crawl space of a house

Crawl Space Encapsulation
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Encapsulating Your
Crawl Space

Most people dont like visiting their "cave like" crawl space. Ignoring the conditions in the crawl space are a thing of the past. Unhealthy air, damaging conditions, and a perfect environment for creepy crawlies are all reasons to look at repairs and improve the indoor air quality of your home. The list of benefits, however, go far beyond just saving on the energy bills and cleaner air.

Crawl spaces are typically vented to remove moisture through evaporation-groundwater, rainwater, and air humidity enter the crawl space and, under the right conditions, condense on duct work and crawlspace framing. It's a fairly ineffective way to deal with a part of the house that is prone to dampness.

Vented crawl spaces are a liability, as they allow access to pests, encourage mold growth, and diminish a home's energy efficiency. That's why sealed, continuously dry crawl spaces are now considered more effective and are healthier for the home.

crawl space of a house

Benefits of

Crawlspace encapsulation is one of the best things you can do to improve the air quality of your home.

One method of sealing a crawl space is by encapsulation-lining the floor as well as the foundation walls with overlapping sheets of heavy polyethylene plastic. Additional strategies-including insulating the foundation walls and using the existing HVAC system to heat and cool the crawl space to the same temperature as the rest of the house-will further increase the effectiveness of crawl space encapsulation. Ultimately, the result will be a dry crawl space, along with the following benefits.


  • Improved Structural Integrity: Of course, wet soil can undermine your foundation, which is why gutter systems are designed to channel water as far away from the home as possible. However, gutter systems are pointless if the crawl space is perpetually wet. By keeping the soil supporting your foundation dry, crawl space encapsulation can prevent extensive and expensive structural problems further down the road.
  • Increased Comfort Levels and Energy Savings: Encapsulating along with insulating and air conditioning your crawl space may produce dramatic energy savings. Even crawl space encapsulation alone should create a noticeable difference. It's harder to cool your home in the summer, for example, if the space beneath your floor is full of hot, humid air; after outside air is banished from the crawl space, your HVAC system should be able to work more efficiently and provide more uniform temperatures throughout the house in any season.
  • Fewer Incursions by Mold and Pests: When it comes to organisms colonizing and thriving in a wet crawl space, mold and mildew are two of the chief concerns; once established in the crawl space, they can spread throughout the house, encourage wood rot, and be difficult to eradicate. Termites, which love damp wood, aren't far behind in terms of the whole-house damage they can wreak. Plenty of other insects and rodents are attracted to dark, moist places that are free of predators-a typical wet crawl space. A polyethylene barrier will keep out not only moisture but also the mold and pests that tend to accompany it.

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