Making a bench is a matter of having the right size boards and tools for cutting. Items needed include cedar or redwood post. Planks are necessary for the job as well, along with cement or nails, but this depends on preference. Loose boards can be to make the bench as well.
Gather the wood
Use wood that is termite treated. Cedar or redwood post are ideal types of wood to use, and it should be a minimum of 4 inches thick. Boards should be 4 feet by 4 feet; they should also have planks that are 2 feet by 8 feet, 2 feet by 10 feet or 2 feet by 12 feet. A combination of boards can comprise a bench that is anywhere from 8 to 12 inches wide as well.
Cut the wood
Cut the uprights anywhere from 36 to 38 inches long. Cut a notch for the 2-by-4 or 2-by-6 cross member. The cross member should rest in the notch so the top is square.
Confirm the look of the bench
For an 8-foot long bench, the upright posts should be no greater than 6 feet apart. Two 4-by-4 pieces can be used to support a span of 10 feet as well. Benches should be 4 to 8 feet in length with a foot or less of overhang on each side.
Establish a base
Cementing the upright posts is an option, but the wood rots faster. Nails can be used instead for the bottom post at the sides. Ensure that the small and long cross members are secure before the base is nailed. The upright post and long cross member should be level before nailing.