Crawl Space Encapsulation

Crawl spaces are typically the dampest and least conditioned area of the home. Managing air infiltration and moisture in the crawl space are critical to maintaining good indoor air quality in the home. We often apply closed cell spray foam for this application, due to its air sealing, moisture proof and thermal boundary properties. A good vapor barrier should be in place on the crawl space ground with a minimum thickness of 6 mil.

• Conditioned Crawl Spaces: Conditioned crawl spaces are typically connected with a basement with the air communicating freely with the conditioned basement space. Today’s codes say that they must include a supply and return duct. However, earlier homes rarely include these features. The standard practice is to insulate the walls and rim joists providing for a good air and thermal boundary.
• Unconditioned Crawl Spaces: These are not freely connected with any living space. They are often under the entire home and have an exterior access. HVAC ducts and equipment are commonly located in these areas and their performance suffers as a result of operating in the adverse temperature conditions. Plumbing pipes are at great risk of freezing and breaking. Typical application would be to insulate the sub-floor to a minimum of R-30 and encapsulate pipes and HVAC ducts as much as possible. Walls are typically not insulated in the unconditioned crawl unless it is being converted to a conditioned crawl space.