Roll Roofing Cracked And Blisters

Blistering and alligatoring are two problems that are common among membrane roofing systems.

Roll roofing cracked and blisters.

It looks a lot like alligator skin which is where the name comes from. Roll roofing also known as composition asphalt roofing is designed for cold installation on roof sheathing. As this happens the different layers become wavy or blisters can develop and crack open. Alligatoring is a crazed cracking pattern in the roof s surfacing.

How to tell the difference. Blistering is a different phenomenon in which bubbles form underneath the roof s membrane. When wavy spots happen along the lower edge of a layer the layer can pull up and away from the layer underneath. Typical signs that a flat roof has cracks are water spots or.

Over time the combined effects of weather and water can cause raised ridges or blisters in the roofing that are prone to cracks. 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. This means the roofing can be installed without a coating of hot tar applied first. Hail damage compared with blister rash damage on asphalt roofing shingles.

A roof blister is a raised area where there is a loss of adhesion of the roof.