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Stucco is considered a type of cladding because it includes a built-in ventilation layer, a weatherproof membrane beneath that, and, often, a layer of insulation to improve building efficiency. The multiple layers of stucco—the scratch coat, the brown coat, and the finish coat—also create a more complex building membrane, so it’s more accurate to call it cladding. However, homeowners and contractors alike refer to stucco as siding.

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.

Mortar, or masonry mortar, is mainly used in joints and as parging for stone, brick, or cement construction. Stucco is primarily a surface material used as wall coverings. For maintenance, masonry will need repointing or replacing as damage or land shifting occurs, whereas stucco will need patching or refinishing as it tends to crack over time along with other types of wear-and-tear.