Polystyrene blocks
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Polystyrene block – chalking paint
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Weathering, UV light exposure – chalking will be more visible with darker colours
Polystyrene block – fading paint
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Weathering UV light exposure – darker colours are more prone to fading
Polystyrene block – 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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Dark colours increasing surface temperatures
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Water-based paint coat exposed to moisture before paint has fully dried
Polystyrene block – uneven colouring/staining across wall
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Localised water run-off across the face of the wall
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Lack of rain washing
Polystyrene block – sealant failure in panel joints
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UV exposure
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Sealant not suitable for being painted
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Too much movement for the grade of sealant
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Sealant not installed over a backing rod or bond breaker tape
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Sealant at end of serviceable life
Polystyrene block – plaster finish taken below ground level
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Installed with no capillary break that may allow water to be drawn up through the plaster finish
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Gardens have been built up
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Path or paving laid against the cladding
Polystyrene block – cracks in the cladding systems
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Paint or sealant failure
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No cap or saddle flashings at junctions of parapet and balcony walls
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Junctions with other claddings and/or roof poorly detailed/constructed
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Minimal jamb flange cover of aluminium windows