How To Insulate Concrete Walls With Foam Board
Cut each sheet of rigid foam insulation to fit the crawl space wall height.
How to insulate concrete walls with foam board. The concrete should be dry and free from cracks before installing foam insulation boards. The insulation may be rigid board extruded or expanded polystyrene or polyisocyanurate closed cell spray polyurethane foam cellular glass fibrous batt or fibrous blown in insulation note however that fibrous insulation is susceptible to moisture. Simply offset the studs from the wall and the foam when applied will completely seal the wall and insulate it. After the adhesive cures add extension boxes to the outlets and switches and spray foam into every gap top bottom and around each box.
If necessary address moisture problems and seal cracks before you begin. Use a straightedge and a utility knife to slice through the insulation then snap the board along the cut line to get a. Now as you glue the panels to the exposed concrete blocks leave a inch gap at the floor and ceiling and cut holes in the panels to fit around outlets and wall switches. Interior insulation refers to insulation applied to the interior side of the concrete masonry as shown in figure 1.
Lay a panel of polystyrene.