When I build an arbor, I like to elevate the posts above grade on concrete piers. The posts last longer that way, and if they ever need replacing, they are easy to remove. Usually I make individual tapered forms for each pier, but this time I decided to try something different: plastic 2-gal. plant containers.
As shown in the drawing, I cut the bottoms off the containers and then inverted them over a pad of freshly poured concrete. Once the concrete set, it was a snap to pull the forms off. They stack neatly in the shed, so now I’ve got eight forms on hand for the next job. The resulting cone shape makes a neat-looking detail and is strong.
Dan Jensen, Tigard, OR