- 1). Place the three pieces of lumber measuring 2 by 6-by 45 inches between the two pieces that measure 2 by 6 by 48 inches to form a staircase landing frame that is 48 inches square with a 2 by 6 by 45 inch piece in the center. Put the staircase landing frame together with 3-inch deck screws.
- 2). Drill 1/8-inch pilot holes for the deck screws through the 2-by-6-inch material where it will be secured to the staircase. Place the landing at the bottom of the staircase. Secure it to the staircase with 3-inch deck screws.
- 3). Drill 1/8-inch pilot holes every six inches around the perimeter of the 4 foot by 4 foot by ¾ inch plywood with one row in the center. Next, drill countersink holes in every pilot hole with the 3/8-inch drill bit. Do not drill the countersink holes any deeper than 3/8-inch.
- 4). Place one piece of the 4 foot by 4 foot by ¾ inch plywood on the staircase-landing frame and secure it to the 2 by 6 inch material with 1½-inch deck screws. Install a deck screw every six inches around the perimeter and down the center.
- 5). Place the other piece of plywood measuring 4 foot by 4 foot by ¾ inches on top of the one from Step 4. Secure it with the 1½-inch deck screws every six inches around the perimeter and down the center of the staircase-landing.
- 6). Install the floor covering of your choice on the landing. It may be necessary to fill the countersink holes with spackling compound to create a smooth surface for linoleum or other sheet flooring. Be certain to sand the spackling compound smooth with the surface of the landing.
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