Make sure it s in between the 2 joists right where the wall is going to go.
How to install foam insulation on concrete walls.
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.
Do not subtract studs.
Lay a panel of polystyrene.
Interior insulation refers to insulation applied to the interior side of the concrete masonry as shown in figure 1.
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.
Secondly and this is the best way you can install a drywall to frame the wall before applying foam board insulation.
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.
Move to next board and butt tight to previous board.
Just install a block of 2 by lumber.
Against the concrete surface with the still wet glue place the insulation panels.
The concrete should be dry and free from cracks before installing foam insulation boards.
When the entire surface is covered with the panels measure vertically down one panel so that a mark is made every 24 inches.
Consider 210 square feet to be the entire amount of rigid foam insulation to purchase.
Measure the entire wall area to figure out the amount of rigid foam to purchase.
You need to install a few of these ideally every 16 18 or 24 inches.
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.
How to install rigid foam insulation between studs measure the project area.
At each mark make a horizontal line using a carpenter s level.
Apply to 2 or 3 boards at a time.
Press boards up against concrete wall and hold for a few minutes to allow bond to set.
For example the wall may be 30 feet long by 7 feet high.