Repairing ceiling cracks — and stopping them from coming back
Most ceiling cracks are harmless, some are warnings. This guide covers what causes them, how to repair small and large cracks properly — and why a stretch ceiling is the only fix that guarantees they never show again.
Where ceiling cracks come from
Buildings move. Temperature and humidity swings make timber and plaster expand and contract, and hairline cracks along joints or corners are the visible result. Other common causes are poorly finished plasterboard seams, old water damage and — more rarely — real structural settlement.
A fine, stable hairline crack is cosmetic. A crack that keeps growing, runs diagonally from a corner, or appears together with sticking doors deserves a professional look before you reach for filler.
Repairing small cracks
Open the crack slightly with a scraper so the filler has something to hold, brush out the dust, and fill with a flexible joint compound. Let it dry fully, sand it flush, and repaint the area — ideally the whole ceiling, because a repainted patch is always visible in raking light.
Count on a day of work including drying times for an average repair. Materials are cheap; the invisible part — sanding and repainting to an even finish — is where the hours go.
Repairing large or recurring cracks
Wide cracks, sagging sections or crumbling plaster call for more than filler: damaged zones need cutting out and replacing, or a full skim coat. At that point you are close to the cost of a new ceiling surface — and the honest truth is that even a professional repair cannot promise the crack stays away. The building keeps moving, and rigid plaster keeps registering that movement.
The fix that cannot crack
This is where a stretch ceiling changes the logic. Instead of repairing the rigid surface again, you tension a flexible membrane a few centimetres below it. The old ceiling — cracks and all — disappears from view, and because the membrane is elastic, building movement simply cannot mark it.
Installation takes one day in a normal room, produces no dust, and the existing ceiling does not need to be repaired first. The result is a perfectly flat matte, satin or gloss surface that never needs repainting.
Repair or cover: a quick decision guide
One stable hairline crack in an otherwise good ceiling: repair it and repaint. A ceiling with multiple cracks, old repairs that keep returning, or a poor surface overall: covering it with a stretch ceiling is usually faster, cleaner and permanent.
Send us a photo of your ceiling with the room dimensions and we will tell you honestly which route we would take — and what it would cost.
Thinking about a stretch ceiling?
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