Rubber Roof Blistering

Vapour from bonding adhesive.

Rubber roof blistering.

In severe cases the membrane will actually crack when the pressure becomes too great. Fixing bubbles and blisters in an epdm roof. To permanently repair blisters it s necessary to cut away the blistered area down to the insulation. A roof blister is a raised area where there is a loss of adhesion of the roof.

This can occur for two main reasons. Blistering blisters form when there are pockets of air or moisture trapped between layers of your roof s membrane or between the membrane and the roof deck. Bonding adhesives are used to attach epdm membranes to upstands and around the roof perimeter. As the sun heats the roof those pockets expand and stretch the membrane.

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. 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. This area can fill up with air or water to form a blister which looks like a bubble on your roof. All conventional low slope roof systems experience blisters in some form.

These can be caused by a variety of issues which are all avoidable if the roof design is correct and the membrane is correctly installed. Roof blisters can be caused by any number of problems. Thick white colored coating with an amazing ability to conform to and protect against all weather conditions. The bubbles are trapped air or moisture.

Blisters can trap moisture and draw in more even when it doesn t rain. Heng s fibered roof coating is not suitable for rubber roofs or homes with asphalt roofing. Stop the problem at the source. Items you will need putty knife rv sealant drill bit to match existing screws.

Workers should always inspect the surrounding areas for tears punctures or any other anomalies that could let in water.