Crawl Space Ventilation Ideas

Water Issues

• Water pooling in a crawl space is particularly problematic. Ensure the water is not coming from plumbing or sewage lines, then check the surrounding ground, pavement and the building or home roof to see if one or all are facilitating the bulk water problem. Establishing a barrier to prevent the excess water from entering the crawl space may be more cost effective than new ventilation. Likewise, adjusting drains and ground to reduce the potential for water to pour into the crawl space can also help.

Moisture from Soil

• Water in the soil beneath the home will evaporate and produce a moist environment in the crawl space. This is particularly bothersome during hot summers or in humid environments, but ventilation is not always necessary. Laying a vapor barrier down over the soil in the crawl space can reduce the evaporation and excess moisture in the crawl space environment. If the crawl space has walls, the vapor barrier may extend up the walls as well, but if termites are a potential problem leave some space to watch for termite mud tunnels.

Seal the Crawl Space

• Another alternative to venting a crawl space is to seal it up completely. In humid environments, such as the southeastern United States, humidity can complicate crawl space problems by adding excess moisture. As long as the building or home has air conditioning, the crawl space may be sealed completely without ventilation; often, this will fix the problems stemming from the humid environment.

Necessary Ventilation

• Ventilation for crawl spaces is still necessary at times. If the crawl space is producing warmth or moisture inside the home, it is not working effectively. Excessive energy costs may also be from poor crawl space functioning. Closing off the crawl space and installing a ventilation system with a fan can help with a poorly functioning crawl space and also improve energy efficiency for the home or building.