Foam Board Insulation Crawl Space Ceiling

Cut each sheet of rigid foam insulation to fit the crawl space wall height.

Foam board insulation crawl space ceiling.

Rigid foam insulation works for any type of masonry wall. Choose the right crawl space insulation for your home. Rigid foam glued to the foundation walls would also help if the area is fairly air tight. 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.

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 the rigid pink or blue panels that can be found at home centers in many different thicknesses. Energy saver is here to help. Foam board insulation is attached directly to the exterior structure walls of the crawlspace.

Then install at least one continuous layer of 2 inch polyisocyanurate under the bottom of the floor joists. If there is free air flow insulating the brick walls would be a waste of time and money. As you guessed fiberglass batts won t work. This type of insulation may be faced with silver foil with the foil facing inward toward the crawl space.

R 3 2 polyisocyanurate rigid foam insulation board model 754404 13 82 13 82. The boards provide protection against the intrusion of water at the same time as protecting against the transfer of hot and cold temperatures. Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls. For more information on this approach what i would call the standard approach see this article.

It is denser than eps and provides more r value with a rating of 5 per inch of thickness. 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. Building an unvented crawl space. 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.

Let s revisit this question. Set your store to see local availability. If you have cold floors above your crawl space or a damp moldy crawl space dr. 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.

Concrete block brick and even stone. This foam board insulation is available with straight or tongue and groove edges to help limit air movement. Remove the fiberglass batts and put them in a dumpster. If you prefer to have a vented crawl space or a crawl space with uninuslated walls you can insulate the crawl space ceiling.

In the summer months some ventilation in the crawl space will also help avoid excess moisture.