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Crawlspace Encapsulation 

Many building professionals now recognize that building an unventilated crawlspace (or closing vents after the crawlspace dries out following construction) is the best option in homes using proper moisture control and exterior drainage techniques.

If you have or will have an unventilated crawlspace, the best approach is to seal and insulate the foundation walls rather than the floor between the crawlspace and the house. This strategy has the advantage of keeping piping and ductwork within the conditioned volume of the house so these building components don't require insulation for energy efficiency or protection against freezing. It’s best to locate the access door to the crawlspace inside the home through the subfloor unless you build and maintain an airtight, insulated access door in the perimeter wall.


Sealed and insulated crawl spaces perform better in terms of safety and health (pest control), comfort (warm floors, uniform temperatures), durability (moisture) and energy consumption than passively vented crawl spaces. Crawl spaces should be dry so that they are less likely to have pests, termites and mold. A dry crawl space is therefore safer and healthier than a wet crawl space. Ground cover prevents evaporation of ground moisture into the crawl space.

However, vented crawl spaces experience serious moisture and mold problems that cost builders and the homeowner significant resources to repair. Also, wintertime ventilation makes crawl spaces colder and increases the heat loss from the home – venting crawl spaces wastes energy, and can lead to freezing pipes and uncomfortable floors.

In short, crawlspace vents should be sealed, crawlspace walls insulated, rim joists and spaces where air may leak should be sealed, and the ground should have a continuous sealed cover such as taped polyethylene.

This information is based on a report prepared for the US Department of Energy’s Building America

Program (see Building America cover page for more information). The report is freely available to the public at

At EcoMaster we...

Remove old insulation and any crawlspace debris
Inspect for mold and perform mold remediation where necessary
Seal rim joists and sources of air leakage
Install fiberglass rolls of insulation
Wrap piers
Insulate walls with termite resistant rigid insulation
Seal vents
Apply ground vapor barrier
Install dehumidifier, drainage, sump pump
And more…


Call 800-704-6156 !

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