There are two main reasons that asphalt shingles blister.
Extreme blistered roof shingles.
Owens corning oakridge 32 8 sq ft estate gray laminated architectural roof shingles.
Blisters are typically small steep sided craters measuring a quarter inch 6mm or less in diameter with no granules visible in the crater.
Blisters in shingles or rash blisters are a cosmetic defect in the opinion of some roofing manufacturers and an indicator of reduced shingle life in the opinion of some building professionals.
Shingles is caused by the varicella zoster virus the same virus that causes chickenpox.
Poor or inefficient ventilation causing the shingles to reach excessive temperatures over 60 c.
Although shingles can occur anywhere on your body it most often appears as a single stripe of blisters that wraps around either the left or the right side of your torso.
If the shingles on a roof have trapped moisture they are highly likely to start blistering.
The first thing to look for is any roof penetrations.
Our photo left shows blisters on an atlas brand asphalt shingle roof in georgia.
Shingles is a viral infection that causes a painful rash.
Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle.
Loss of gravel granules or another surfacing membrane deterioration blisters in seams which have reduced lap coverage blisters that have breaks that can.
Typically asphalt shingles only blister where the exposure conditions on the roof include one or more of the following.
Item 10076 model 671428.
As the air heats up the shingles the trapped moisture heats and can cause blisters to rise up on the shingle.
In at least some cases blistered asphalt shingles are more easily converted to pitted shingles by foot traffic hail and in some cases during the course of aging but before the end of the shingle warranty period.
Blistering only occurs in asphalt roof shinglesas it is a byproduct of manufacturing or installation.
While undergoing the lamination process moisture can be trapped between layers.
In fact it s rare for leaks to develop in open areas of uninterrupted shingles even on older roofs.
Items that penetrate the roof are by far the most common source of leaks.
The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it.
Penetrations can include plumbing and roof vents chimneys dormers or anything else that projects through the roof.
The shingles are composed of different layers of material.
