- 1). Remove all furniture from the floor so that it is completely clear. Clean up debris and dirt from the floor using a broom or a vacuum. Place polyethylene plastic sheets over the entire floor. Overlap the sheets by at least 3 inches. Place a strip of duct tape along the length of the seam. Cut the excess plastic with a utility knife.
- 2). Set pressure treated 2-by-4 inch boards along the perimeter of the basement flat side down. Use a tape measure to determine the lengths of 2-by-4 inch boards that will be needed. You can cut the 2-by-4 inch boards using a circular saw or miter saw.
- 3). Secure the 2-by-4 inch boards to the concrete floor using a power actuated nail gun or ram set. Place a nail every 2 feet along the boards.
- 4). Set and secure 2-by-4 boards, flat side down, to create a grid pattern within the 2-by-4 perimeter. Use the tape measure to determine the length needed for the boards.
- 5). Place rigid foam insulation within the grid you created with the 2-by-4 inch boards. Cut the insulation to size using a circular saw, if necessary.
- 6). Set plywood sheeting on top of the grid of 2-by-4 inch boards. Measure the plywood with a tape measure; cut it to the needed size with the circular saw, if necessary. Secure the plywood sheeting to the 2-by-4 boards with screws using a power drill.
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