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Rust stains on concrete/concrete block foundation walls

  • Poor quality concrete absorbing water that rusts the reinforcing, which in turns causes the concrete to spall or crack, allowing in more water 

    How to repair

  • The reinforcing was installed too close to the outer surface of the concrete

    How to repair

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Lightweight aerated concrete panels/blocks – chalking paint

  • Weathering, UV light exposure – chalking will be more visible with darker colours

    How to repair

Lightweight aerated concrete panels/blocks – fading paint

  • Weathering UV light exposure – darker colours are more prone to fading 

    How to repair

Lightweight aerated concrete – peeling or flaking paint

Lightweight aerated concrete – bubbling or blistering paint

Lightweight aerated concrete – paint failure at base of walls

Cavity brick or concrete block veneer – efflorescence

  • Moisture in the bricks causing salts to migrate to the surface leaving a whitish-grey residue

    How to repair

Cavity brick or concrete block veneer – crumbling mortar

Cavity brick or concrete block veneer – crumbling bricks

  • Ground moisture being absorbed by bricks and moving up the wall due to deteriorating or missing damp-proof membrane, or plaster or soil bridging the damp-proof membrane

    How to repair

  • Frost causing expansion of moisture in bricks

    How to repair

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Cavity brick or concrete block veneer – cracks in mortar

  • Differential settlement of the building caused by swelling/shrinking of clay soils, inadequate foundations or tree roots under the foundations, and indicated by cracks in the mortar stepped across the face of the wall

    How to repair

  • Soil load behind basement wall causing deformation

    How to repair

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Cavity brick or concrete block veneer – cracks in lintel

  • Corrosion of steel lintel bar supporting the bricks

    How to repair

  • Differential settlement of the building caused by swelling/shrinking of clay soils and inadequate foundations

    How to repair

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