Great pic Greg. Isnt it funny that the funk was growing in the pattern of the truss. That means that area of the roof has no moisture barrier or felt underneath possibly.

AC

Doug Rucker wrote:

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AC I ahve noticed on some roofs around here the shingles look like they are bubbling, and these are on newer roofs. Mostly Apartment Complexes less than 2 years old.
It will have small little waves or raised "bubble looking" areas to it. Ane idea what that is caused by.?

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 Large areas of shingles with a bubble underneath or small blisters on individual shingles?

AC

Doug,

I have seen roofs have large bubbles of 20 to 100 square feet where it seems like the shingles are no longer attached and air has worked up under them. Almost as if they used staples and they rusted away or were too short and the roof is now just held together by the tar, glue strips on the shingles.

Another condition is where some num nuts out there have tried using acid to clean the roofs and they actually blister the roofs with dime to quarter size bubbles on the shingles.

Either fit the description???

AC