Steve and Rick explain thermal bypasses in a crawl space and how to air seal and insulate them. They also discuss vented and unvented crawl spaces and how to deal with crawl space moisture issues. This is video 8 of a multipart video series, hosted by building science consultants Steve Easley and Rick Chitwood, explain step by step best practices for home performance contracting and how to get the results that let homes save 50 to 80% of their annual utility bills.