Is there a simple and secure rack which will store panels against a wall?
Cut two 2 x 4’s so that the length in inches of each is half the number of stored sheets plus 7”. Then nail a 3″ 2 x 4 block flat on each end of the 2 x 4’s. The panels will stack snugly between the blocks (Photo A). Example: for 20 sheets, cut two 17” 2 x 4’s and four 3” blocks. This will keep the panels off the slab and stored tightly together. One door hinge mounted securely to the wall slightly above the stack with an upside down ‘’L’’ shaped arm will prevent the stack from falling over and allow for easy removal.