Rigid Foam Insulation Interior Basement Walls

Creates a finished appearance.

Rigid foam insulation interior basement walls.

Allows spacing for electrical wiring and other utilities. Styrofoam brand insulation is a rigid insulation that can be placed directly on walls framing and drywall. The correct method of using rigid foam is to run continuous 4 foot by 8 foot sheets of the foam across the concrete basement wall making the rigid foam the de facto wall. When insulating interior basement walls in a finished basement use our styrofoam brand insulation.

Use a premade kit for this type of project. The short answer is no you generally do not want a vapor barrier on the walls of a finished basement. For new construction use rigid boards to insulate slabs and the outside of foundation walls. 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.

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. 15 19 means r 15 continuous insulation on the interior or exterior of the home or r 19 cavity insulation at the interior of the basement wall. For a basement remodeling project consider insulating basement walls with foam board. The place to control vapor migration is on the exterior of the basement wall in the form of waterproofing or damproofing.

Attach the tongue and groove insulation boards to the concrete wall with adhesive. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Depending on thickness and the type of foam you choose super high effective r values can be achieved. 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.

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. Martin my copy of 2012 irc says 15 19 for basement walls in zone 5. My basement has some old insulation above the frost line as well as some 2x4s nailed down to the concrete walls. Eps is used under roofing over foundation walls and beneath siding.

A footnote explains this notation as follows. 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.