Plasterboard ceiling sagging

Cause

Insufficient number of plasterboard sheet fixings; fixings inadequate to hold plasterboard sheets; ceiling lining has had weight applied such as a person standing on the lining instead of joists in the roof space

Repair

  • prop ceiling; insert additional screw fixings; stop holes; seal new plaster; repaint ceiling

Cause

Ceiling joist spans are too great for the timber size; joists have been overloaded 

Repair

  • See 'Ceiling joists sagging'

Cause

Joists have rotted due to leaks or high roof space moisture levels

Repair

  • install a strongback across the joists, replace damaged joists with new timber or insert extra dwangs in the roof space to the fix the ceiling to; insert additional screw fixings; stop holes; seal new plaster; repaint ceiling
  • if water entry from a leak is suspected, find and fix the leak if possible; have the roof space checked for moisture levels, the extent of moisture damage including mould growth on roof framing and in walls, and condition of insulation
  • where it is suspected that the building may be leaking and there is a risk of damage, engage an experienced building surveyor to report on the building
  • also see 'Roof space dampness'

Cause

Water from roof leak wetting insulation and being absorbed by ceiling lining

Repair

  • if water entry from a leak is suspected, find and fix the leak if possible; have the roof space checked for moisture levels, the extent of moisture damage including mould growth on roof framing and in walls, and condition of insulation
  • where it is suspected that the building may be leaking and there is a risk of damage, engage an experienced building surveyor to report on the building