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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.

The decision to repair or replace stucco depends on the extent of the damage. For minor issues like small cracks, holes, dirt, stains, or discoloration, a repair is typically sufficient and more cost-effective. These issues can often be resolved with a simple repair, a deep clean, and possibly a new coat of paint. However, for more significant problems such as large cracks, peeling, mold, algae, or structural water damage, a replacement might be necessary. In these cases, it is best to call a professional stucco contractor for an inspection. An expert can assess the severity of the damage, determine if there are deeper issues, and advise whether a repair is adequate or if replacing a section or an entire wall is the more cost-effective, long-term solution.

Solid, unpainted stucco shouldn’t suffer damage from dots of glue used for this task. If the stucco is dirty, you may notice slight marks when you heat and peel the glue away, but these aren’t permanent.

However, not all stucco walls are solid stucco. Some are “faux” stucco with a foam backing. This kind of stucco veneer is more susceptible to damage, including damage from hot glue. We don’t suggest attaching anything to these kinds of stucco walls, so make sure you check the stucco type before starting this project.

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.