Home Renovation How To Apply Stucco Siding

Applying stucco can be done by the do-it-yourselfer following these simple steps.

Before applying stucco, the type of building has to be determined. Is it concrete, brick or block? Or is it a wood wall? The application used depends on which type of building the stucco goes on. Applying stucco can be done by the do-it-yourselfer following these simple steps.

Concrete, brick or block buildings are all treated the same. Brush the concrete bonding agent on the wall and then allow it to dry. After the bonding agent is dry, apply the stucco directly to the wall. This application begins with applying a scratch coat, which is a ¼ to ½ inch layer of mortar applied to the structure and allowed to harden slightly. After slightly hardening, scratch the mortar 1/8 inch deep in long lines and allow the scratch coat to cure for 36 to 48 hours with periodic misting to keep it damp. The finish coat will be applied after the curing of the scratch coat. The finish coat is applied 1/8 to ¼ inch thick. The stucco is now finished to the desired texture and allowed to cure another 36 to 48 hours, with misting periodically to keep it damp.

When applying stucco to a wooden structure, 15-pound roofing felt should be nailed to the structure. After installing the roofing felt, cover the felt with 17-gauge metal netting, bought in 150-foot rolls. Install the metal netting by attaching the netting to the structure with galvanized roofing nails, and then trim the netting with tin snips.



After attaching the net, the next step is to apply a scratch coat. This step is accomplished by troweling on a ¼ to ½ inch layer of mortar. Carefully force this mortar into the netting, causing the mortar to exude through the netting and will "key" the coating in place. Always complete a wall before starting another one and allow the scratch coat to slightly harden, and then take a plasterer's rake or a homemade tool to scratch the entire coat of mortar at least 1/8 inch deep and in long lines. Slow, damp curing is best when working with mortar and while providing the most strength. The scratch coat should be allowed to cure for 36 to 48 hours with periodic misting to keep it damp. Hot, dry days will require more misting than cool, damp days.

When the scratch coat has been allowed to cure, it is time to apply the finish coat. Use a flat finishing trowel to apply a 1/8 to ¼ inch finish coat to the scratch coat on the structure. If a powdered pigment is to be added, it should have water added to it and mixed completely before it is added to the stucco. Finish the stucco to the desired texture and allow it to cure for several days. While the stucco is curing, it is important to mist it occasionally to slow down the curing process. To finish this project, caulk around the doors and windows. If the stucco is to be painted, wait at least six weeks and be sure to use paint formulated to cover concrete.

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