4 Mil Vs 6 Mil Vapor Barrier (Here Are The Differences)
It is measured by mils, which are the thickness of the poly. Each mil is inch and most codes call for 6 mil, which is inches thick. However, you should not use a poly vapor barrier in your basement. Depending on what the home is made of, and where you are working, the thickness can vary. For example, crawl spaces in many homes need ...