Solid stone and stone veneer
Showing results 1-8 of 8
Stone veneer – blocked or missing ventilation slots (top of wall)
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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
Stone veneer – blocked or missing drainage slots (bottom of wall)
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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
Stone veneer – cracks in the lintel
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Corrosion of steel lintel bar supporting the stone
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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
Stone 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
Stone veneer – surface damage or deterioration
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Air-borne pollution, dust or dirt combined with rain causing acid attack on the stone – particularly susceptible are limestone such as Oamaru stone
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Oxidation of impurities in the stone
Solid stone – 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
Solid stone – rising damp or damp in walls
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Ground moisture being absorbed by stone 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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No damp-proof membrane at base of the wall
Solid stone – surface damage or deterioration
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Air-borne pollution, dust or dirt combined with rain causing acid attack on the stone – particularly susceptible are limestone and Oamaru stone
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Oxidation of impurities in the stone
