I built a 16×16 screened porch with cathedral ceiling on my house with the idea of eventually installing windows and insulating it for year round use. I have access from below, so I can insulate under the floor and then close up below with PT plywood or t&g siding. I have 1×4 mahogany decking running across my p.t. joists, and I’m looking for ideas about finishing off the floor without having to remove this as the exterior walls are built on it. I suppose I could lay t&g flooring over the mahogany and install thresholds at the doors. Or add a layer of 3/4 plywood and tile it??? Hmmmmm. Guidance requested.