Any ideas?

[palmettoinspect]

The house I did today was built in 2006. The roof covering is 20 year 3 tab asphalt shingles. In the pictures you can see noticeable bumps on the shingles. After scrapping one off I could tell it’s actually the asphalt granules bunched together. My guess would be something was wrong at factory and caused the granules to bunch together like this. Has anyone ever seen this or have any idea what caused it? Does anyone see an issue with this? As always your thoughts and opinions are appreciated.

Thanks,

Kiel

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[Inspectorjoe]

Rash blisters.

https://www.inspectorsjournal.com/forum ... C_ID=10643

https://www.inspectorsjournal.com/forum ... IC_ID=4308

[palmettoinspect]

http://www.inspectapedia.com/roof/Aspha ... isters.htm

Thanks! I should’ve done a Google search first. This is the first time in 5 years I've come across this. Is it common?

[Inspectorjoe]

As a very rough guesstimate, I see it in maybe 1 out of 100 asphalt shingle roofs.

[palmettoinspect]

Thanks Joe!