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I closed a skylight and floated the ceiling level. A few months later it started cracking and falling, why? I don't think it was too thick.

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    Is it cracking directly off the paper of the drywall? If so, I'd suspect dust interfered with the bond. Are there any signs of moisture intrusion? – Aloysius Defenestrate Dec 12 '19 at 3:59
  • Does the roof move? under wind load or snow load etc? – Solar Mike Dec 12 '19 at 7:45
  • Hello, and welcome to Home Improvement. Would you add a picture of the damage? – Daniel Griscom Dec 12 '19 at 12:18
  • I agree with aloysius dust can be a leading cause, also mud that is dry , on pre mix work any water back in that has separated and sometimes more is needed. – Ed Beal Dec 12 '19 at 15:08
  • Was there some grease? (Example: one of my children played a game, dip Q-tips in vaseline, toss in the air, watch them stick to the ceiling. I ended up with a greasy ceiling.) – aparente001 Dec 15 '19 at 16:28
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Mud is pretty forgiving as regarding 'stickiness' but it won't cope with much movement, usually expansion and contraction will cause cracks.

  • Could be the materials you used have dried out (framing shrinking etc.).
  • Could be temperature related; i.e. expansion/contraction. Did you insulate the space over the drywall?

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