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Yes, stucco can be installed over existing siding, but some contractors wouldn’t recommend it. Putting stucco over other types of siding requires careful consideration and proper preparation. Stucco is regularly added over brick and wood siding; however, some of the biggest factors affecting stucco installation include the condition of the existing siding and whether it’s strong enough to hold the weight of the stucco. If stucco is added to another type of siding, the weight can cause it to crack, making it susceptible to moisture, water damage, and mold.

When cleaning stucco siding, it is recommended to use a pressure washer with a psi (pounds per square inch) between 1,500 and 2,000. This range provides sufficient power to remove dirt and grime without causing damage to the stucco surface. It's important to avoid using excessive psi as it can chip or crack the stucco. 

Using a wider spray nozzle and keeping a safe distance of about seven to 10 feet from the siding helps ensure a gentle and effective cleaning process. Always follow the manufacturer's guidelines and adjust the psi accordingly based on the condition of your stucco and the specific requirements of your pressure washer.

Due to application and cure times between coats, stuccoing a house takes between 10 and 14 days. Professionals may be able to wrap up projects on smaller homes in 7 to 10 days, while stuccoing large, multi-level homes can take more than two weeks. For the standard three-coat stucco system, six days are dedicated solely to stucco drying timelines, which are necessary after each coat.

Masonry screws are the best option to be used on stucco. They’re thicker and made to penetrate harder surfaces like concrete and cinder blocks. Fluted masonry screws work the best because they create a stronger grasp thanks to the lines on their shafts. If you’re working on exterior stucco, use galvanized screws to prevent corrosion.