15 roofing paper was the original underlayment for everything.
Roof felt paper 15 vs 30.
It provides more of a barrier to water that may seep between shingles or tiles.
Helps reduce the possibility of leaks.
Fyi 30 roofing paper is too thick to use as an underlayment and is no better.
15 is not asphalt saturated felt but rather paper like kraft paper that has a thin asphalt coating on it.
The type i recommend depends on roof slope.
15 is easy to rip underfoot when installing the new roof system and ripped felt paper is useless regardless of weight.
It lays down on the roof sheathing more easily than 15 pound and often has fewer wrinkles.
What is roofing felt.
There are better products but hd does not stock them in every store because everyone uses this 15 roofing tar paper.
No 15 felt and no.
Item 656632 model 0903000.
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.
30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events.
For slopes less than 4 12 i recommend 2 layers of 15.
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.
Plywood or osb roof deck so 15 20 or 30 will work for any shingle roof.
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.
Generally speaking roofing felt is a felt paper that is soaked in asphalt and other water resistant compounds to produce a membrane.
30 pounds per 100 square feet.
30 is still asphalt saturated felt and is still safe underfoot and performs much better as a temporary roof as shingles are being applied.
This means it is less prone to tearing.
Of course it is a bit more technical than that but this is the basic idea behind how felt works.
Because it s thicker and stronger.
Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.
It is still used as a cheap underlayment but shrinks and wrinkles if it get overnight dew on it or goes through rain.
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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.
