Step 1
Measure the height of your ceiling with a measuring tape. If the height of the ceiling varies significantly in different places, you may need to build several dead men, one for each ceiling level.
Step 2
Cut a 2-by-4 with a saw to the height of the ceiling, less 4 inches. For example, if your ceiling is 96 inches, cut the 2-by-4 so that it is 92 inches long.
Step 3
Cut a second 2-by-4, this time to roughly 3 feet.
Step 4
Lay the small 2-by-4 on top of the large one to form a large T.
Step 5
Attach the small piece to the large piece, using long wood screws and a screw gun.
Step 6
Attach braces to each arm of the T if the dead man seems wobbly. To do this, cut two small sections of 2-by-4 and attach them to the underside of each arm with screws. If you only need the dead man for one small job, this is probably unnecessary.