What Is Non-Masonry Stucco?

Characteristics

• Non-masonry stucco is a type of exterior insulation and finish system, or EIFS. Installing this product involves attaching sheets of rigid foam insulation to the exterior walls, covering them with mesh wire fabric then applying numerous layers of polymer-based material. Texturing techniques on the final coat give the finish its stucco-like appearance. Builders in Europe began using this as a common finishing material during the 1950s although it didn’t begin gaining popularity in the United States until around 1969.

Identifying Stucco

• Although non-masonry stucco and traditional stucco look similar from a distance, close inspection can help differentiate between the two finishes. Tapping on a non-masonry wall will produce a hollow sound rather than a solid one. Look for chipped areas that reveal the underlying base coat and Styrofoam panel. Masonry stucco contains cement, making it feel and sound solid.

Benefits

• Non-masonry stucco provides an energy-efficient layer of insulation around the exterior of your house. It is a relatively inexpensive finish and allows for design flexibility. The pliable, moldable finish coat allows you to create a multitude of patterns to express your individual design preferences. Paint adheres well to this substance, making it easy to change the exterior color of your home whenever you like. One of the most important benefits of installing non-masonry stucco involves this substance’s resistance to water. Once the liquid finish dries, it creates a waterproof barrier.

Drawbacks

• The waterproof barrier that helps protect your home from water damage also prevents the passage of airflow through a non-masonry finish. While this won’t cause a problem in properly installed and maintained finishes, it can present a serious issue when cracks or chips occur. Non-masonry stucco with small fissures or cracks can allow water to enter the substrate and prevent it from evaporating. This trapped moisture can cause the wall structure to rot and deteriorate. Regular inspections by a qualified home inspector can help prevent this costly finish failure and protect your home from future water damage and mold growth.