What Causes Black Spots on Concrete? Identify and Fix Them
Black spots on concrete usually come from biological growth, oil or rubber contamination, plant tannins, mineral staining, or a concrete-finishing defect. Moisture and concrete porosity allow stains to spread below the surface, but the spot’s texture, location, response to water, and pattern usually identify the cause. Key Facts at a Glance What Causes Black Spots […]