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