Roof Felt Rippling

Those ripples bumps can be pressed down easily which suggests that there is space between the shingle and decking i e shingles are not properly supported by the decking where there are ripples.

Roof felt rippling.

The shingles on your roof serve a dual purpose. Roofing underlayment or felt helps prevent unevenness in the roof sheathing from telegraphing through the shingles. Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment. Roof shingles are not lying flat.

If during the roof installation sealing was not done using foam or it was done improperly it could be problematic in the future. Roofing professionals agree that a rippling roof is a sign that a home needs to be reroofed as soon as possible. Moisture from the house will get in between the panels and absorbed by the felt. The felt with then expand and wrinkle pushing the shingles up causing the rippling effect.

In high humidity materials may bulge or wrinkle causing ripples and bumps on the exterior surface of your roof. They give the roof a finished look while forming a protective seal. Lumpy bumpy or curling shingles that do not. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.

Roofing underlayment or felt protects the roofing from any resins that bleed out of the sheathing. Item 656632 model 0903000. One can see clearly lots of ripples bumps all over the roof but one section is much worse than the rest.