![]() This is often caused by improper curing.Īt worst, the walls may be damaged due to moisture infiltration, building settlement, or other environmental factors. Map cracking on a portland cement plaster (stucco) wall. Another reason to recoat a plaster wall is that your building may need a new look, which can be accomplished simply by updating the color. That could be a portland cement-based paint or a slurry of cement and pigments, sometimes call a fog coat. As long as cracks are not too wide so that water passes through them, a new finish treatment can be a quick fix. Even minor cracking can detract from the look of an otherwise good quality wall. Pigments should meet the requirements of ASTM C 979, Standard Specification for Pigments for Integrally Colored Concrete.Ī wall that was poorly cured following installation may exhibit minor cracks on the surface. Today’s pigments are compatible with cement-based materials and are durable over the long term. Older plaster surfaces can become worn or faded upon exposure to weather, such as rain, snow, and sunshine. Repairing portland cement plaster (stucco) around a window Plaster repair is a straightforward procedure that is capable of bringing many stucco surfaces back to good condition. You don’t want to mask something major by addressing the cosmetics. Before beginning any repair, you should make sure that the walls are structurally sound and that there are no hidden problems.
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