Foam Board Insulation Crawl Space Ceiling

Two inch expanded polystyrene foam board is the favored insulation for crawl space inside walls.

Foam board insulation crawl space ceiling.

Choose the right crawl space insulation for your home. Then install at least one continuous layer of 2 inch polyisocyanurate under the bottom of the floor joists. Energy saver is here to help. This type of insulation may be faced with silver foil with the foil facing inward toward the crawl space.

Ceiling insulation 4 crawlspace 6 exterior sheathing 6 exterior wall foundation 2 floor 1 garage 6 metal building 1 re siding 4 under slab 2. 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. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. R 3 2 polyisocyanurate rigid foam insulation board model 754404 13 82 13 82.

Let s revisit this question. If you prefer to have a vented crawl space or a crawl space with uninuslated walls you can insulate the crawl space ceiling. Concrete block brick and even stone. If there is free air flow insulating the brick walls would be a waste of time and money.

Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls. Use a straightedge and a utility knife to slice through the insulation then snap the board along the cut line to get a. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. For more information on this approach what i would call the standard approach see this article.

Rigid foam glued to the foundation walls would also help if the area is fairly air tight. Remove the fiberglass batts and put them in a dumpster. This type of insulation allows for conditioned air to be introduced into the crawl space. Foam board insulation is attached directly to the exterior structure walls of the crawlspace.

As you guessed fiberglass batts won t work. It is denser than eps and provides more r value with a rating of 5 per inch of thickness. Cut each sheet of rigid foam insulation to fit the crawl space wall height. If you have cold floors above your crawl space or a damp moldy crawl space dr.

This effectively insulates the crawl space itself as opposed to insulating the home from the air in the crawl space. Building an unvented crawl space. Rigid foam insulation works for any type of masonry wall. In the summer months some ventilation in the crawl space will also help avoid excess moisture.

Most areas in the country will require insulation on the foundation walls equal to or greater than an r value of 5 in rigid foam r 5 is 1 and r 10 is 2.