When traveling with Matt Risinger, it's pretty likely that you'll make unscheduled stops at homes under construction. In this case, Risinger takes the crew on an impromptu visit to a new construction site that unfortunately has a sub-standard crawl space and some other issues. There's fans blowing, windows open, and Matt's looking at plywood! On a serious note, there are many factors to consider when dealing with crawl spaces. Ensure that your crawlspaces meet the codes set in place—these vary from IRC to local building codes. Seal your crawlspace vents. Make sure your access door meets specs, use vapor retarder, meet insulation requirements, and handle all air in the crawl space properly.