This type of crawl space takes advantage of both the “closed” and the “concrete” crawl space strengths. In this design sealing the walls with an insulation to control energy costs also protects the crawl space from moisture penetration from the foundation walls.

A crawl space with a concrete floor either with or without foundation vents This type of crawl space is not as common but has its advantages. For one, this type of construction is more energy efficient than an open crawl space if constructed without foundation vents.

Within the last few years the building code has allowed homes built on a crawl space to be built as a “closed crawl space”. This means foundation vents are not required as long as other requirements are met. This type of crawl space is more energy efficient than an open crawl space.

Spray foam may be a good alternative for the parts of your home that are above grade, but it is not a superior product for a crawl space regardless of the salesman’s insistence that it is an “air barrier” or that it is a “moisture barrier”.

Step by step instructions on how to install a crawl space drain system.

What is an open crawl space and why does it need to be “fixed”? A typical open crawl space has open foundation vents and an exposed or partially covered dirt floor. Open Crawl Space​This type of foundation construction is very common throughout the United States and Canada....