Does this look familiar? It's mold and mildew growth in the concrete block wall of a crawlspace. Why does this happen? Well, concrete is actually very porous and wicks moisture from the surrounding soil into the air in a phenomenon called "capillary action". Much like the capillaries in your body that draw blood up to the surface of your skin, there are tiny tube-shaped holes in concrete do the same thing with water! These capillaries are formed during the concrete curing process when these blocks are being manufactured. The capillaries will allow moisture, mold spores, and other mildew and bacteria to permeate into your crawlspace. After time, you can start seeing growth like this picture has. Before that happens, it is best to have the experts at Healthy Spaces out to help you create a plan to dehumidify and encapsulate your crawlspace.