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8 Common Stucco Over Foam Problems and How to Fix Them

Stuccoing over foam board may appeal to you for two reasons. First and foremost, you enjoy stucco's low-maintenance and long-lasting finish. Second, use foam to increase your home's R-value, or insulation.

 

 

In the industry, stucco over foam is known as the exterior insulated finish system (EIFS). In some parts of Nevada and California, it is known as the one-coat system.

 

 

This system is typically found in older homes. Nonetheless, it has been deemed contentious due to the numerous associated issues.

 

 

It is unusual to see stucco applied over foam to insulate or finish the exterior of a house. Nonetheless, such a setup is likely to cause significant problems.

 

 

Several common issues with stucco over foam will be addressed in the following post.

1. The foam board is supported by the weight of the stool against the walls.

Stucco weighs approximately ten pounds per square foot. Can you imagine the weight it will carry when attached to a foam board?

 

 

No amount of nailing or adhesives will keep either material from coming away from the wall. The reason for this is that the foam board will most likely be unable to support the weight of the stucco. The application of stucco on top of foam guarantees failure.

2. Adhesion Problems are certain.

If you thought your weight was the issue, you should wait to learn about adhesion. I don't understand how you plan to attach stucco to foam. Will you use mortar? Probably not.

structotech.com/stucco-over-foam-problems/

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Uploaded on May 6, 2025