It may eventually go away. Seems to have started to become a problem
when they went to fiberglass roofing shingles. They show every
problem. I had a roof put up after a tear off and had a bunch but
eventually they went away.
In my case it was underneath the felt. Not only did shingle material
change about 20 years ago, so did the felt. I think the felt does not
let air pass thru and so the sun hits it and air expands under it
forming a bubble. Just my theory. Some manufacturers of shingles
started to recommend no felt be used if code did not require it to
avoid the problem but I'd rather have felt with temporary bubble. Of
course we are assuming your bump is the same as what I had.
I am wondering where this air will go. It is winter now and there is a
bubble. I am wondering what will happen in the hot summer days.
When you say eventually they went away.. How many days did it take? Months?
Also did it show up in winter or summer?
Art Begun wrote:
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