Drywall thickness

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Old 04-18-20, 07:50 PM
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Drywall thickness

The ceiling joists in my house are 2x4 and 24" on center and span 25feet. I am replacing the ceiling because it was sagging/pillowing. Should I use 5/8 or 1/2 lightweight drywall to prevent sagging. Previous drywall thickness is 1/2. Should I sister 2x6 or 2x8 before adding the drywall or add new joists 16on center or cross brace?
 
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Old 04-18-20, 08:56 PM
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Seriously? 2x4 joists that span 25 feet? Who took out the supporting walls? Or do you have trusses? If trusses, use 5/8" drywall, running perpendicular to the joists.
 
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