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nsmith0723 t1_jaact74 wrote

The correct way would be to either put in enough joist to support that big of a live load or more likely you should probably just have a beam going crossways below the fireplace with some posts or even a 2x6 wall underneath the fireplace. Ofcourse this isn't ideal if it's a finished basement, that might be right in the middle of a living room, but me personally I would get some wood between that fireplace and the cement floor. Your right to be worried, it's going to be cheaper to fix it now

Edit: you'll probably need to cut out the cement floor and put in some real footings too honestly, god knows what they have for a floor and I bet it doesn't have rebar. Even spread across a long 2x6 wall would be pushing your luck with say a 2000lb+ fireplace. I highly doubt your going to get a joist to hold that with any span over say 10ft

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willxthexthrill OP t1_jaaqmo1 wrote

Here’s some pics. The first one shows under the fireplace from the side. The right hand is the front of the fireplace and you can see an area of concrete or mortar which is the fireplace floor. The red arrow is pointing at the crack.

https://imgur.com/a/Wa3akM8

The second is a close up of the crack.

https://i.imgur.com/5czNq1G.jpg

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nsmith0723 t1_jaay0sz wrote

Jesus, I would get some poll jacks under that asap. Dont try to lift it, just hold it in place. The floor probably won't handle the entire load. I think your going to need some professional help with this one I think. I mean if you really love that fire place I would be tempted to just anchor it in place where it is with 3 6x6s and some nice big wide fat footings. You may also want to consider just getting rid of the fireplace. They cause so many issues, next you'll be redoing the roof because its leaking. But that's not cheap either. Trying to lift those things sketchy, but it's also super sketchy now and it would be all around better if it was entirely vertical again. Hard to say what's best

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