Small holes almost like cigarette burns in roof

I was on a roof and on one side of the valley and only this one side were these little holes that look like burn holes. The roof itself is completely worn out and these holes were only six to eight inches up from the valley on one side. It seems rather isolated to be hail damage. Does anybody have any ideas? I’d really like to know for future.

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Roy not that I doubt you do don’t take it this way, but what would cause blistering in such a weird localized area only in that valley from top to bottom six to eight inches high?

One of the most likely is inadequate attic ventilation in those areas.


What Roy said and the orientation to the sun, the heat is concentrated in the valley.


Frequently seen where shingles lay on top of metal flashing too.


Would fireworks do that? A wayward bottle rocket lands onto the roof, it falls into the valley before it’s done burned off all it’s powder, sits there burning for a couple seconds, doesn’t leave a scorch mark just burns holes, etc?

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Including the additional layers of shingles from weaving. Can you say additional reasons to overheat and blister!?

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The scaredy cat helper came on the roof to meet the foreman wearing golf shoe…before he got yelled at… :rofl:

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What Roy said

My roofer says those pock-marks are the result of a manufacturer defect.

Where are you located at? Reason I ask is that in Colorado we see this when shingles are put on during the colder winter months due to freeze thaw effect. It’s causes the shingles to blister like this.

I live in Central Oregon it gets 100 in the summer and can get in the negatives in the winter at night. This is on a manufactured home though.

True to some degree, but it’s not functional damage… cosmetic only. Gas forms at the mat and rises out of surface asphalt. Once the caps weather away you can see the mat.
Mastering Roof Inspections: Blisters in Asphalt Shingles