Possible Causes of Your Sagging Ceiling Plaster

You shouldn't ignore a dangerous sagging ceiling, which could potentially collapse and fall on top of someone, causing stress and injury. A new plaster ceiling replacement will keep your home safe and secure and forestall any catastrophes. You may wonder what causes a ceiling to sag in the first place. Several possibilities follow below.

Roof Leaks

Rainwater can leak into the roof cavity without you being aware of any danger. You might notice one sign, however: an expanding dark mildew patch that spreads across the ceiling. Moisture buildup can also rot the timber beams and ceiling joists that attach to the plaster. Additionally, it can soak insulation. The heavy damp plaster will eventually fall away and begin to sag and bow. 


Termites or white ants love to feast on timber. Unfortunately, they could munch their way through the structural beams that hold up the ceiling, called the ceiling joists. Then the plaster can drop as the supports disintegrate.  


The foundation and skeleton framework of a house support the walls, ceiling, and roof cladding. Sometimes the foundation can settle and shift in tiny amounts within the earth. The building frame can expand and contract due to temperature fluctuations, the movements of which can loosen the attachment of the ceiling and beams. A minor earth tremor may also all shake up the joins between the building bits and pieces.

Building Problems

Some ceiling problems result from lazy installation techniques that cause it to sag. For example, only thick and sturdy plaster should go over a ceiling, whereas yours may use flimsy plaster. Or else, the fastenings or support beams might extend too far apart to hold the plaster up firmly. 


Old age provides another possible reason for sagging ceilings. Over time the adhesives, screws, and other fasteners of the entire building can work themselves loose. This wear applies to the ceiling also, which can sag as a result. Alternatively, a relatively new building tends to settle with the first two years or so, which can destabilise the ceiling.

Thus, your ceiling can sag due to various causes. A hole in the roof cladding may let rainwater flood the roof cavity to dampen the ceiling plaster. Termites might feast on the roofing beams, or else the foundation and framework might shift within the earth. Other causes include structural problems caused by age or incorrect installation of the ceiling in the first place.

For more information or help, contact a plaster ceiling repair service.