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.
How to insulate between floor boards.
Insulating a slab in an existing home can be expensive and disruptive but if the slab in your home is cold it is possible to dig around the perimeter of the house and install insulation usually foam board.
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.
Add wire insulation hangers as needed to.
One side we can crawl under on the other side we will need to take up the deck boards.
Add an insulating layer under.
See pictures as the deck is close to the ground about a foot on one side and 6 inches on the other looks like the former owner put some sort of tarp on the ground.
We want to insulate the floor which is two different levels.
Working from the crawlspace measure the distance between the floor joists with a tape measure.
Four ways to insulate your floor draught proofing simply use sealant or caulking to fill the gaps between your floorboards and between skirting boards and the floor.
Transfer each measurement to a 4 by 8 foot sheet of rigid foam insulation.
Step 2 score a line on the metal backing with a utility knife then cut along the line with a drywall saw to make pieces of rigid foam that will fit between the joists.
If it fits proper with no space between on either side of the board pick it up and put a thin layer of glue on.
Place it into the space between your existing floor joists relying on friction to hold it in place.
Cut your insulation to size using a utility knife.
If it you need to spread it use a brush to help cover and smooth out the glue.