Best Insulation For Crawl Space Ceiling

Blown in or loose fill insulation insulation blankets batts and rolls spray foam insulation and foam board insulation.

Best insulation for crawl space ceiling. Note that the material the insulation is made from will change the r value as well. Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls. You can install the board against the crawl space foundation walls instead of between floor joists.

In order for fiberglass to work properly it needs to be in a clean dry space and an open crawl space is not that place. Rigid foam insulation works for any type of masonry wall. For many years the standard way to build a crawl space involved venting the crawl space walls and installing fiberglass batt insulation between joists in the crawl space.

The best insulation material for crawl spaces is a rigid foam insulation board. The fluffy fiberglass center makes a perfect place to build a nest. Fill the ends of joist bays with rectangles cut from rigid board insulation.

Use caulk or foam sealant to seal the joint between the top. Snakes spiders and squirrels have also. This type of insulation may be faced with silver foil with the foil facing inward toward the crawl space.

Concrete block brick and even stone. The best insulation material for crawl spaces is rigid foam insulation board. Mice love old insulation.

Unlike fiberglass a properly sealed foam board does not absorb water support mold or allow air to pass through. Two inch expanded polystyrene foam board is the favored insulation for crawl space inside walls. If a moisture barrier is required or recommended in your climate zone you will want to use the faced board again reflective facing is a good choice to insulate your walls.