Chesterfield Roofing: Article About Blisters On Asphalt Shingles
If you've never seen asphalt shingles blister, then the first time can be a dramatic experience, particularly when it's your home. There are a number of different reasons why shingle blisters occur. In many cases, the shingles will self-correct, but sometimes blistering is a symptom of a larger problem that will require the services of a Chesterfield roofing company.
In this context, self-correct means that the asphalt expansion stops and the asphalt shrinks back to its original shape with all shingle granules intact. If the blistering is particularly severe or was interfered with, the asphalt cannot regain its original shape and the shingle will be compromised due to loss of granules and potential exposure of the middle layers. People can interfere by touching the blisters, but interference can also be caused by rain and wind.
The most common reason that shingles blister is that there's moisture trapped in the asphalt. As the asphalt heats, the moisture is able to release, which causes the blister. This is the least worrisome type of blister and is actually rather common. Some trapped moisture is to be expected when shingles are made, and some blistering during the first year while a new roof sets up is not unusual.
A more troubling reason why blistering occurs is that the shingles simply get too hot. Asphalt shingles can withstand intense heat, so when they overheat, it usually means that there's a problem with the attic ventilation.
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The heated shingles cause the attic to get hotter, and then the attic air balances with the outside air by exhausting through the ridge vents and bringing in new air through the soffit vents. If that process is obstructed, the hot air has nowhere to go and the shingles continue to heat up.
Blistering can also be a result of a manufacturing defect. Shingles can have an abundance of moisture, or the asphalt itself could've been compromised in some way during manufacturing. Blistering during its initial stages is generally light, and a heavy or widespread issue even early on is usually an indication of a defect. Some defects will not manifest until a particular temperature, so it's possible for an unusually high temperature to reveal an issue that never manifested before.
An important point to keep in mind is that the aftermath of blistering can look a lot like hail damage. If you're living in a home when the damage occurs, the cause will likely be obvious. If you're not living there or you're away on vacation, it may not be immediately clear. Repairing hail damage is simpler since you don't have to be concerned with the underlying cause.