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You should aim to let stucco dry for at least 48 hours before it rains. While misting new stucco and keeping it moderately moist is important for strength and longevity, uncontrolled exposure to rain can lead to weak stucco that doesn’t bond properly. Rain can also affect the stucco finish and the color unevenly, leaving you with less appealing siding.

Stucco is very challenging to DIY, so it’s always best to leave the work to professional stucco contractors. The same recommendation applies to painting a stucco house, which should be left in the reliable hands of a professional exterior painter. Inexperienced DIYers can make several critical mistakes during stucco application, such as:

• Failing to apply sufficiently thick layers for longevity and water resistance

• Uneven application

• Uneven texture across the exterior

• Mixing the stucco improperly, leaving a weak structure

• Failing to texture properly in between coats, leading to cracking and chipping

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 average cost to repair stucco is about $1,600, with projects ranging from $250 for minor fixes to $6,700 for extensive work. The price is often calculated per square foot, typically costing between $60 and $120. Some professionals may charge an hourly rate of $40 to $50. The final cost depends on the extent of the damage, the type of stucco, your home's location, and whether there is underlying damage that also needs to be addressed.

Costs for specific repairs vary:

• Cracks: $8–$20 per square foot

• Holes: $250–$450 per hole

• Water damage: $30–$50 per square foot

• Chimney repair: $60–$120 per square foot

• Recoating: $4–$5 per square foot

While you may be able to patch small cracks yourself, it is recommended to call a professional for major repairs to ensure the job is done correctly.