I have searched the Q & A’s and read several different articles and the more I read, the more confused I seem to be getting.    Here is my situation:   I live in zone 6 and have an existing 12’x12’ section of my raised deck that has a roof over it.   The deck is 8-9’ above ground level and the covered section has a concrete patio below it and is constructed with 2×10’s.     I am having the covered section converted to a 3 seasons room, with insulated walls and glass.  In preparation for the room addition I will be removing the existing deck boards and replacing it with 3/4” plywood subfloor and insulating the floor.     At this point it is not my intention to heat/cool this room but I want to leave that as possible phase 2 as well as extending the spring and fall season as much as possible.    My plan for insulating the floor is as follows, starting from the 3/4” plywood, then 1.5” rigid foam between joists with canned foam to fill any gaps around that, followed by batt insulation, followed by 1” of 4’x8’ sheets of rigid foam across the bottom of the joists, and then capped off with 3/8” LP smart soffit, to make a nice ceiling appearance for the patio below.     Does this plan sound reasonable?     Some of the things I’ve read have suggested that the foam board against the subfloor would be unnecessary.    Thanks for any input you can offer.