What Salt Buildup Does to Concrete, Brick, and Stone Surfaces

By Coastal House Washing Team | July 3, 2026 |

Brick suburban house with a curved walkway to the front door, manicured lawn, and two yard signs in the front yard.

Salt buildup, commonly called efflorescence, forms when water carries dissolved mineral salts through concrete, brick, and stone. As it evaporates, the salts remain on the surface as a white, powdery deposit. The deposits themselves are cosmetic, but they indicate that water is moving through the material. Along the Mississippi Gulf Coast, humidity, rainfall, and salt…

Why Black Streaks on Your Roof Shouldn’t Be Ignored

By Coastal House Washing Team | June 15, 2026 |

Exterior view from a rooftop deck: a yellow hose draped along a metal roof and blue shutters on sidings of a house, with neighboring homes in the distance

Black streaks on a roof should not be ignored because they indicate active algae growth that can retain moisture, support additional organic buildup, and contribute to the deterioration of roofing materials. Along the Mississippi Gulf Coast, warm temperatures, humidity, and frequent rainfall create conditions that allow roof algae to thrive and spread. Black Streaks Are…

Posts Tagged: Algae Growth