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Using too much bituminous mastic or roofing cement can cause blistering. The use of mastic which is not compatible with bituminous shingles can also lead to blistering.

Solution:

Blisters can disappear after some period. If they are already opened, it’s better to change these affected shingles.

Some roofers will cut shingles into pieces and use these pieces for the hip and ridge cap, regardless of which shingle is being used on the roof. With 3-tab, 4-tab, hex and diamant shingle this is the correct process. If this is done correctly, the shingle is cut into three even pieces (4-tab shingles in 4 pieces) that are flexible enough to use as a cap shingle. Do not use beaver shaped shingles for capping because they are too narrow and don’t cover hip or ridge enough!

The popularity of laminated shingles is increasing, but many roofers are making the mistake of following the same process you would with a 3-tab. The thicker Cambridge shingles are not designed for ridge caps. They do not lay flat and some may crack or break when you bent them over the ridges. It is highly recommended to use only a 3-tab shingle that matches the color of the laminated shingle.

Solution:

If your roof suffers leaking problems through the cap shingles it is necessary to change them with rectangular shape capping.