Water leaking behind stucco can potentially form blisters. If water enters the wall assembly behind the stucco, it can become trapped between the stucco and the underlying layer(s) of the wall. As the water accumulates, it can cause the stucco to bulge or blister outward. This can happen if there is a failure in the building's weather-resistive barrier, such as a hole or tear in the housewrap or flashing, or if the stucco was not installed correctly. Blistering can also be caused by leaks from plumbing or HVAC systems that are located within the wall assembly. In any case, it's important to address the source of the water infiltration and repair any damage to the building envelope to prevent further deterioration.

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