Can you tell what is going on in this crawl space? Notice the dark spots on the foundation wall and the white wave-like deposits directly under the dark spots? Those white deposits are salt/mineral stains and are a phenomenon called “efflorescence”. Efflorescence is found when conditions inside the foundation are repeatedly wet and dry from water infiltration. Water is the number one enemy of your home and you definitely do not want any inside your crawl space. Direct water penetration into the crawl space (from cracks in the foundation, leaks from plumbing pipes, missing/inadequate vapor barriers, etc.) can damage the foundation and wood structure, and create an undesirable environment in the living areas that encourages insect and fungal growth such as mold/mildew. It’s a good idea to have annual inspections of your crawl space performed – especially after the kind of rain we have received lately. This kind of home maintenance can save you thousands of dollars down the road and help keep your home (and the air in it) safe.