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Advanced Energy: Resources On Closed Crawl Spaces
Advanced Energy offers materials and information on improving an existing crawl space or designing and installing a properly-closed new crawl space.

NAHB: Video Series On Building A Closed Crawlspace
US NAHB online video series describe various steps and considerations for building a closed crawlspace.
Procedures

Advanced Energy: Closed Crawlspaces Perform Well
Advanced Energy provides a summary of their research that shows closed crawlspaces are a great moisture control strategy and also save energy if the installer follows climate-appropriate insulation strategies. (PDF)

Advanced Energy: Taking Vents Out of Vented Crawl Spaces
Advanced Energy found that closed crawl spaces, insulated spaces without vents to the outside, can significantly improve moisture control and have major energy savings with proper installation.

BSC: Design & Construction Of Conditioned Crawlspace
Building Science Corporation report details the design and construction of a conditioned crawlspace including background, design options, performance, and US code requirements. (PDF)

Building America: Unvented Crawlspaces & Conditioned Basements
Building America Solution Center describes issues and considerations for unvented crawlspaces and conditioned basements.

Construction Instruction: Crawlspace Best Practices
Construction Instruction describes best practices for building crawl spaces.

Energy Vanguard: Caution On Vented Crawl Spaces In Humid Climates
Energy Vanguard says the argument about whether you should vent a crawl space in a humid climate is over. Advanced Energy's research project from 2002 proved that closed crawl spaces outperform vented crawl spaces. A quick look at the psychrometric chart shows that the argument should never have existed in the first place.

Energy Vanguard: What Is The Best Way To Deal With Crawl Space Air?
Energy Vanguard says the best way to deal with the air in a crawl space is to encapsulate it and install a dehumidifier. Adding supply air from the HVAC system is tricky and may let the crawl space humidity go too high in spring and fall.

GBA: Building An Unvented Crawl Space
Green Building Advisor describes how to build sealed crawl spaces that have less mold and stay dryer than vented crawl spaces, and often save energy.

GBA: Construction Details For Sealed Crawl Space
Green Building Advisor construction details describe how to seal air and water leaks for a mold-free, energy-efficient sealed crawl space.

GBA: Does A Crawl Space Make Sense?
Green Building Advisor says achieving a safe, dry, unvented crawl space is just as logical and attainable as a safe, dry, full basement.

GBA: Vented Crawl Spaces & Psychrometric Chart Are Not Friends
Green Building Advisor says the argument about whether you should vent a crawl space in a humid climate is over. Advanced Energy's research project from 2002 proved that closed crawl spaces outperform vented crawl spaces. A quick look at the psychrometric chart shows that the argument should never have existed in the first place.

JLC: Builder Uses Sealed Crawlspaces
Journal of Light Construction describes how one production builder in an area prone to damp crawlspace problems has decided to began installing sealed and conditioned crawlspaces for its homes.

NAHB: Tech Spec On Closed Crawlspaces
US National Association of Home Builders online TechSpec presents an overview of benefits, US code considerations, best practices, and solutions for closed crawlspaces. (PDF)

ORNL: Vented vs. Unvented Crawlspaces In Homes In Mixed Humid Climate
Oak Ridge National Laboratory study Vented vs. Unvented Crawlspaces in Identical Side-by-Side Homes in the Mixed Humid Climate indicated that the sealed and insulated crawlspace design is better than the traditional vented crawlspace in the mixed humid climate. (PDF)

US DOE: Guide To Closing & Conditioning Ventilated Crawlspaces
US Department of Energy report Guide To Closing & Conditioning Ventilated Crawlspaces explains issues and concerns with conventional ventilated crawlspaces and provides prescriptive measures for improvements that will create healthier and more durable spaces. The methods described are not the only acceptable ways to treat a crawlspace but represent a proven strategy that works in many areas of the United States. (PDF)
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