A demountable and reusable canopy is provided comprising a number of vertical supports, located along an area to be covered, each including a footer which mounts an insert tube below the finish grade of the ground and a post having a hollow interior shaped to receive an exposed portion of the insert tube. A beam is secured to the vertical supports by self-tapping screws which extend into screw cases formed in the posts, and adjacent beams mount decking sections to form the completed canopy.