Mortar
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Glass block cracking in mortar joints
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There is insufficient allowance for structural movement around the glass block panel
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Wall has inadequate strengthening to withstand the imposed structural loading
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The panel is not able to resist the imposed wind loading
Glass block leaking at joints
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Poor quality mortar
Glass block crumbling mortar
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Mortar dried too rapidly during installation
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Poor quality mortar
Glass block stains
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Alkaline run-off from cement mortar such as an external wall or where the glass block wall is part of a shower
Concrete or clay tiles – broken mortar under tiles
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Building movement (wind, earthquake)
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Poorly compacted mortar
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Inadequately fixed ridge, hip or verge tiles
Crumbling mortar in masonry chimneys
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Moisture getting into the mortar
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Mortar quality is poor – most commonly found in pre-1930s buildings
Insecure chimney pot
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Mortar deterioration between chimney and chimney pot
Open fireplace – crumbling chimney mortar
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Deterioration due to age
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Moisture ingress into the bricks
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 – 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
Cracks in the mortar and/or bricks
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No control joints incorporated in wall
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Differential settlement of the building caused by swelling/shrinking of clay soils and inadequate foundations and indicated by cracking through the mortar stepped across the face of the wall
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Building subjected to vibration movement such as earthquake, high wind
Concrete blockwork – cracks in the mortar and/or blocks
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No control joints incorporated in wall
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Differential settlement of the building caused by swelling/shrinking of clay soils and inadequate foundations and indicated by cracking through the mortar stepped across the face of the wall
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Building subjected to vibration movement such as earthquake, high wind
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Wall unreinforced
