Sagging plasterboard ceilings

Sagging plasterboard ceilings. Identified by Peter Weddell, owner/operator of Qld Home Buyers Inspection Service and Queensland Building Inspection Service, QBIS.

Sagging plasterboard ceiling danger

Some examples of ceiling linings sagging as much as 75mm above bedrooms and dining-living areas.

  • With this degree of sagging the ceilings could not be effectively resecured with guarantees against further sagging or potential for collapse.
  • The only things stopping the ceiling from collapsing were the light fittings and perimeter ceiling cornices.
  • Collapse of a ceiling lining may cause serious injuries to any inhabitants below.

Garage ceiling sagging

The light fitting and architrave surrounding access hole to the roof are the only things stopping potential collapse of this ceiling.

Sagging ceiling linings

Large gaps between the ceiling sheets and bottom Chords of the roof trusses, this shows the degree of sagging.

Rectification would require removing and replacing the ceiling sheets also the insulation, messy and expensive !

Sagging plasterboard ceilings.

Important notes: 

  • Re-securing of the ceiling sheets may not be sufficient in some cases.
  • Replacement may have to be considered, where they cannot be effectively re-secured.
  • This must be determined and allowed for in quotes given by trades people that are willing to guarantee their work.


Always ask the tradesperson if they can effectively resecure the ceiling sheets with guarantees against further sagging. If the awswer is no, then request quotes on having the linings replaced, where necessary.

For independent Building Inspections Brisbane in all suburbs, Qld Home Buyers Inspection Service.