Putting the paper down doesn't hurt, so I always do it, but you would have to do a really lousy job for it to help. The only time I can see it really helping, after the shingles are on, is if you have a massive tear off due to a storm.
I frequently leave a new roof in tar paper for several weeks before I can schedule time to put the shingles on. That is the real use for tar paper in roofing. I never use the lines on the paper. I layout the roof myself, using a chalk line to mark out the courses. -Chuck Harris [email protected] wrote:
I think tar paper basically has two functions these days- it's a cheap backup in case the roofers don't install correctly, and the lines on the paper are used as a guide to install the shingles.
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