- 1). Wash the walls off with a power washer. Cleaner walls allow the adhesive to hold better.
- 2). Measure and cut the boards to fit on the wall with a utility knife.
- 3). Spread Styrofoam adhesive on the back of the first insulation board.
- 4). Place the board vertically against the wall in one corner. Press it firmly against the wall to allow the adhesive to get a firm grip on the concrete.
- 5). Continue installing foam boards along the bottom of the walls until it's complete.
- 6). Measure and cut boards for the second row. You will place these boards horizontally on the wall.
- 7). Install the boards in the second row directly above the top of the boards in the first row, using the same technique.
- 8). Cover the seams between the adjoining boards with installation tape.