Chesapeake Roofers: Article About Buckling Roof Shingles
When roof shingles buckle, it often appears as if one or more shingles have formed ripples. This keeps the affected shingles from laying flat against the underlayment and roof decking. Not only is it not particularly appealing, it also indicates that there is something wrong with the roofing system. When the shingles do not lay flat, moisture, insects and rodents can potentially make their way into the interior roof components and the attic. Chesapeake roofers may potentially help identify if the shingles have begun to buckle.
Buckling is likely to occur if the roofing felt or tar paper is not installed correctly. If the felt is not stretched as it is applied to the roof decking, portions of the felt can buckle, causing the shingles to buckle as well. Similarly, a wrinkled underlayment can also cause the shingles to buckle. The underlayment, which is attached to the underside of the shingles, must also be laid flat to keep the shingles from moving.
Poor ventilation is also a common cause of buckling. Poorly ventilated attics are likely to build up heat and moisture.
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The heat and moisture often escapes from the attic space through decking; however, it can become trapped underneath the underlayment and the shingles. This can cause the outer roofing materials to warp over time.
Movement of the roof deck can also give the shingles a rippled look. The roof decking consists of plywood sheets that are normally fastened to the roof's rafters or trusses; however, if this step is missed, the deck pieces may actually move. This can ultimately cause the roof shingles to warp and rise over each other.
Finally, buckling often occurs when homeowners attempt to install a new layer of shingles over the old layer of shingles. A roof overlay can be problematic if the original roof has reached the end of its lifespan and was not lying flat. Shingles need a flat surface to attach to; attempting to nail down a new layer of shingles on an uneven or broken surface will only allow moisture to get into the roof system and will result in buckling. Eventually, both roofs will have to be torn off.
Unless the buckling has resulted from the installation of a second layer of shingles over an existing roof, buckling shingles usually indicate poor installation. If the roof was installed by licensed and professional roofers, the materials and the work may still be under warranty.