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Edited original question: Horizontal heating supply stack (4X15) runs between 2x8 joists under bathroom. The take off for the above bathroom register is located 4" from a rectangle to round connection (round to downstream register). When installed, the 'rectangle to round' connection point sits below the plane of the ceiling - one corner is 3/8" lower than the joist. The original drywall was installed 'around' this. The ceiling was coming down. I removed a section of ceiling to see why. It showed no signs of having been wet. Just force over time - and the quarry blasting every day - pushed the drywall away.

I asked if it would be safe to jack the duct work up - deform it without affecting anything else. Would the force of the jack cause the take off connection for the bathroom register to fail? The corner of the 'rectangle to round' connection would need to be moved up 1/2". If the take off to the bathroom register failed, I'd have to remove a recently tiled floor.

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  • That is incredibly hard to read and digest, Please add the missing words. I can not quite understand the intent or the situation you are trying to describe. – Alaska Man Mar 13 at 21:42
  • Are you sure you do not have a water leak? Most drywall should hold up duct work, it is mainly light tin. – crip659 Mar 13 at 22:20
  • Are you talking ducts. as in air movement places, or ducts as is plumbing/water/waste pipes? – crip659 Mar 13 at 22:30
  • you kind of answered your own question ... can I jack it up? ... I doubt I could 'crush' it to make it fit. ... crease the duct so that it can fold a bit and use a hydraulic jack to push it up – jsotola Mar 13 at 23:12
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    A (clear, focused) picture is worth 1000 words. You may want to include one to help us out. – FreeMan Mar 18 at 14:30

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