21 Aug

What is shingle roof blistering?

roof blistering, asphalt shingle blisteringWith as many surprise hail storms as we get in North Texas, it’s easy to assume that visible black pockmarks on your asphalt shingle roof are the result of hail damage. But this isn’t always the case. Another common shingle issue seen in Austin and the Dallas-Fort Worth Metroplex is blistering. So how do you tell the difference?

Hail damage versus shingle blistering

When you look closely at one of the dark circles, hail damage leaves indentations. Blisters pop outwards. Additionally, severe hail penetrates through the granules, asphalt and backing while blistering only affects the granule and asphalt layers.

What is roof blistering

Roof blistering is a result of shingles superheating and either air or moisture trapped in the shingles coming to the surface. When this occurs, the asphalt on the shingle bubbles. When the bubbles break open, the granules are loosened and either fall off or are absorbed into the liquified asphalt.

There are multiple reasons for blistering. The most common thing we see at Peak Roofing & Construction in Dallas is poorly ventilated roofing systems. When airflow under the roof’s surface is insufficient, the roof overheats. Improperly vented attics reach 130 degrees or more during the heat of summer. At the same time, the shingles are absorbing heat from the sun. Together they provide more heat than the shingle can bear.

The other cause of blistering is poor manufacturing. If moisture gets trapped in the shingles’ layers or too much asphalt is applied, bubbles can form. However, with technology advancements in the manufacturing process, this rarely occurs in newer shingles, especially those installed by an experienced roofer.

Is blistering cosmetic or functional damage?

It depends on the severity of the blisters. If the blisters are small and few, it is likely cosmetic. However, if the blisters are large and have removed a significant percentage of the granules, there is a definite reason for concern. Even if it is cosmetic at this point, it ultimately affects the life expectancy of the roof.

What if you have blistering shingles?

If you have blistered shingles, start by contacting a reputable Dallas-Fort Worth roofer. Experienced roofers can provide an expert opinion based on inspecting hundreds of roofs. The other option is hiring an independent, licensed adjuster to inspect the roof. If the damage is caused by poor manufacturing, your warranty should cover replacing the materials. Not to dwell on it, but here is where using a reputable roofer comes into play again. For instance, Peak Roofing & Construction guarantees both our products and workmanship. Many roofers will charge you for the labor to replace the shingles even when the materials fail. If the damage is significant and caused by hail, your homeowners insurance should cover the damage, but it’s unlikely they will cover blistering.

If you suspect you have roof damage of any kind, call Peak Roofing & Construction. Our professionals provide free inspections and can help steer you in the right direction based on the type of damage they see. With 30 years’ experience repairing hail damage, roof blistering, roof rot and everything beyond, we’ve truly seen it all.

About Peak Roofing & Construction

Peak Roofing & Construction is family-owned, with 30-years of experience. Bonded, insured and accredited, we provide roofing, gutter, fence, window and exterior facelift services. Guaranteed. Call (972) 335-7325 in Dallas-Fort Worth (residential & commercial) or (512) 415-6888 in Austin (residential roofing).

Mary Beth Barnett


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