Flat Roof Felt Bubbling

Vapour from contact bonding adhesive.

Flat roof felt bubbling.

Access the roof using an extension ladder. 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. When the roof has warmed in the sun the felt swells in the heat causing blistering on the surface. 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. Whilst bubbles or blisters on a one piece epdm roof can be unsightly they will not cause the rubber membrane to fail. Moisture has already penetrated under the felt. A roof blister is a raised area where there is a loss of adhesion of the roof.

Walk the roof and locate any raised ridges or half bulges in the roofing. Cracks and signs of bubbling if the cracks are also showing signs of bubbling then water could possibly seep through the surface. The result is a series of pot marks which allow moisture to ingress and cause the covering to fail the following winter. This area can fill up with air or water to form a blister which looks like a bubble on your roof.

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. 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. Sweep away any loose gravel aggregate from the areas where repairs are needed. 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.

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.