Rigid Foam Insulation Crawl Space Floor

Glue rigid foam insulation board to the inside of foundation walls using waterproof construction adhesive and seal all seams with waterproof tape.

Rigid foam insulation crawl space floor. The best insulation material for crawl spaces is rigid foam insulation board. Proper crawl space insulation also can prevent your crawl space from becoming a moist environment that grows and harbors mold and mildew controlling crawl space temperature and moisture is a dual process that works toward a common goal. A temperate lower area that will keep upper floors warm while your home s foundation remains in sound condition. Instead of installing foam insulation between floor joists in a crawl space the foam board can be installed against the crawl space foundation walls.

Adding rigid foam insulation to your crawl space is one of the smartest things you can do to your house. Get free shipping on qualified crawlspace foam board insulation or buy online pick up in store today in the building materials department. Floors running atop will feel warmer to bare feet in the winter. A 4 by 8 foot sheet of 2 inch thick expanded polystyrene insulation r value 7 7 is 26.

Unlike fiberglass rigid foam insulation does not absorb water support mold or allow air to pass through. Rigid boards may be installed with construction adhesive or mechanical fasteners. Avoid putting kraft paper backed insulation against the walls where trapping moisture could present mold and mildew problems between the walls and the insulation. Unvented crawl spaces are suitable for unfaced fiberglass batting batting with special backing or encapsulation material designed for foundation walls and rigid foam insulation board.

To insulate the crawl space walls chappell dick wonders whether rockwool comfortboard 80 a rigid mineral wool insulation would make a good substitute for rigid foam. Unlike fiberglass rigid foam insulation does not absorb water support mold or allow air to pass through. Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls. The advantages are multiple.

This is especially true if the joints between the boards are sealed with tape. Use an insulation that resists damage. Rockwool comfortboard 80 according to the manufacturer is non combustible and chemically inert and it s made from natural and recycled materials including rock.