The Reasons Behind Rippled Asphalt Shingles

Wavy or rippled asphalt shingles can affect both old and new roofs. If you’ve just installed a new roof, the shingles will usually look a bit lumpy. They should lie flat within a couple of warm days. On the other hand, if your roof is fairly old and the shingles look wavy for more than a few days, it’s best to have it inspected by a professional roofing contractor right away.  

Here are the common culprits behind rippled asphalt shingles. 

Improper Installation

The decking or sheathing, which is often made of oriented strand board (OSB) or plywood, covers the roof’s structure and supports the weight of the roofing materials. Ripples on asphalt shingles can occur if the decking is installed without a gap between the boards for expansion and contraction, or if it’s exposed to moisture before it’s attached to the rafters and trusses. Warping can also happen if the plywood isn’t fastened properly. Since the fasteners missed the framing, nothing is holding the plywood down, causing it to warp. Sheathing and framing issues require immediate attention.

Damaged Underlayment

The underlayment material underneath the shingles should not be exposed to wet weather or morning dew to prevent it from wrinkling. That’s why professional roofers postpone roof installations during inclement weather. Once the weather clears, they’ll have to make sure that the underlayment material is dry before installing the shingles. If they stapled down the new shingles while the material is still wet, the new shingles may likely look wavy.

Roof Leaks

Leaks don’t become obvious at first. That’s because water seeps through the roof so slowly that water damage isn’t immediately apparent. Leaks may occur for many reasons, such as clogged gutters. First, the leaks will penetrate the shingles, pooling on the underlayment for weeks or months before making its way eventually through the decking and into your home. No thanks to the trapped moisture layer, the shingles surrounding the leak will begin to warp and buckle. 

Inadequate Ventilation

A well-ventilated attic should allow moisture to escape through the roof vents. However, if there is inadequate venting, the moisture will condense on the underside of the decking boards. The moisture will then seep through and affect the shingles. The shingles will not only be rippled, but the decking may also warp. In this case, you should consider improving the ventilation system in your attic space. 

Looking for professional roofing contractors? Get in touch with Paddy’s! We are happy to repair or replace damaged roofing shingles or decks. Give us a call at (302) 388-3625, or fill out our online contact form to set an appointment.

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