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Installing a mahogany t&g porch floor

joyboy's picture

I am looking for recommendations on installing a mahogany t&g floor on a 10’ deep x 28’ wide covered porch on a new home being built in Connecticut.  The joists were set 16” on center perpendicular to the house so I am planning on running the floor parallel.  I have been looking at a 1x6 t&g mahogany to be finished with either a wax or oil finish.  I heard once of using 5/8 PT plywood as an underlayment to add strength and ease installation but I am concerned with moisture between layers.  Does anyone have recommendations as to the best technique for laying a mahogany t&g porch such as this?