Long known for its versatile appearance, ready availability, and durability, Portland cement plaster remains a popular finish for many buildings, from commercial to residential. However, damage can occur, whether on older installations or poorly installed newer ones.

Moisture management is a top priority in a stucco installation because water is one of the major culprits in plaster deterioration. It can lead to rust and rot. It enters the building through cracks, through the roof, around chimneys, or through window and door openings. It can get behind building paper that is torn or not properly lapped at seams. Portland cement plaster is a breathable material that does allow moisture vapor to pass through, so it is capable of drying out and does not trap moisture.

In any case, repair is a straightforward procedure that can bring the surface back to good condition.

Update Your Stucco

Older plaster surfaces can become worn or faded upon exposure to weather, such as rain, snow, and sunshine. Today’s pigments are compatible with cement-based materials and are durable over the long term. Pigments should meet the requirements of ASTM C 979, Standard Specification for Pigments for Integrally Colored Concrete.

A wall that was poorly cured following installation may exhibit minor cracks on the surface. Even minor cracking can detract from the look of an otherwise good quality wall. As long as cracks are not too wide so that water passes through them, a new finish treatment can be a quick fix. That could be a portland cement-based paint or a slurry of cement and pigments, sometimes call a fog coat. 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.

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