1 if the joists are exposed at the moment and easily removed and reasonably square you might be able to flip them over.
Sagging joice attic ceiling.
Or add furring strips and a second layer of 5 8 in.
At the time of construction nails rather than screws regularly were used to attach wood lath to joists and the nails had slipped right out.
Unsightly ceiling joist sags are a common occurrence in old ceilings.
Spacing of ceiling joist or trusses.
You can correct a sagging ceiling by overlaying a two piece strongback on the joists.
If your ceiling drywall is.
If it is sagging because it got.
Then use idea 2 below to really beef it up.
A general contractor sistered new joists to the existing ones.
Sometimes they come about when different materials are used between the frame and the joists.
They often occur because of warps from weather and temperature.
You either have to replace 1 2 in.
Cracks on a sagging or bowed ceiling.
If a ceiling is bowed sagging or dropped down then the reason may relate to a structural issues.
How to fix sagging drywall ceilings.
If the ceiling joists or trusses supporting the ceiling drywall is spaced too far apart then sagging may result and the stress from this may create.
Sagging in a ceiling may be caused by undersized drywall.
Undersized joists in the attic floor had bowed and then the keys in the plaster ceiling pulled away from the joists.