Fibre-cement shingles – efflorescence

A whitish substance has appeared on the shingles

Causes

Moisture absorbed by the shingle/shake brings salt-like deposits to the surface

Listed under: concrete and cement, fibre-cement, Roof, cladding, moisture, roof cladding, fibre-cement shingles

Cause

Moisture absorbed by the shingle/shake brings salt-like deposits to the surface

Repair

  • dry brush the deposits with a stiff bristle brush and wash down the surface. The roof may need to be cleaned more than once to fully remove efflorescence.
  • when working at height, always let someone know. Ensure the access ladder is in good condition and is securely set up on a solid level base. The correct angle for the ladder is 1 metre out from the wall for every 4 metres of height. 

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