Concrete tiles
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Tiled deck or patio – cracking
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Substrate shrinkage
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Thermal expansion/contraction
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The framing and/or substrate has too much deflection
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There are no or insufficient tile movement control joints
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Tiles were fixed over movement control joints
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The concrete substrate was not sufficiently cured before tiles were laid
Tiled deck or patio – loose tiles
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Incorrect adhesive used; poorly applied adhesive to tiles
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Substrate deflection
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Tiles may have been loose laid or supported on proprietary legs or supports
Concrete or clay tiles broken or cracked
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Wind or frost damage
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Careless walking on the roof
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The tiles are at the end of their serviceable life
Concrete or clay tiles are loose
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Poor initial installation; tiles not fixed in place
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Corrosion of tie wires or clips (visible in the roof space)
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Wind causing tiles to vibrate and loosening tie wires
Concrete or clay tiles – dislodged or missing
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Wind or earthquake damage
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Tiles not securely fixed in place during installation
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
Concrete or clay tiles – moss and lichen
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Insufficient cleaning, or roof remains damp due to overhanging branches
Concrete or clay tiles – lead flashing lifting
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Wind
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Lead flashing is of too light a grade
Concrete or clay tiles – roof sagging
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Rafters are inadequately sized for the span and weight of roofing
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Insufficient strutting support for the roof weight
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Roof framing has been damaged or cut
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Loadbearing walls below have been removed
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Rafters have been damaged by borer or decay
Loss of gloss to concrete tiles
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Weathering of the polymer film applied to the tiles during manufacture
Efflorescence on concrete tiles
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Natural salts within the tiles migrate to the surface leaving a whitish-grey residue
Concrete tiles – fading
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UV light
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Build-up of dirt on the tiles