You folks from soggy climates, please don’t snicker. I’m roofing in Southern California, and got the roof covered in 30-lb. felt just in time to dodge the first major winter storm of the season.
Now the underlayment is saturated, and has some large wrinkles, one of which telegraphs through a section of partially shingled roof. I’m applying 40-year dimensional asphalt shingles.
How long does the underlayment need to sit in the sun before it dries out and flattens out (if ever?) Will the section under the shingles ever flatten out on it’s own? The substrate is OSB, and the house underneath is still in framing stages.
Replies
Dryrot,
I have that same problem for the storm on Monday. Only difference is mine is on a deck surface (subfloor). I had it tarped up and water still got underneath it. The homeowner said the rain was coming down sideways! Anyway I was out on the job today and untrarped the deck surface. I am going to let it dry for a day and then cover it with 15# felt until we have enough dry weather to put the surface down.
I was surprised to see that it had dried some in the day or so since the rain hit. When we use the jumbo tex for weather proofing sidewalls and it gets wet it rarely ever straightens out. Usually has to be replaced because the waves come through on the wall surface. I assume the roofing paper is a similar deal. 30# felt is much heavier than jumbo tex though. Let it sit in the sun for a day and see what happens. More rain is on the way on Friday, Saturday and Sunday.