attaching deck boards from below
I am adding a deck to the front of my house. Since it is a post & beam house I figured I might as well make it a post & beam deck. I am using locust for all the structural parts. I mill each piece from a log on a woodmizer mill. The joists are 8 by 6. Each end is secured with a housed dovetail. I am using pau lupe for the decking. I don’t want to surface nail. After looking at the different deck clips or deck ties a friend of mine suggested the following idea. Attach a 1 by 10 (pressure treated) to the top of each joist running parallel to the joist. This would leave 1 3/4″ extending on each side of the joist. I would then screw the deck from below through the 1 3/4″ overhang. This is just as easy as any of the deck clips on the market. The only disadvantage is that the deck is now 3/4″ higher. Does anyone see a problem with a board as wide as a 1 by 10? Would pressure treated plywood be better? Does anyone see any problems with this idea?
Is the porch going to be covered? I think a 9 1/4" joist is inviting a few water issues. If the porch is not covered, you may try putting an Ice and Watersheild or flashing over the joist and then fastening with EB-TY's.
3/4 pressure treated lumber splits easy, and you could create a moist environment with that wide of an overlap. Pressure treated plywood might be better suited, but also might delaminate over time. I would consider using a product made for this application myself. The locust should last about forever, so you should try to find a solution that will be very durable.