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Tips & Advice

Essential Crawlspace Moisture Control Tips

Posted February 11, 2016

Since your crawlspace is exposed to the elements and the soil surrounding your home’s foundation, it can become susceptible to moisture issues. An overly wet crawlspace, especially if it’s insulated, can allow mold to grow. It can also increase the likelihood of rotting wooden beams, as well as other structural problems. To protect your crawlspace, follow these tips on how to control moisture in it. For more help, contact one of your local insulation contractors in Seattle and Tacoma, WA, to set up a consultation, or to make a service appointment.

Have a Vapor Barrier Installed

To protect your crawlspace and home from moisture intrusion, hire a crawlspace professional to install a vapor barrier—this product is usually manufactured as polyethylene sheets. In areas of the country that receive a lot of seasonal rain, soils can absorb, and may become saturated with, significant amounts of water. Since crawlspaces can be exposed to this moist earth, they may become adversely affected. By covering the soil with a vapor barrier, you can decrease the amount of evaporating water from the ground and into your crawlspace. These barriers need to be properly installed—that is, seams have to overlap and vapor barriers need to cover the soil directly below the crawlspace completely.

Prevent Flooding in Your Crawlspace

Water can be very destructive when allowed to infiltrate your home or crawlspace. To prevent something disastrous, like flooding, have a sump pump or French drain installed. Both solutions can quickly and effectively divert water away from your crawlspace and your home’s foundation. Also, make sure exterior drains are unobstructed. Clogged drains or failing draining systems can create moisture issues in crawlspaces.

Control Airflow in Your Crawlspace

Control the airflow in your crawlspace to reduce moisture concentrations. In areas where humidity levels are low year-round, increased airflow can be a welcomed thing. However, in humid areas, increased airflow through a crawlspace might cause moisture problems. For example, when temperatures are high, moist summer air can maintain the high moisture level in crawlspaces. When temperatures drop in the winter, moist air can condense in crawlspaces.