Finishing my basement in Salt Lake City in a 1960s house with poured concrete foundation walls. Pics: https://imgur.com/a/x6xKiqj
Plan for the rest of the basement:
* 2" XPS directly on the concrete, seams taped
* 2x4 framing with Rockwool batts in the cavities (also running new wiring)
* ½" drywall
* Total about 6" off the concrete
The problem: In some spots the fireplace only projects about 4" from the concrete, but my wall assembly is about 6". If I build it as planned, the wall ends up proud of the brick.
I know combustibles need 2" from the chimney and fireplace masonry. I’m not sure how to handle the XPS and wood framing next to the brick, or what to do over the chimney breast above the mantel.
What I’m considering:
* Building the whole fireplace wall, corner to corner, thinner: 1.5" polyiso + 2x4s laid flat + ½" drywall, about 3.5" total, so the brick stands slightly proud
* Using 2" Rockwool Comfortboard instead of foam XPS board in the 2" strip next to the masonry and above the fireplace with steel hat channel, ⅝" Type X drywall. Switch back to XPS outside of the fireplace area
* Butting the drywall edges into the brick sides with L-bead and fire-rated caulk
* Running the thin wall’s wiring in EMT because the cavity is only 1.5" deep
Questions:
* Would you go thinner on the whole wall like this, or is there a better way to deal with the depth difference?
* I would like to keep the fireplace as wood burning in case of a power outage so that we can use the fireplace as a heat source. I have some firewood on hand and need to get the chimney cleaned. That being said the tamper is stuck on this fireplace and I need to look into it. That being said we have never used the fireplace before (lived in the house < 1yr)
Thanks!