In crawlspaces, a minimum of how many mils of polyethylene should be used to cover exposed ground areas?

In crawlspaces, using 6 mil polyethylene to cover exposed ground areas is standard practice due to its effectiveness in moisture control and durability. A thickness of 6 mil provides a good balance between strength and flexibility, ensuring that the barrier can withstand normal wear during installation and use. This thickness is generally considered adequate for preventing moisture from the ground from rising into the crawlspace, which can help reduce the risk of mold growth and wood rot that can adversely affect the structure of the home.

Using polyethylene of less than 6 mil may not provide sufficient resistance to tearing or puncturing, increasing the risk of moisture penetration. Conversely, thicker materials might be more expensive and less flexible, making them harder to install correctly in tight spaces. Thus, the 6 mil specification strikes an optimal compromise, making it the recommended choice for best practices in crawlspace moisture management.