Measure the size requirements for the bench top using a tape measure. Mark down the measurements for reference.
Select the necessary amount of recycled floorboards you need based on your measurements. Measure, mark and cut the floor boards to length on a miter saw.
Lay out the floor boards on a work surface with the top surface facing up. Apply wood glue to the long edges of the floor boards where they will join together to form the bench top.
Clamp the boards together using bar clamps. Allow the glue to dry and remove the clamps.
Sand the top and bottom surfaces of the assembled boards lightly with an orbital sander. This will remove any glue and loose debris on the board. Carefully sand the surfaces without removing any of the character of the wood.
Run the long edges of the assembly through the table saw to cut off any raw edges and trim the bench top to the correct width.
Sand the edges of the bench top with an edge belt sander until they are completely smooth.
Apply a wood finish to the bench top and allow it to dry prior to using it in your project.