Foam Board Insulation Crawl Space Ceiling

Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls.

Foam board insulation crawl space ceiling.

If you have cold floors above your crawl space or a damp moldy crawl space dr. Energy saver is here to help. Let s revisit this question. 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.

Set your store to see local availability. It is denser than eps and provides more r value with a rating of 5 per inch of thickness. For more information on this approach what i would call the standard approach see this article. 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.

This type of insulation allows for conditioned air to be introduced into the crawl space. In the summer months some ventilation in the crawl space will also help avoid excess moisture. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. If you prefer to have a vented crawl space or a crawl space with uninuslated walls you can insulate the 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. Concrete block brick and even stone. As you guessed fiberglass batts won t work.

Foam board insulation is attached directly to the exterior structure walls of the crawlspace. Rigid foam insulation works for any type of masonry wall. It s better to install insulation on crawl space walls and to leave the crawl space ceiling uninsulated than it is to insulate a crawl space ceiling. The boards provide protection against the intrusion of water at the same time as protecting against the transfer of hot and cold temperatures.

Remove the fiberglass batts and put them in a dumpster. If there is free air flow insulating the brick walls would be a waste of time and money. Two inch expanded polystyrene foam board is the favored insulation for crawl space inside 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.

Rigid foam glued to the foundation walls would also help if the area is fairly air tight. This type of insulation may be faced with silver foil with the foil facing inward toward the crawl space. This effectively insulates the crawl space itself as opposed to insulating the home from the air in the crawl space. Cut each sheet of rigid foam insulation to fit the crawl space wall height.

R 3 2 polyisocyanurate rigid foam insulation board model 754404 13 82 13 82.