What are Roof Blisters and Do You Have Them on Your Roof?
Now that warmer weather is here, the roof will be drying out and ready to be inspected for any winter damage that might have occurred.
Here is something that may never have occurred to you to check for… roof blisters.
They look like little bubbles or pimples in your roofing material and are often moisture related. If your roof is made of shingles, the blisters will be caused by moisture trapped inside or under the material.
As the temperature of the roof increases, so does the pressure inside the blister and the adhesion of the asphalt weakens. These blisters are more noticeable on warm sunny days, looking like small spongy spots to larger blistered areas. It is thought by some that blisters aren’t really a problem because they are totally sealed, but if they were totally sealed, they wouldn’t continue to grow as they do. If a blister stretches too much that it doesn’t shrink down to its original size when temperatures cool down, air and water will enter the blister and cause it to grow. This cycle can be repeated over and over until the shingle has lost it’s integrity.
Small blisters usually don’t need any attention unless they are allowing water in, but if they continue to grow, break or appear to be shedding the gravel from the asphalt. They should be looked at and repaired as soon as possible.
Are roof blisters something to be concerned about?
Many people will tell you they’re simply cosmetic…and that’s true, as long as the blisters remain in tact and don’t pop. Have you ever had a blister on your hand or foot and it didn’t pop? Probably not!
Sooner or later those blisters will pop, and when they do, they will leave empty pits in your shingles, leaving them exposed not only to the damaging UV rays of the sun, but also to wind and rain, causing roof leaks and other damage.
If you have noticed blisters on the shingles of your roof that are still in tact, it’s important that you keep a close eye on them. Once they begin popping, they will need to be repaired or replaced as soon as possible. In the meantime, there are some things you can do…
Tips to extend the life of a roof with blisters:
- Prevention is the best deterrent: When getting a new roof, try to make sure that it is installed according to manufacturer’s specifications as well as industry best practices. It’s difficult to have a roof installed perfectly, but by doing your homework and choosing a quality and qualified roofer your chances are much better.
- Limit Foot Traffic: If you know that you have blisters on your roof, it’s important to keep walking on your roof to a minimum, especially in warmer weather. Walking on blistered shingles can break the blisters open, allowing water and air to damage them even more.
- Keep your roof cleaned and maintained.: Allowing moss or algae to grow on your roof only adds to the problems of blisters.