Flat Roof Felt Bubbling

These bubbles of trapped air moisture can be caused by a variety of issues which are all avoidable if the roof design is correct and the membrane is correctly installed.

Flat roof felt bubbling.

Flat roofs often require more maintenance than pitched roofs because the water and debris don t roll off the roof as easily. Small bubbles blisters and cracks are a common problems with felted flat roofs. This area can fill up with air or water to form a blister which looks like a bubble on your roof. Walk the roof and locate any raised ridges or half bulges in the roofing.

Moisture has already penetrated under the felt. A roof blister is a raised area where there is a loss of adhesion of the roof. If they are spotted early there is no reason why they need cause serious damage and no reason for you to replace all of the felting. Diy temporary flat roof repair for felt roofs this is often a paint on fix from a tin like the repair videos at the top of the page.

Permanent flat roof repair this can either be a patch of torched on roofing felt or a layer on top of your existing felt if it will take it. When the roof has warmed in the sun the felt swells in the heat causing blistering on the surface. There are also liquid systems for felt roofs. During a warm summer flat roofs become illegal terraces and their asphalt or felt coverings are subjected to point loads just when they are most vulnerable.

Sweep away any loose gravel aggregate from the areas where repairs are needed. Whilst bubbles or blisters on a one piece epdm roof can be unsightly they will not cause the rubber membrane to fail. Access the roof using an extension ladder. 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 because of water vapour getting trapped under.

The result is a series of pot marks which allow moisture to ingress and cause the covering to fail the following winter.