Partially Finishing a Basement
Looking to partially finish my basement with two unfinished spaces. One will be where the furnace and water heater sits and the other will be where electrical box, oil tank and forced air systems sit. My plan is to use 2″ foam, stud wall with rockwool against the concrete area of finished spaces. Floor system will be foam, OSB and rubber (gym) or LVT (den / bathroom). My concern is the transition interior walls between unfinished and finished parts of the basement.
I had planned to leave the unfinished spaces as bare concrete walls and floors as both cost and ability to cut around existing utilities make finishing those walls undesirable. I can build the 2×4 walls and batt with rockwool, but can’t put foam on the unfinished side of the wall due to fire rating issues (note: Dow Thermax not an option I’m considering on those walls due to cost). Should I put a vapor barrier on the unfinished side of the interior walls? Other options to consider?
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