Crawl Space Insulation
Sealing the outside air out and/or conditioning within the crawl space environment is the recommended solution. If insulating the crawl space is a concern, we recommend insulating the foundation walls with polystyrene insulation. You do not need to insulate the ceiling of the crawlspace but check with your local building codes (because although they may not be optimal, or even based on the correct science, they are still the governing say so).
Insulating an Unventilated Crawl Space
According to the U.S. Department of Energy, the best approach to insulating an unventilated crawl space is to seal and insulate the foundation walls rather than the subfloor. In their consumer's guide to energy efficiency and renewable energy, the advantages to insulating the crawl space are as follows:
• Less insulation required (about 400 sq. ft. for a 1,000-sq.-ft. crawl space with 3-foot high walls.).
The disadvantages of insulating a crawl space include the following:
• The insulation may become damaged by rodents, pests, or water (polystyrene insulation can be chewed through by rodents and possibly pests, but should be unaffected by water).
Of course we can't create a vacuum in, nor ever be able to seal out all of the outside air, but the CleanSpace® crawl space encapsulation system comes as close as possible.
Sealing your crawl space is the first step. If sealing isn't enough, then insulation can be installed in the crawl space.
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