As per NHBRC, the causes of defects, excluding misuse and abuse of the consumer which affect strength, stability, durability and serviceability will fall in the following categories:
- Undue ground movement caused by unavoidable situations such as standing water including heave, subsidence, settlement and slip
- Inadequate structure strength, not caused by an abnormal event resulting from under-design/inadequate specification, poor construction, overloading and indirectly applied loads resulting from the deflection, deformation or shortening if interconnected structured elements
- Normal structured movement which has not been catered for, including shrinkage and creep of materials such as concrete, thermal movements, movements due to moisture changes, deflection of structural components and moisture expansion of burnt clay masonry units.
- The use of materials which are unsuitable with the Home Building Manual or inappropriate in the circumstances in which they are being used.
- The effects of chemical agents resulting in the rusting and corrosion of steel and other metals or the deterioration and disintegration of other non-metallic materials such as concrete masonry units, mortar, timber etc
- The effects of vegetation whether direct or indirect.
- Abnormal events such as high winds, floods, snow, hail and lightning, seismic events, fire and explosions
- Failure to undertake necessary maintenance and repairs timeously.
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