Roof Coating Blisters

Blisters may be filled with water or air.

Roof coating blisters.

Loss of gravel granules or another surfacing membrane deterioration blisters in seams which have reduced lap coverage blisters that have breaks that can. They are usually formed by the pressure of moisture beneath the surface of from lack of adhesion causing dry spots. This roof has way more blisters on it than normal. 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.

When you coat a roof you seal moisture inside the substrate. Most blisters are caused by the same thing moisture. All conventional low slope roof systems experience blisters in some form. It is important to recognize the difference before proceeding.

Bubbles across your foam roof will look like small or large rounded domes that stick up from the surface. Once broken water is more likely to get under the coating or leak into the roof. Blisters may occur below or between ply sheets in a built up roof system at the roof coating interface with the roof surface or between coating layers when multiple coats have been applied to the roof. Generally speaking unless its at a scupper or in a ponding area one broken blister is not an emergency.

Foam roofs are made from spray foam polyurethane by mixing two different materials together. It is now trapped underneath the coating with nowhere to go.