This DIY video shows step by step instructions on how to build a heavy duty shelving system. It takes about three hours to build and costs about $80. You need 1, 4 x 8, 23/32. 9, 8’ 2x4 and 5 lbs. of 3” long wood screws. Your cuts will be: 8, 21” 2x4 8, 4’ 2x4 4, 6’ 2x4 4, sheet cut to 2x4x23/32