof system and ripped felt paper is useless regardless of weight.

This means it is less prone to tearing.