Roof Shingles Delamination

How to identify types of asphalt shingle roofing failures defects causes photographs of asphalt roof shingle cracking types photographs of organic felt asphalt roof shingle failures shingle cupping curling cracking fishmouthing granule loss asphalt roof shingle blisters and splices photographs black stains on roofing extractive bleeding moss lichens on shingles storm damaged.

Roof shingles delamination.

When the membrane and insulation separate. Delamination can occur over time due to your roof s exposure to uv rays or from improper installation of the original roof. Like blisters delamination can come from improper installation in inclement weather. Incompatible materials will contribute to further shingle delamination.

Flaking is a term often used to describe localized delamination. Worn or weathered asphalt roof shingles which are losing their mineral granules in the course of normal aging if inspected early in the wear cycle already show small areas of granule loss beginning with bald areas on the shingles which may be just the diameter of a few mineral granules. Proximately one inch from each end and the remaining two fasteners near the one third points image 2. Or by anomalies in the manufacturing process that create areas of weakness that fail before the rest of the shingle.

Asphalt based cements should only be applied at the underside of shingles. Flaking is commonly due to the drying and degrading of the asphalt over the years and the differential movement between the bond coating and the saturated coating caused by the repeated shrinkage and swelling from moisture variations and or expansion and contraction from thermal variations. Look for damage to the shingle butts. When the layers of dimensional shingles aren t properly fused they can begin to come apart in just a few months after installation.

Granule loss in a natural path of travel on the roof is usually caused by scuffing from foot traffic. If moisture gets between the membrane of the roof and the shingles this can also cause delamination. If the environment is humid moisture can get trapped between the membrane and insulation. Flaking organic shingles flaking is the delamination of the upper layer of the asphalt which bonds the granules to the lower layer of asphalt that saturated the organic shingle mat.

Deteriorated shingles that show evidence of curling cracking splitting or openings should be replaced with new shingles. This delamination can cause both water and wind damage to the existing roof.