Roof Shingle Blisters

Photos of asphalt shingle blisters converting to pitting.

Roof shingle blisters.

This is caused by excessive heat from poorly ventilated and over heated roof systems. Blistering only occurs in asphalt roof shinglesas it is a byproduct of manufacturing or installation. Asphalt shingle blisters are raised bumps or protrusions in shingle surface either closed blisters or open ones showing a small black pit or crater when the protective mineral granules have been lost from the peak of the blister. Also if a roof does not have proper ventilation shingles can blister because of intense heat.

If the shingles on a roof have trapped moisture they are likely to start blistering when the sun heats the roof. Blisters are now usually formed when volatiles flash out of the asphalt in newly installed shingles. Blisters in asphalt shingles are caused when moisture is trapped within the shingle during or very soon after the manufacturing process. Asphalt shingles can blister as a result of trapped moisture in the shingles.

A roof that is experiencing many small bubbles is said to have shingle rash like skin blisters these are also filled with either water or gas that originates from one of two places. When the sun heats the shingle the trapped moisture will rise to the surface causing the tell tale blistering. Shingle blisters are small areas on the product that bubbles up like a blister someone might suffer in their skin. In the photo shown here some blister tops have lost granules and are beginning to expose the shingle interior substrate.

Roof blisters can be caused by any number of problems. The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it. Blisters typically appear within the first year after shingles are installed. As the shingle is heated up the blister expands within the shingle and eventually splits or pops.

Blistering normally happens on asphalt roofs. 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. Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle. 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.

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. Blistering can also happen as a result of poor ventilation. While undergoing the lamination process moisture can be trapped between layers. The shingles are composed of different layers of material.

During the manufacturing process moisture gets trapped within the shingle itself. What is left is a void in the granules that leaves the underlying asphalt exposed and possibly the fiberglass mat.