Ceilings – timber boards cupping

Causes

Cupping occurs because boards are drier on one side than the other resulting in uneven shrinkage, so cupping may indicate a higher moisture level in the ceiling space or a higher moisture level in the room

Listed under: Interior, timber and wood-based, timber, ceilings, roof space, moisture

Cause

Cupping occurs because boards are drier on one side than the other resulting in uneven shrinkage, so cupping may indicate a higher moisture level in the ceiling space or a higher moisture level in the room

Repair

  • identify and address the cause of the high moisture levels in the roof space (see 'Roof space dampness') and the room
  • replace severely cupped boards, or replace ceiling if necessary

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