Fix it
Why is my ceiling sagging?
Drywall sags when it has been wet, overloaded, or was never fastened well. A gentle pillow between joists reads very differently from a spreading bulge — the second one is urgent.
What it usually is
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Water saturation from a leak above
Wet drywall loses its stiffness and bellies between the joists. Even after it dries it rarely regains full strength, and the paper face can hide trapped water for days.
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A past leak that broke the fastener grip
Repeated wet-dry cycles let screws and nails tear through the softened board, so panels droop along their edges even when everything is now dry.
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Insulation or storage weight from the attic side
Blown-in insulation piled unevenly, or boxes stored on furring, pushes ceilings down over time — the sag lines up neatly with what sits above it.
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Undersized fasteners on an older ceiling
Ceilings hung decades ago with nails alone slowly let go, especially under a poorly ventilated attic where humidity cycles daily.
Safety first: A ceiling bulge that is visibly growing, dripping, or cracking at the edges can come down without much warning. Keep the room clear and deal with it the same day.
What you can check yourself
Press the sag lightly with a broom handle: solid and dry means a fastening or weight problem you can plan around; soft, damp or crumbly means water. Check the attic above for wet insulation or storage sitting on the drywall. Keep people from lingering under a pronounced bulge.
When it’s a job for a pro
A water-caused sag needs the source stopped, the cavity dried and the damaged board replaced — patching over it traps moisture. A restoration partner can tell whether the panel can be re-fastened or has to come down.
Re-fastening a dry sag can be a few hundred dollars; replacing a water-damaged ceiling section with drying typically runs $500 to $2,000 depending on size and what caused it.
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