Q—The brick planter box on our house has a white, chalky stain on it. We have tried scrubbing it off, but it keeps coming back. What causes it, and what can be done about it?
Tuesday, June 21st, 2011 Posted in DIY Home Improvements, Exterior Remodeling, FAQ, Freezing Temp. Problems, Historic Homes, Landscaping, Materials- Construction, Spring, Waterproofing, Winter | 1 Comment »A—The white stain is called efflorescence, and is caused by salts that have been transported from within the brick and mortar by moisture in the brick, and deposited on the surface by evaporation. The stains are cosmetic, and not harmful. ...

