A construction defect is an error made during the design, calculation or execution of a building that leads to faults, damage or unsafe conditions. Construction defects range from cosmetic blemishes to serious structural problems.
Types of Construction Defects
Construction defects are classified by cause:
- Design defects — the architect or structural engineer makes an error in the design or calculations
- Workmanship defects — the contractor does not carry out the work in accordance with the specification or drawings
- Material defects — unsuitable or substandard materials are used
- Communication defects — unclear drawings or poor coordination between trades
Application
Construction defects unfortunately occur in many building projects:
- Damp problems — incorrectly installed damp-proof course or inadequate ventilation
- Cracking — due to missing movement joints or insufficient reinforcement
- Foundation problems — a foundation that is not deep enough or not strong enough
- Insulation defects — cold bridges caused by interrupted insulation
How to Prevent Construction Defects
- Thorough preparation — a complete specification and clear drawings
- Site supervision — have an independent clerk of works inspect the construction
- Certified contractors — work with reputable, qualified firms
- Snagging inspection — inspect the work thoroughly before handover
Related Terms
- Specification
- Structural integrity
- Handover
- Building regulations
- Latent defects
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