Delignification is frighteningly common in Sydney’s inner city and coastal regions. This image was taken during a building and pest inspection in Sydney’s Inner West. The roof interior revealed chemical delignifiaction of roof tile battens to the whole roof frame.
Sometimes called Defibrosis or Hairy Timber, Delignification is the chemical break down of the lignin (glue) in the timber, caused by airborne chemicals. This can be a major safety hazard. Roof tiles can collapse under load eg someone walking on roof or during strong winds. Repair of delignification can be difficult and expensive.