How To Install Foam Insulation On Concrete Walls

Do not subtract studs.

How to install foam insulation on concrete walls.

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. Use 2 2 inch lumber for the studs and 2 3 inch lumber for the top and bottom plates. Make sure it s in between the 2 joists right where the wall is going to go. Apply to 2 or 3 boards at a time.

For example the wall may be 30 feet long by 7 feet high. 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. Apply liberal quantities of liquid nails or other suitable bonding agent to the back of the foam insulation boards and spread over the whole board. At each mark make a horizontal line using a carpenter s level.

Secondly and this is the best way you can install a drywall to frame the wall before applying foam board insulation. Consider 210 square feet to be the entire amount of rigid foam insulation to purchase. If necessary address moisture problems and seal cracks before you begin. After the adhesive cures add extension boxes to the outlets and switches and spray foam into every gap top bottom and around each box.

Interior insulation refers to insulation applied to the interior side of the concrete masonry as shown in figure 1. Just install a block of 2 by lumber. You need to install a few of these ideally every 16 18 or 24 inches. Firstly you can apply it directly onto the house s concrete walls with the help of a construction adhesive that will hold it in place.

Against the concrete surface with the still wet glue place the insulation panels. How to install rigid foam insulation between studs measure the project area. Measure the entire wall area to figure out the amount of rigid foam to purchase. Move to next board and butt tight to previous board.

Press boards up against concrete wall and hold for a few minutes to allow bond to set. That is between a floor joist and rim joist if this wall is backing the concrete wall.