How To Stucco Concrete Block Walls

Allow the scratch coat to harden slightly.

How to stucco concrete block walls.

The basic stucco recipe is 3 parts sand to 1 part portland cement but for block walls a little bit richer mix will help the mud to stick better. A rich mix is simply adding a little more portland cement in the recipe. Apply the first coat of stucco to the concrete surface. Mix it to the consistency of regular paint.

While the stucco is drying mist the surface periodically to keep it moist during the hardening period. The first coat application is important to be done carefully as it forms the base of this finish. Stucco a masonry or concrete wall. To apply stucco to your existing brick block or concrete wall first brush a concrete bonding agent onto the wall then allow it to dry completely.

Add the stucco to the top of the wall then spread it from left to right repeating this as needed to finish the layer. First coat is my filler or skim coat and the second coat is my finished coat. Stucco is basically a custom mixed or a factory prepared cement plaster. Work your stucco over the big cracks and gaps first filling them in before you start applying the stucco to the whole wall.

After the bonding agent has been allowed to dry the stucco can be applied directly to the wall. Make your mix a little rich. The scratch coat should be between 1 4 and 1 2 inch thick. The magic trick most don t know about is a bonding layer of cement paint.

Use the flat finishing trowel to spread the stucco evenly across the surface. This first coat is known as the scratch coat this coat helps the final coat bond properly to the wall. Cement paint was used by masons of old to help new stucco material bond to old stucco concrete or concrete block. If you have a concrete sprayer use it to cover large areas quickly.

I wouldn t go as far as a 2 to 1 ratio just a little more to make it adhere better. Otherwise try picking up the stucco mix with a flat tool like a hawk and then transferring it to the wall with a trowel. With the coats you get a durable and lasting finish which is also an attractive and cost effective solution.