Rigid Foam Insulation Interior Basement Walls

Rigid foam insulation on interior basement walls on september 23 2020 by amik unvented insulated crawles basement insulation building science insulated basement wall panels eps xps foam insulation styrofoam best methods for insulating basement walls.

Rigid foam insulation interior basement walls.

Attach the tongue and groove insulation boards to the concrete wall with adhesive. Allows spacing for electrical wiring and other utilities. On the interior the best insulation to place against the concrete or block is rigid foam without any facing such as foil or plastic sheeting. The short answer is no you generally do not want a vapor barrier on the walls of a finished basement.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. For new construction use rigid boards to insulate slabs and the outside of foundation walls. For a basement remodeling project consider insulating basement walls with foam board. A footnote explains this notation as follows.

Martin my copy of 2012 irc says 15 19 for basement walls in zone 5. 15 19 shall be permitted to be met with r 13 cavity insulation on the interior of the basement wall plus r 5 continuous insulation. After that thin furring strips are installed on top of the foam to provide a firm base for the drywall screws and drywall but can you run rigid foam between the studs just as you would do with fiberglass rolls or spray foam. When insulating interior basement walls in a finished basement use our styrofoam brand insulation.

Eps is used under roofing over foundation walls and beneath siding. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Creates a finished appearance. Use a premade kit for this type of project.

My basement has some old insulation above the frost line as well as some 2x4s nailed down to the concrete walls. One disadvantage of rigid foam is for it to be effective it must be attached directly to the wall using adhesive or idp foam insulation anchors. Rigid foam panels are also a good way to insulate on the inside of concrete basement walls. Depending on thickness and the type of foam you choose super high effective r values can be achieved.

The place to control vapor migration is on the exterior of the basement wall in the form of waterproofing or damproofing. We are going to finish the basement and remove all of the old insulation we ve seen some small skinks lizards hiding in there as well as on our porch and we want to use xps boards along the walls before studding out and drywalling.