Things You'll Need
Instructions
Measure 1 foot from each end of the 12-foot beam and mark a straight line across the 4-inch width. Also mark the center of each of the 4-inch lines for your drill holes. Mark the best surface of the beam as this will be the top you walk on. Mark the 8-foot board at 2 feet, 4 feet, and 6 feet. Find and mark the center of each line at the 2-foot and the 6-foot marks.
Cut the 8-foot board at the 4-foot mark. This will prevent your walking beam from tipping and it will be movable, making yard work easier.
Drill 1 and 1/8-inch holes 1 inch deep on all four of the center spots marked. These holes will provide a recessed area to hide the head of your lag bolt.
Use the 3/8-inch drill bit to create pilot holes for the lag bolts in the center of the 1-inch holes you just drilled. The pilot holes should go all the way through the beam and all the way through the 2-inch depth of the 4-foot sections of 2-inch-by-4-inch board.
Connect the 4-foot base boards to the beam using the 6-inch lag bolts with locking washers and nuts. Because you cut a 1-inch recessed hole, the 6-inch lag bolt should be just long enough. The recessed area should be on the top side of the beam and on the bottom side of each 4-foot section.
Fill the recessed holes on the top side of the beam with wood filler. Allow time to dry.
Sand the wood filler areas on the beam as well as any other rough spots to prevent slivers. You may want to sand the 4-foot base boards as well.