Subfloor for new covered 3 season porch?
I am planning a new 12’x12′ 3 season covered porch attached to the house in far northern Minnesota. The footings are pinned to solid ledge rock, so there is no chance of this thing moving. I’m using pressure treated ledger and 2x10s joists.
The porch will be about 4′ above the grade. The underneath of the structure will be protected from critters by heavy screening and a trellis. However, it will be exposed to outside air movement and temperature and humidity swings.
Question? Should I put in a pressure treated subfloor? I can’t seem to find any pressure treated that has tongue and groove edges. Or is a normal 3/4″ T&G subfloor good enough?
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