Asphalt Roof Blistering

As the sun heats the roof the shingles with the trapped moisture become heated as well causing the surface to rise and develop blisters.

Asphalt roof blistering.

What are blistering roof shingles. 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. Blistering is a common problem with field applied exterior coatings such as paints and built up roofing systems. There is no fool proof way to prevent blistering.

Also if a roof does not have proper ventilation shingles can blister because of intense heat. The shingle manufacturer s local representative opined that the blisters were due to tree overhang debris or bird droppings. The roofing company co takes a look at what causes asphalt shingles to blister and what can be done to prevent it. There are two main reasons why blisters occur on asphalt shingles.

Blisters or blister rash can be identified by inconsistent bubbles rising up from inside the shingle. Whilst an asphalt roof can withstand water sitting upon it probably longer than most types of flat roofs it does ultimately start to. Causes of asphalt shingle blisters. Blistering normally happens on asphalt roofs.

In built up roofs blisters are raised surface areas over voids in a roof system which contain entrapped air and or moisture. I show you some of the problems with asphalt flat roofs and felt flat roofs these old roofs have blisters forming in them sometimes called bubbles becaus. Reader marcia reid provided these photographs of blisters on an 8 1 2 year old iko asphalt shingle roof in saskatoon saskatchewan canada. Alligatoring is a crazed cracking pattern in the roof s surfacing.

This asphalt roof shingle blister pattern is classic cosmetic shingle blistering by usual manufacturer description. It looks a lot like alligator skin which is where the name comes from. The roof overheated melted the asphalt and caused granule loss. You need to make sure that the crocodiling is in the asphalt rather than in the paintwork.

This occurs where the asphalt literally goes like a crocodile s skin. Blistering and alligatoring are two problems that are common among membrane roofing systems. During the manufacturing process moisture gets trapped within the shingle itself. Blistering exposes your roof decking and property to the elements which can ultimately lead to leaking and premature failure of the roof system.

The shingles are composed of different layers of material. The roof is not properly ventilated so there s a problem in the property itself the attic space the insulation or beyond. Blistering only occurs in asphalt roof shingles as it is a byproduct of manufacturing or installation. As the roof surface temperature rises the pressure inside the blisters rises and the adhesion of asphalt.

If the shingles on a roof have trapped moisture they are likely to start blistering when the sun heats the roof.