15 is easy to rip underfoot when installing the new roof system and ripped felt paper is useless regardless of weight.
Roof felt paper 15 vs 30.
Helps reduce the possibility of leaks.
It provides more of a barrier to water that may seep between shingles or tiles.
For slopes less than 4 12 i recommend 2 layers of 15.
What is roofing felt.
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.
30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events.
15 roofing paper was the original underlayment for everything.
We use the 30 felt paper because i feel it is the best product for your roof.
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.
Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.
Item 656632 model 0903000.
Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof.
Felt is commonly sold in either 15 or 30 rolls measuring 36 inches wide.
It lays down on the roof sheathing more easily than 15 pound and often has fewer wrinkles.
This means it is less prone to tearing.
Fyi 30 roofing paper is too thick to use as an underlayment and is no better.
30 is still asphalt saturated felt and is still safe underfoot and performs much better as a temporary roof as shingles are being applied.
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.
The main advantage of using felt roofing underlayment is cost.
The type i recommend depends on roof slope.
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.
Roofing felt in a 30 pound weight is heavier.
Of course it is a bit more technical than that but this is the basic idea behind how felt works.
Felt roofing underlayment is typically available in two types.
It is still used as a cheap underlayment but shrinks and wrinkles if it get overnight dew on it or goes through rain.
Generally speaking roofing felt is a felt paper that is soaked in asphalt and other water resistant compounds to produce a membrane.
15 is not asphalt saturated felt but rather paper like kraft paper that has a thin asphalt coating on it.
No 15 felt and no.
