I'm building a workbench for my garage that folds up against the wall. The workbench will be 13 feet wide and 3 feet deep. Both ends of the workbench will be supported directly. The back of the workbench will be supported by the hinges that connect it to the wall. I plan on using a support header to bear the weight of the front across the full 13 feet. I was thinking of using a double 2x6 header for this, but I'd like some validation that this will support the weight. I don't plan on having the workbench hold anything extremely heavy but it should easily be able to hold a 12" miter saw and a full project's worth of wood simultaneously. Any thoughts on how verify that my header will support this?
It has the dual 2x6 header to support the 13 foot span. It uses a cleat beneath the hinge edge so that the loaded weight is supported by the wall instead of the hinges. The hinges (shown in blue) are placed underneath the 3/4" MDF bench top. This way the top is all smooth and the MDF can be replaced without dismantling the full bench. Please let me know if you see problems with this design. I'm thinking I'll use this hinge.