Can foam board insulation be used in crawl space?
Can foam board insulation be used in crawl space? Instead of installing the foam insulation between floor joists in the crawl space, the foam board is installed against the crawl space foundation walls. Unlike fiberglass, rigid foam insulation does not absorb water, support mold or allow air to pass through (providing that joints between boards are sealed with tape). Does rigid foam insulation need to be covered in crawl space? Q. I plan to install rigid foam insulation in a crawlspace. As far as I know, most types of rigid foam insulation can't be left exposed but need to be...