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Dec 5, 2018 at 0:11 vote accept user3103523
Dec 4, 2018 at 23:55 comment added gnicko I don't know the name--I'm sure it probably has one tho. I don't know of any "pitfalls" except that you need to make good, strong joints and the longer the "tie-in" boards are, the more potential for weakness there is. You should be OK keeping things like a foot or less, but there's some wiggle room I suppose. Best of luck to you! Post a pic. when you're done!
Dec 4, 2018 at 22:29 comment added user3103523 Alas, the bump out is necessary, because the chimney is directly behind the drywall and inline with the studs on the left and right sides. In other words, the drywall lies flat against both the left/right studs and the chimney face--there's no pass through between the left stud and right stud. That first mock you sent is perfect--thank you! Your SketchUp skills go far beyond my own. Is there a name for this type of joining of studs? Would like to learn more about it and potential pitfalls if you know of one. Thanks again!
Dec 4, 2018 at 21:54 comment added gnicko Something like this would be best: gyazo.com/dfabcdf399ad149b8d2daa90f28cfbfe
Dec 4, 2018 at 21:43 comment added gnicko Or, if you have the room, attach the "box" directly between the existing studs and do without the "tie-in" blocks entirely. That would be best, if possible.
Dec 4, 2018 at 21:37 comment added gnicko It depends on what's between the drywall and the chimney, the depth you want to come out from the existing drywall, etc. but this is kind of what I'm picturing: gyazo.com/793e2121ea376102d18cb239621b49ac (I apologize for the rough SketchUp.... not one of my strong skills) The short tie-in pieces could be a bit shorter, but I think some kind of arrangement like this would surely hold a TV.
Dec 4, 2018 at 20:48 comment added user3103523 Thanks for the reply, Gregory. The framing/chimney behind the drywall looks like this, as far as I can surmise: <img src="imgur.com/8yy1gjY" /> I agree re: fireplace mounting; I would not like to do any mounting to the fireplace itself. I'm wondering if I built a framing box that mounts to the studs on either side of it, if that would be sufficient to bear the weight of the TV and pulldown mount. Could you elaborate on the "short 2x4s perpendicular to the existing studs" idea? I'm having trouble picturing it. Thanks again!
Dec 4, 2018 at 19:56 history answered gnicko CC BY-SA 4.0