Concrete wall – rust stains

Causes

Corroded reinforcing steel caused by moisture getting into the concrete as a result of poor quality concrete and/or the reinforcing being too close to the surface of the concrete

Listed under: Exterior, concrete and cement, metal, steel, stains, cladding, walls, durability, corrosion, rust, wall cladding, solid concrete wall

Cause

Corroded reinforcing steel caused by moisture getting into the concrete as a result of poor quality concrete and/or the reinforcing being too close to the surface of the concrete

Repair

  • for small areas of rusting (150–200 mm2 maximum), remove loose concrete and expose reinforcing to expose unrusted reinforcing; wire brush to remove loose rust; apply zinc-rich paint to reinforcing; fill hole with cement plaster or epoxy plaster
  • consult a chartered professional engineer for advice on repair options

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