Partial basement reno
I am planning on removing and replacing old walls in my basement in hopes of making it a more comfy living space.
The house was built in the late 1920s I believe.
The existing basement walls seem to be 2x2 studs and either wood chips (I know crazy), or fibreglass in between the studs, no vapor barrier and plywood walls. The subfloor is raised the width of a 2x4 (ie. 4 inches up). I'm not sure what moisture issues I will find when removing the walls but I plan to address them as I go. The basement seems to need dehumidification in the summer but there is no obvious moisture issues. On unfinished walls in the unfinished furnace/laundry room space maybe a little efflorescence.
Here's my plan. I plan to leave the subfloor in place as this would be cheaper than demolishing it and likely repouring concrete. I then plan on putting 2" XPS board on the walls and 2X3 studs over that and drywall over that.
I guess this is where I need some advice:
Should I be sealing the walls with something assuming they are not sealed already or will the XPS board be enough? If there is some efflorescence showing on the walls can I put the XPS board over this? Is all this worth it if a don't plan to do anything with the floor (ie. insulate it)? Lastly, do inside basement walls between finished and unfinished space need to be insulated or is this a no-no?
Thanks for any advice. In a perfect world if I had a lot of cash I'd hire out to get the basement done-up properly from scratch but I don't have the cash so I thought just replacing the walls might help the space become a little more comfy.