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.

Roof coating blisters.

Once broken water is more likely to get under the coating or leak into the roof. This roof has way more blisters on it than normal. Foam roofs are made from spray foam polyurethane by mixing two different materials together. Generally speaking unless its at a scupper or in a ponding area one broken blister is not an emergency.

All conventional low slope roof systems experience blisters in some form. They are usually formed by the pressure of moisture beneath the surface of from lack of adhesion causing dry spots. Blisters may be filled with water or air. It is important to recognize the difference before proceeding.

Blisters are pockets in the roofing material with a spongy feel. Most blisters are caused by the same thing moisture. When the roof heats up due to the sun or internal building heat this moisture evaporates and becomes water vapor that expands by up to 1300x its volume. It is now trapped underneath the coating with nowhere to go.

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. Bubbles across your foam roof will look like small or large rounded domes that stick up from the surface.