How to Patch Exterior Stucco

What You'll Need
Portland cement
Damp rags
Cold chisel

Finishing your home with exterior stucco is a great way to add a creative design element to your home. At the same time you are providing your home with great protection and a durable, long lasting siding material.

Stucco is close to cement in that it is made with an aggregate, a binding agent, and water. When stucco is applied it is done in a wet condition, and when it dries it becomes very hard. Stucco is used around the world to finish homes and can look great. However, it will lose some of its appeal when there is an unsightly crack, chip, or large chunk of stucco missing.

Getting Started
Before repairing, or patching, your exterior stucco, take a general look at the condition of the crack. If it is a small crack in the middle of the wall, or near a corner, then you can patch that easily. However, if the crack runs upwards from the base of the home, or starting at the roof, there could be a more serious problem with the foundation. Consult with a foundation professional to find out what is really going on before you make any repairs. You might be just trying to cover up a larger problem.

Small Cracks Are Fixed Quickly
In the event of a small, thin crack in the exterior stucco, you can fix that with some paintable caulking. Just apply the caulking to the crack and push in with finger tips until the crack is full.

Larger Cracks Require Cleaning First
Use your wire brush and chisel to clean out larger cracks that have separated a little. Soak the area with a hose to remove any dirt and debris. This will also prevent the older stucco to suck out the water in the new stucco and cause it to crumble.

Mix Stucco

In a pail, mix your stucco with some builder's sand and water. Mix to a pliable consistency. Apply some polyvinyl acetate to the area to act as a binding agent before spreading in the mortar.


Once the binding agent becomes tacky to the touch then you can patch the crack with your stucco mixture. Work the mixture into the crack fully and make sure the entire crack is full or mortar. Follow the crack from top to bottom.

Bitumen Cloth
After the hole is patched then over the area with a bitumen fiberglass cloth. Press the cloth into place with a paint roller or brush. Let this dry and then add another coating in the same manner. Once it is dry, then you can work with it until it is the same texture as the rest of the area.


If your home is painted, then match the color and paint over the area. You may have to repaint the entire wall if the paint has been there for a long period of time and has faded a little.