Roof Blistering Definition

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.

Roof blistering definition.

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. Poor attic ventilation is another reason blisters will appear. A roof blister is a raised area where there is a loss of adhesion of the roof. Asphalt shingles can blister as a result of trapped moisture in the shingles.

There are three primary issues associated with blistering. 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. The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it. The shingles are composed of different layers of material.

While undergoing the lamination process moisture can be trapped between layers. Built up roofs are particularly susceptible. Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle. Roof blisters can form if workers allow air or moisture to get trapped between layers during roof installation.

When you have no shade to block direct sunlight to a roof small blisters can form. Blistering only occurs in asphalt roof shinglesas it is a byproduct of manufacturing or installation. Typically asphalt shingles only blister where the exposure conditions on the roof include one or more of the following. All conventional low slope roof systems experience blisters in some form.

Shingle blistering as a roof defect. 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. This area can fill up with air or water to form a blister which looks like a bubble on your roof. Blisters are typically small steep sided craters measuring a quarter inch 6mm or less in diameter with no granules visible in the crater.

Workers or employees can break blisters by stepping on them which can expose the building to leaks. So at least on some roof shingles rash blisters may indeed be an indication of a reduced life expectancy. Roof blisters can be caused by any number of problems. Construction definition roof blister.

In some cases moisture can get trapped within the shingles during the manufacturing process.