Keep your crawl space cozy with Johns Manville Crawl Space Insulation Collection! With roll and board insulation options to help insulate you home and keep out unwanted temperatures. Our kraft-faced formaldehyde-free™ fiberglass insulation is paper-faced to help control moisture in concealed applications such as exterior walls, while our Foil-Faced Foam Sheathing board is rigid Polyisocyanurate foam sheathing that provides exceptional heat, moisture and air control to protect your building's exterior walls, and when installed correctly, eliminates all major thermal bridges that cause heat loss.