Should I Waterproof My Stucco?

Should I Waterproof My Stucco?

March 14, 2019

Waterproofing is essential for almost every building project. If not properly sealed, structures will allow moisture to seep into materials, where it can become trapped. If this moisture does not drain properly, it can cause rotting, damage and mold. With this in mind, it’s important to properly waterproof stucco. Therefore, the answer to the question above is “yes.” However, your stucco company in Bluffton, SC offers a few cautions.

Waterproofing stucco is more complex than many homeowners or builders believe. It’s more than slapping a coat of waterproofing on the exterior. Proper waterproofing of stucco is a three-part process that requires in-depth construction knowledge. Following is an overview of these three components.

Multiple-Layer Approach

To create a waterproof stucco finish, builders should use a multi-layer approach to construction. A stucco wall should include a single layer of weather-resistant barrier, a 3D plastic drainage matrix, a metal or fiberglass mat and three layers of stucco. The weather resistant barrier is not enough on its own to waterproof the structure. It’s important to include a way for the moisture to drain, which is where the matrix comes in.

Drainage Matrix

The drainage matrix is also known as an air gap, drainage mat or rainscreen gap. This matrix allows trapped water to drain from the structure. It ensures that moisture does not get trapped in the wall by providing a pathway for draining and an air gap for evaporation. The gap also reduces the risk of moisture spreading between layers. Working in combination with the weather resistant barrier, the drainage matrix is an effective design to waterproof stucco.


Even with these structural components in place, moisture can gain access behind the stucco. How? Openings in the stucco wall offer points of entry. Any openings around windows are susceptible to moisture. This makes the use of metal flashing essential. This flashing must be properly installed around all doors and windows where they meet the stucco. This will form a watertight seal. Layers of water-resistant barrier should also be used beneath the bottom window flanges and on the sides.

For roof and stucco intersections, kick-out flashing must be used. This will prevent water intrusion at this opening. The use of a water-resistant barrier is also recommended at the top of the stucco walls. Rain gutters provide additional protection.

Professional Support

Due to the complexity of the structure and the importance of waterproofing stucco, it is highly recommended that this job be left to the professionals. Homeowners who attempt to complete this waterproofing as a DIY job run the risk of allowing moisture into their structure, which will have serious long-term consequences.

We Know Waterproofing

If you need to waterproof your stucco, contact your local stucco company in Bluffton, SC. The experts at Spring Construction are ready to assist you. We’ve been the area’s go-to source for stucco since 2005. With in-depth knowledge of waterproofing and extensive experience in the industry, our team will ensure your project gets done right the first time. Contact us today to get started!

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