What causes a blistering roof blisters often occur when excessive heat damages the roofing materials.
Roof blistering definition.
Poor attic ventilation is another reason blisters will appear.
This area can fill up with air or water to form a blister which looks like a bubble on your roof.
Asphalt shingles can blister as a result of trapped moisture in the shingles.
Blisters are typically small steep sided craters measuring a quarter inch 6mm or less in diameter with no granules visible in the crater.
The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it.
When you have no shade to block direct sunlight to a roof small blisters can form.
There are three primary issues associated with blistering.
Roof blisters can form if workers allow air or moisture to get trapped between layers during roof installation.
The shingles are composed of different layers of material.
All conventional low slope roof systems experience blisters in some form.
Built up roofs are particularly susceptible.
Roof blisters can be caused by any number of problems.
If left untreated a blister can grow larger and allow more moisture to get in so that the problem gets worse until more extensive repairs and possible replacement is necessary unless it pops.
Although the atlas view is reassuring based on field observation and experience and visible in beginning stages in the photo of an atlas roof shingle above we ve seen early granule loss at the blister site.
Blistering only occurs in asphalt roof shinglesas it is a byproduct of manufacturing or installation.
Membrane systems are most susceptible to blistering because blisters are formed by voids between the plies or at the point between the substrate and the membrane.
In some cases moisture can get trapped within the shingles during the manufacturing process.
While undergoing the lamination process moisture can be trapped between layers.
Shingle blistering as a roof defect.
Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle.
A pocket of air trapped between the layers of a roof membrane between the components of a roof assembly or within a layered roofing product such as an asphalt shingle.
So at least on some roof shingles rash blisters may indeed be an indication of a reduced life expectancy.
Blistering is an asphalt shingle roofing problem that is often mistaken for hail damage and is one of the most common issues residential roofing contractors are called to fix especially during the summer.
Construction definition roof blister.
Typically asphalt shingles only blister where the exposure conditions on the roof include one or more of the following.
