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4 Reasons Why Asphalt Shingle Roofs Blister

Asphalt shingles are one of the most popular roofing materials on the market because of their durability and long lifespan. Unfortunately, like any other roof, asphalt shingles can sustain damage earlier than expected.

Here’s everything you need to know about blistering in asphalt shingle roofs – what causes them and how they can be prevented or fixed.  

What Are Asphalt Shingle Blisters?

Blisters on asphalt shingles occur when pockets form as a result of a loss of adhesion, creating raised bubbles on the roof surface. When this happens, the granules become dislodged, and the exposed matting no longer protects against moisture and the sun’s ultraviolet (UV) rays. Continuous exposure to the elements leads to the rapid deterioration of the affected shingles. 

What Causes These?

  1. Trapped Moisture 

If moisture gets trapped in the shingle during the manufacturing process, blisters will likely form on the roof shortly after it’s installed on a roof. As the sun heats the moisture trapped in the shingle, it rises to the top, forming blisters on your roof. 

  1. Inadequate Ventilation 

The more common cause would be inadequate ventilation. Without adequate ventilation, the temperature of your roof and attic will inevitably increase. Too much heat can cause the shingles to blister.

  1. Poor Roof Ventilation

A roof that has poor ventilation can get pretty hot. It can reach a point where the heat is so high that shingles will deform and blister outwards. A professional roofer may add extra vents and insulation to ensure proper attic ventilation. 

  1. Intense Heat

Excessively high temperatures will eventually take a toll on shingles’ materials. 

How to Prevent Blisters 

Choosing quality asphalt shingles during a new roof construction can help prevent blisters as good shingles may be durable enough to at least avoid blister popping. Once the vapors contract or the moisture evaporates, the blisters should just disappear without causing any real damage to the roof. 

Attic ventilation is a major point you should address. Blistered shingles can be replaced, but if the main cause isn’t solved, you’ll likely have the same problems in the future.

It’s best to stick to reputable brands when choosing a new roof. And, to ensure your roof is properly installed, make sure only certified roofers handle the task.

No matter which shingle brand you select for your roof replacement, you can trust Jack the Roofer for expert installation and service after the sale. We offer roofing maintenance and roof repair whether we installed the roof or not. Call us today at (720) 807-4715, or fill out our contact form to get started with a free estimate. We serve clients in Castle Rock and Parker.