A: Tom Silva replies: Cement block provides a good, solid base for stucco, but if you try to apply it directly to the walls, the paint will interfere with the bond. Stripping the paint would be a lot more work than it's worth, so you should first fasten galvanized metal lath (called diamond lath) to the walls with masonry fasteners.
If you're applying stucco to brick, cement block or existing stucco walls, you must keep the walls damp with a mister. If you're applying the stucco to a painted or wooden surface, you need to apply lath to the wall. Using paper-backed 17-gauge self-furred lath will save you the step of attaching roofing felt first. Measure carefully and then ...
The application methods will vary depending on whether the existing wall is wood, block, brick, concrete, or some other type of material. Stucco a Masonry or Concrete Wall. 1. To apply stucco to an existing brick, block, or concrete wall, first brush a concrete bonding agent onto the wall, then allow it to dry completely. 2.
Stucco offers an inexpensive and durable finish for interior and exterior walls. If you are unable to think of the right way of finishing a cinder block wall, stucco application, followed by textured effect is the best option to consider. So here's how to stucco a cinder block wall and give it an appealing yet low-maintenance finish.
Make Your Mix A Little Rich: 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. I wouldn’t go as far as a 2 to 1 ratio, just a little more to make it adhere better.
To stucco a cinder block wall, apply a concrete bonding agent, apply scratch layer of stucco and then add a finishing coat of stucco, allowing 36 to 48 hours for curing between each layer. While the stucco is drying, mist the surface periodically to keep it moist during the hardening period. To apply stucco to an existing cinder block wall:
Total Wall makes a product specifically for this application they say. I have not used it yet, so I can not vouch for it, but if so it would be a very good thing. ... Stucco Over Painted Block would try to powerwash it with a good system and see how it turned out to start and then would grind where nesassary..wet block...roll,brush weldbond ...
Allow the wall to dry overnight, then apply a coat of concrete bonding agent. Paint the bonding agent on using a long-bristled brush, making sure to cover all voids and cracks in the wall. Bonding agent is used to keep moisture from the new stucco from soaking into the existing wall, which minimizes cracks and damage over time.