Rain On Tar Paper Roof

Bitumen or asphalt is distilled from petroleum and is what makes roofing felt waterproof.

Rain on tar paper roof.

Any repairs would be his problem. 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. Felt is compressed fibers of wool.

Over a long and i mean long period of time the sun heat will dry out the. It is typical for the roof to be in this condition for 30 60 days while other phases of the construction are completed. Roofing felt is made of compressed polyester or fiberglass fibers. Traditional roofing felt also called tar paper or underlayment is felt saturated with bitumen also called asphalt.

Normal delays and the rain you indicated will not affect the structural properties of the panels. When shingles are placed on top of rippled tar paper voids are created which act as little greenhouses that collect heat and break down the shingle from the underside. I wouldn t trust it in the rain but it s not my job. When tar paper gets wet it buckles and ripples.

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.