Building Code Says 6 Mil Is Fine. That Doesn't Mean It's Good

Send us Fan Mail Are your vapor barriers actually protecting your home? Learn why building code minimums often fall short of real protection. The International Residential Building Code sets a minimum requirement of 6 mil polyethylene plastic for a crawl space. However, meeting this code standard does not mean you have the best protection for your home. While 6 mil plastic technically satisfies the rules, it is often comparable to thin contractor trash bags rather than a durable, long-term s...