Stucco is a porous material that is commonly used to finish the exterior of new homes. Minor cracking (also known as “hairline cracks”) may appear in the topcoat of the stucco overtime – this is normal and will be most noticeable on smooth finish coats.

Within the first year of owning your home, you may notice salt deposits on your stucco siding. These salt deposits (also known as “efflorescence”) with exposure to moisture (rain, snow or lawn watering) that brings out the natural salts contained in the stucco that have not had a chance to bond in the material. These salts can usually be scrubbed off with a brush.

Stucco is porous and water will eventually make its way behind the stucco wall where it can accumulate and leak into your walls. Avoid exposing your stucco walls to unnecessary moisture or extreme water pressure. Do not wash your stucco with a pressure washer and do not let lawn sprinklers saturate the walls.

For more information and a detailed explanation of “efflorescence” in stucco and natural stone materials, see Chapter 6 “Efflorescence on Masonry.”