Cavity brick or concrete block veneer
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Cavity brick or concrete block veneer – efflorescence
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Moisture in the bricks causing salts to migrate to the surface leaving a whitish-grey residue
Cavity brick or concrete block veneer – crumbling mortar
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Weathering
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Mortar quality is poor – most commonly found in pre-1930s buildings
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Use of lime mortar
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Foliage (creepers, vines) growing on building
Cavity brick or concrete block veneer – crumbling bricks
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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
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Frost causing expansion of moisture in bricks
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Foliage (creepers, vines) growing on building
Cavity brick or concrete block veneer – cracks in mortar
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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
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Soil load behind basement wall causing deformation
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Building subjected to vibration movement such as earthquake, high wind
Cavity brick or concrete block veneer – cracks in bricks
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Building movement as a result of differential settlement of the ground, earthquake, or some other cause
Cavity brick or concrete block veneer – cracks in lintel
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Corrosion of steel lintel bar supporting the bricks
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Differential settlement of the building caused by swelling/shrinking of clay soils and inadequate foundations
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Building subjected to vibration movement such as earthquake, high wind
Cavity brick/concrete block veneer – blocked ventilation slots
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Slots blocked by dirt, insects
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Slots sealed/blocked during previous maintenance work
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Ventilation slots not originally provided
Cavity brick/concrete block veneer – blocked/missing drainage slots
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Slots blocked by dirt, soil, foliage
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Slots sealed/blocked during previous maintenance work
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Ground level or paving built up to cover slots
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drainage slots not originally provided
Cavity brick/concrete block veneer – peeling or flaking paint
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Loss of adhesion due to excess moisture in substrate
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Poor initial substrate preparation
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Oil-based (alkyd) paint applied over water-based (acrylic) paint
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Surface was damp or dirty when painted previously
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Dark colours
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Paint coating at the end of its serviceable life
Cavity brick/concrete block veneer – bubbling or blistering paint
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Loss of adhesion due to excess moisture in substrate
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Poor initial substrate preparation
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Oil-based (alkyd) paint applied over water-based (latex) paint
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Surface was damp or dirty when painted previously
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Water-based paint coat exposed to moisture before paint has fully dried
Cavity brick/concrete block veneer – paint failure at base of walls
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Cladding covered by soil/foliage
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Concrete has been placed up to and against cladding
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High subfloor moisture levels behind the cladding
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Bottom of cladding too close to waterproof deck surface, apron flashing and absorbing moisture
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Drainage from veneer cavity blocked
Cavity brick/concrete block veneer – uneven colouring/staining
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Localised water run-off across the face of the wall
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Lack of rain washing
