This Green Building Advisor article confirms that sealed crawl spaces have less mold and stay dryer than vented crawl spaces — and they often save energy.
The most comprehensive and definitive report on closed crawl spaces, covering design and implementation recommendations for closed crawl spaces, recommendations for improving existing wall-vented crawl spaces, a summary of Advanced Energy's crawl space research results, and answers to frequently asked questions about mold in crawl spaces.
"Energy Savers: Crawl Space Moisture Control" - Department of Energy
To effectively insulate your crawl space for energy efficiency and to create a comfortable home, you need to properly control moisture in your crawl space.
"To Vent or Not to Vent?" - Professional Remodeler, September 2004
New research indicates that rather than removing crawl space moisture, venting makes the problem worse.
"Closed Crawl Spaces Do Double Duty" - Home Energy, January 2005
A field demonstration project of closed crawl spaces vs. vented crawl spaces in North Carolina shows that this robust moisture control method also offers significant energy savings.
"Closing the Crawl" - Builder Magazine, October 2005
Answers to a reader's question "When a home is built over a crawl space foundation, what are the advantages, if any, of sealing the vents versus leaving them open?"
"Case Closed" - Pest Control Technology Magazine, February 2007
A business growth opportunity overview for pest control companies interested in offering crawl space closing services.