Blisters are bubbles or pockets of air that form on your shingle roof’s surface when volatiles (chemical compounds added to asphalt to waterproof them) flash out of the asphalt. Should you be worried about blisters on asphalt shingles? Since asphalt shingles are made of two layers, blisters won’t immediately cause leaks. However, they can drastically shorten your shingle roof’s lifespan.
Ken Morton & Sons, your local roofing company, elaborate further below:
How Blisters Can Shorten Your Shingle Roof’s Lifespan
When the blisters pop, some of the granules embedded in the shingle’s top layer are dislodged. These granules protect your shingle roof from ultraviolet rays and premature aging. Without them, it’s only a matter of time until cracks start to form on your roof. That’s why it’s best to have one of your local roofers remove shingles with blisters before they pop.
What Are the Usual Culprits Behind Shingle Blisters?
- Manufacturer defects – If moisture is trapped in the shingle substrate during manufacturing, it will eventually evaporate and form pockets of air. However, thanks to technological advancements in manufacturing, manufacturing defects are rarely an issue nowadays.
- Poor ventilation – Poor roof ventilation is the usual culprit behind roof blisters. Without adequate ventilation, warm, humid air is trapped in your roof. If enough heat accumulates in your attic, blisters may start to form on your roof. There’s also the issue of mold. Trapped humid air creates a damp environment that’s the perfect breeding ground for mold and mildew, which can easily affect other parts of your home.
How Much Ventilation Does Your Roof Need?
As a general rule, roofing systems with a vapor barrier should have a square foot of roof vent for every 300 square feet of ceiling space and a square foot of roof vent for every 150 square feet if your roof doesn’t have a vapor barrier.
Ken Morton & Sons offers a wide range of professional exterior services, including roof and siding replacement services. To get a free quote call us at (856) 582-8800 or fill out this form. We serve homeowners in Pitman as well as the surrounding NJ communities.
