Crawl Space Vents: The Truth

Many homes with crawl spaces were designed to have open vents. The truth is these vents are harmful to your crawl space and your home. Learn why and how JES can help you address these issues.

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open vent in crawl space

Crawl space vents present a multitude of problems for homeowners. Open crawl space vents prevent controlling moisture under your crawl space due to the constant push/pull of the air throughout your home, also known as the stack effect.

The soil in your crawl space, regardless of whether the area appears dry, is constantly releasing moisture into the crawl space. Bacteria thrives in moist environments due to poor moisture management. According to the EPA, the key to mold control is moisture control. Because wet surfaces promote mold growth, fixing the water problem can improve your health and prevent additional damage.

Crawl Space Vents – The Studies:

Dominion Virginia Power recommends crawl space encapsulation with a polyethylene vapor barrier to combat crawl space moisture. A study by Advanced Energy shows that crawl space encapsulation is an energy-saving solution that reduces heating and cooling costs by 15 -18 percent annually.

A study by Advanced Energy shows that crawl space encapsulation is an energy-saving solution that reduces heating and cooling costs by 15 -18 percent annually.

This research has also been cited by the US Department of Energy, and the results have impacted changes in the 2009 and 2012 International Residential Code (R408.3). A fully encapsulated crawl space (also known as a conditioned crawl space, sealed crawl space, closed crawl space, and unvented crawl space) involves completely sealing the area underneath your home from moisture and water damage. The process also helps homeowners avoid the growth of wood-rotting fungi and mold which can contribute to structural failure and poor indoor air quality.

Crawl Space Vents and Crawl Space Encapsulation

To maintain a crawl space that is free of pests, insects, and bacteria, you have to keep the moisture out. The crawl space must be properly isolated from the ground and humid air. We use CrawlSeal™, a 20-mil vapor barrier, throughout the full length of the crawl space. It is placed over the dirt floor and concrete walls to keep moisture from entering the crawl space. The ends are secured to each wall for added durability. The heavy-duty reinforced lining has an antimicrobial finish to block mold and mildew growth beneath the liner. To help drain water that may seep up from the ground, a drain mat can be installed under the vapor barrier. Some houses also require a sump pump to purge standing water from the crawl space.

Crawl Space Encapsulation – Before & After

crawl space beforecrawl space after encapsulation

It is important to note that simply laying a plastic liner will not resolve the root issue. However, installing a vapor barrier is one of the best ways to stop moisture and humidity from passing through to your home. The benefits of a conditioned crawl space outnumber the disadvantages of a dirt, vented one. The finished space also makes for a great storage area. If you want a healthier and more energy-efficient home, crawl space encapsulation is a worthy investment that over time will pay for itself. So remember – close your crawl space vents and seal your crawl space!

JES Can Help With Your Crawl Space Repairs!

If you have a nasty crawl space and aren’t sure where to start with repairs, contact the expert team at JES for a free inspection and repair estimate! You also can check out our Free Homeowner’s Guide to Crawl Space Repair below for more information!

JES Service Area Map

Service Areas

HAMPTON ROADS & NE NC

1741 Corporate Landing Pkwy
Virginia Beach, VA 23454

NORTHERN VA & DC

8122 Bethlehem Rd
Manassas, VA 20109

MARYLAND

1250 Reames Rd
Middle River, MD 21220

CENTRAL VIRGINIA

2410 Southland Dr
Chester, VA 23831

WESTERN VIRGINIA

456 Old Courthouse Rd
Appomattox, VA 24522

SOUTHWEST VIRGINIA

1401 Southside Dr
Salem, VA 24153

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