Rain On Tar Paper Roof

Felt is compressed fibers of wool.

Rain on tar paper roof.

Roofing felt is made of compressed polyester or fiberglass fibers. It is typical for the roof to be in this condition for 30 60 days while other phases of the construction are completed. Any repairs would be his problem. Traditional roofing felt also called tar paper or underlayment is felt saturated with bitumen also called asphalt.

It sounds like the tarpaper covering this is the old tar paper correct. Our osb is rated exposure 1 and that means that it will withstand normal delays in construction. When tar paper gets wet it buckles and ripples. I wouldn t trust it in the rain but it s not my job.

Certainly it would have been better to have covered the roof with a tarp or roofing felt before it rained. Osb like all other wood will expand. Bitumen or asphalt is distilled from petroleum and is what makes roofing felt waterproof. The top is protected from the sun by stone granules but there is no such protection on the underside.

Over a long and i mean long period of time the sun heat will dry out the. By carlye jones roofing felt also known as tar paper serves as both an extra layer of protection between the shingles and the plywood and as a temporary moisture barrier until all the shingles.