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. Small bubbles blisters and cracks are a common problems with felted flat roofs. When the roof has warmed in the sun the felt swells in the heat causing blistering on the surface. 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. Sweep away any loose gravel aggregate from the areas where repairs are needed.

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. Moisture has already penetrated under the felt. A roof blister is a raised area where there is a loss of adhesion of the roof. The result is a series of pot marks which allow moisture to ingress and cause the covering to fail the following winter.

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. Water buildup combined with heat from the sun can cause shingles to. Whilst bubbles or blisters on a one piece epdm roof can be unsightly they will not cause the rubber membrane to fail.

Vapour from contact bonding adhesive. 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. 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.

Access the roof using an extension ladder.