Better to spray foam walls or crawl space/floor?

Hi, I’m building a 20×20′ apartment. I know I’m doing flash-and-batt in the cathedral ceiling (2×8″ rafters with 3.5″ of closed cell + 3.5″ batts). For the walls/floor, my plan… Hi, I’m building a 20×20′ apartment. I know I’m doing flash-and-batt in the cathedral ceiling (2×8″ rafters with 3.5″ of closed cell + 3.5″ batts). For the walls/floor, my plan…Read MoreGreenBuildingAdvisor