Fronts are always redwood and backs are plywood (thickness: 1/8") that are coated with wood sealant. Drill holes in the back before applying sealant.Use wood screws that have flat tops and a countersink drill bit that enables drilling of hole and small bevel to have screw tops lay flush with backing (not essential but my DH is persnickety with this kind of detailing. Who's going to look at the backing, right? )
