There are two most important varieties of crawl spaces: vented and unvented. Each kind requires a special method of insulation. 1. Exception: Insulation shall be placed for the walls when the following issue exists: 1. The shut crawl space is intended to be an intentionally heated or cooled, conditioned space. https://crawlspacerepaircontracto32198.wiki-promo.com/654432/the_fact_about_crawl_space_insulation_hanover_that_no_one_is_suggesting