White Powder on Basement Walls? A Practical Guide to Efflorescence and Moisture Control
If a stubborn white, chalky residue keeps appearing on your basement walls, you’re likely seeing efflorescence—a mineral deposit left behind when water moves through masonry and evaporates. As moisture travels through concrete or brick, it dissolves naturally occurring salts. When that moisture reaches the surface and dries, the salts crystallize into a powdery film. While…