A stucco exterior is a durable component of a house's structure. Its insulating qualities make it a favorite in warmer climates. While very little stucco maintenance is generally necessary, from time to time repairs may be in order. Some stucco repairs are within the experience range of most do-it-yourselfers, but trained professionals should handle more extensive repairs.
System Maintenance
The stucco exterior on a house is only part of the exterior system that protects the house's frame from the effects of weather. Windows, doors, roofs, flashings, sealants, eaves, troughs and down pipes all work together to direct water away from the house. They also serve to protect the stucco from unnecessary moisture. As part of routine house maintenance, the homeowner should inspect all of these systems to ensure they are functioning properly. Prompt repair of any area showing signs of leakage is a good way to help maintain the appearance of the stucco cladding on the house. Since stucco lasts longer in a drier environment, all spray heads from the lawn's irrigation system should spray away from the house's exterior.
Cleaning
Cleaning the stucco's surface with clear water from a garden hose usually is sufficient to remove most surface dirt. Start the cleaning process from the bottom of the wall, and work your way up. That way the stucco has sufficient time to absorb the excess moisture and to support its weight. Pressure washing is usually not necessary, but if the walls are excessively dirty, you should hire a professional to pressure wash them. If mold or mildew is growing on the stucco walls, use a cleaner appropriate for stucco to remove the growth.
Crack Repair
If the wall has cracks narrower than the width of a credit card, repair them by painting over them with an elastomeric sealant and paint. If the cracks are wider than a credit card but no larger than 1/8 inch, a premixed stucco patch with some Portland cement added often takes care of the problem. Cover the patch with plastic for 24 to 48 hours so the repaired area cures slowly. Cracks wider than 1/8 inch need the attention of a professional. He may need to remove stucco down to the lathe underlayment and replace it to properly repair the problem.
Painting
Just like paint protects wood siding, paint over stucco serves as a wear layer against the elements. For best results, choose an acrylic latex paint suitable for stucco. Another option is to repaint with an elastomeric paint, which is especially good in areas that have a lot of wind-driven rain. Elastomerics expand more and provide a thicker coating.
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