Efflorescence on Foundation Walls

Along the bottom of the foundation walls, you can see water stains and a white powdery substance called efflorescence. Efflorescence is the result of moisture moving through the walls and pulling minerals to its surface, as the moisture evaporates, we are left with the crystalized minerals on the blocks. This is an indicator that moisture is a concern in the crawl space. This moisture contributes to the overall relative humidity in the crawl space. High relative humidity in the crawl space, often leads to homeowners noticing high humidity in their living space.