Sagging on a cathedral ceiling

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Old 10-01-19, 06:15 PM
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Sagging on a cathedral ceiling

There is sagging on my cathedral ceiling just below one skylight but I am told skylight is not leaking. Sagging is in circular shape smaller than a car tire in size. There are no soffit vents for this part of the roof. The roof and the skylights are 6 years old. There are three skylights and the sagging is just below the middle skylight. There are no leak stains on the ceiling inside. What would cause the sagging if the skylight is not leaking? How would you fix this problem?
 
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Old 10-01-19, 06:30 PM
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Probably replace the drywall.
 
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Old 12-19-19, 04:09 PM
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It might be condensation forming slowing swelling the roof, since the space cant breath because it's blocked by the sky light. Cathedral's are just as tricky to keep healthy as flat roofs
 
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