Sealed Crawl Spaces 02.05.2015

Scientific research and built examples demonstrate how properly closed crawl spaces can provide much better moisture control than conventional, wall-vented crawl spaces in temperate-humid climates.  Homes with closed crawl spaces–often called “sealed,” “unvented,” or “conditioned” crawl spaces–also can save significantly on energy when compared to homes with wall-vented crawl spaces. (

Bizios Architect has been designing homes with sealed crawl spaces for years. The images below illustrate crawl spaces we have designed that are now providing better moisture control and energy-efficiency, contributing to better places for living.

8.11.06 site visit081. A key component of sealing a crawl space is the

placement of a vapor barrier on the ground.






8.11.06 site visit222. The walls of a sealed crawl space must be sealed as well.

This image shows the layers of masonry,  with the vapor barrier

& then insulation on the inside.






8.11.06 site visit013. Subcontractors must check the proper installation of the vapor barrier

in the crawl space during construction.






4. Goulet Wade_141215_012It is important to properly locate and weatherproof the

entrance to a sealed crawl space.  A “clam shell door” is one way

to efficiently seal off the entrance. (





Follow this link to learn more about the advantages of sealed crawl spaces and how they work. (Article courtesy of

Photos by Bizios Architect