Floor support rails installed. They are cut down pressure treated 2×4’s to 2″ tall, to accommodate 2″ foam insulation. The fasteners used are 1-3/4″ self tapping hex head screws with a washer head. They are countersunk into the wood. I’ll be applying some sealing primer to the untreated surfaces of the strips, as well as the underside of the plywood that will be laid on top.
