Flat Roof Blisters

To repair a blister cut away the membrane until you reach an area where the membrane still adheres to the roof tightly.

Flat roof blisters.

Left alone it might take several yeas for the. They appear in all types of roofing systems residential and commercial. 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. The blister is near enough to the seam that it may cause the seam to open up.

A single blister on a seam. In bituminous systems voids can be created by improper adhesion during application. Blisters can develop from voids which are essentially bubbles caused by uneven bitumen application trapped debris or gases from trapped moisture. It expanded as vapor and made this blister.

While roof blisters may not need immediate attention if left unmonitored they could lead to saturated insulation and a damaged membrane. This flat roofing type is ideal for roofs with high amounts of foot traffic or if the roof is often hit by airborne debris. Shown below are a multiple photos of flat roof or cool coated roof blisters. The blister is in an area that receives foot traffic.

Water somehow got under the roof coating and couldn t get back out. With weather changes roof blisters may pop up on your commercial flat roof. Some are not so bad and others show a roof that needs quite a bit more work.