Tank would sit between living room and dining room in corner that has 2 walls on each side
joists are perpendicular and metal beam that runs entire length of basement looks to sit directly behind where tank sits on floors above, cant move tank back due to wall
looking at supporting underneath but looks like 1/2 of tank sits over finished portion of basement and based on ductwork/furnace, water heater no area to put floor jacks up
my lfs who is doing all work while not engineers but have been working woth them last 10yrs for all my needs and doing install was not concerned about floor
maybe im just being paranoid