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Rockland County Roofing: Article About Shingle Blistering

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Rockland County roofing professionals commonly see asphalt shingles that are plagued with blistering. There are two primary reasons why blisters form on asphalt shingles. The first is trapped moisture, and the second is poorly vented roofs.

Moisture and gases from volatile organics or resins can get trapped inside the shingle while it is being fabricated. This leads to blistering because as the sun beats down on a shingle and heats it up, the moisture inside the shingle heats as well and expands, leading to blister formation. Roofs with poor ventilation get very hot because of heat built up in the attic. This heat affects shingles, causing them to blister. In rare circumstances, installers may use excessive amounts of adhesives during the roof installation, which can cause also blistering.

Sometimes blistering shingles are bad thing, and sometimes they are not. If a shingle blisters but does not lose its granules, it will not cause a serious problem for the roof. However, when blisters pop, the granules that provide UV protection to the shingles fall off the asphalt, leaving the shingles open to UV rays. Once this happens, the shingles will lose more and more granules, can weaken and can gradually become a source of roof leaks and damage.

Avoid walking on blistered shingles to prevent them from popping.

The roofing experts at Precision roofing of Rockland County can answer questions regarding asphalt roofing or TPO roofing.

Debris falling from nearby trees such as pine cones, tree limbs or acorns may cause blisters to pop. Hailstorms will definitely pop blistering shingles, but there is very little that homeowners can do to prevent this from happening. Some choose to replace the asphalt shingles before the blisters rupture. Depending on the amount of shingles that are damaged, this can be an expensive fix.

Homeowners may find it difficult to distinguish between blistering and hail damage. However, there are a few things that set these two types of damage apart. The first thing is the location of the damage on the roof. If the damage is scattered throughout the roof, it is likely the result of blistering. Hail damage usually happens on one slope of the roof and is uniform in appearance. This is because of the direction of the wind during a hailstorm.

Some asphalt shingles come delivered with bumps or blisters, or some begin to blister shortly after being installed on a roof. It is not uncommon for these blisters to form shingle pits that leave the asphalt substrate of the shingle exposed. Shingles in this condition will need to be replaced as they are susceptible to water penetration and freeze during thaw cycles.

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