Crawl Space Encapsulation and Repair Products
Crawl Space Vapor Barrier Material
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Closed Crawl Space

A closed crawl space is one that was built 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.

The crawl space still needs ventilation

If a crawl space is built without foundation vents it is still required to have ventilation. The two most common configurations are:

  1. Ventilation using the air from the home- via openings in the floor


  1. Ventilation using the forced air (furnace) system of the home

Continuous vapor barrier on the floor

There needs to be a continuous vapor barrier, rated at less than 1 perm, laid on the floor with all seams lapping at least 12″.


There are two insulation methods allowed in a closed crawl space:

  1. Insulating the perimeter foundation wall


  1. Insulating the floor joists (crawl space ceiling)

closed crawl space


  1. Generally, the vapor barrier is loosely installed preventing proper moisture control from the earth floor.
  2. There is no moisture protection from the crawl space walls.
  3. Odor can still be a problem with a closed crawl space.
  4. Generally speaking storage is not an option.

CrawlSpace Concepts | A Michigan Company

Crawl Space Encapsulation & Vapor Barrier Supplies

Below you will find categories related to crawl space encapsulation, crawl space repair, water problems etc.

What is crawl space encapsulation?

Crawl space encapsulation is a generic term used to describe a crawl space that is protected from moisture by using a crawl space vapor barrier on the floor and walls. There are different ways to accomplish this, as well as different results, depending on the "system" you purchase. If you hire a company or franchise to finish your crawl space make sure you get the most for your money. Crawl space encapsulation alone will help reduce moisture and improve the environment of the crawl space, but there are other components to consider like; the quality of the crawl space vapor barrier, how to close the foundation vents permanently, crawl space insulation, sealing the crawl space vapor barrier to the foundation wall, conditioning the crawl space, crawl space moisture control and lowering the homes energy costs.

To help in navigating our website we have listed the major crawl space repair subjects in category view below. Click on the headlines to learn more on that subject. The words in orange are links and can be clicked on for more information.

Please feel free to contact us if you have a question not answered on our site.

"We love to hear from our customers, even if you just have a question."
-Matt Leech CEO

CrawlSpace Vapor Barrier Products