Why does a slab that looks solid still let water in? Concrete is strong, but it is not watertight. Every pour contains a network of tiny capillaries, and water moves through them by pressure and by wicking, carrying salts inward and slowly rusting the steel inside. Owners usually find out only after a stained ceiling, a damp garage wall, or a mold smell in the basement. Concrete waterproofing closes those pathways before the damage starts. The four myths below explain why so
