Mould assessments

Understanding mould contamination in New Zealand buildings

Mould and bacteria can negatively affect indoor environments and create a range of health concerns. Depending on the species and level of contamination, exposure may lead to allergic reactions, respiratory irritation, asthma flare ups, skin problems or in some cases more serious infections. Certain moulds can produce mycotoxins, and many mould and bacterial spores contain allergens that can trigger symptoms in sensitive individuals. Health effects vary based on the type of organism present, how much growth is occurring, the method of exposure and each person’s susceptibility.

Indoor mould growth is closely linked to excess moisture. Leaks, poor ventilation, condensation and inadequate drainage are common causes in New Zealand homes and commercial buildings. Once moisture is present, mould can spread quickly, including into concealed areas such as wall cavities, under flooring, behind linings or within insulation. Even mould that cannot be seen may still release spores and compromise indoor air quality.

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Our mould assessment services

ALS provides a full range of mould investigation services throughout New Zealand. Our assessments are designed to support homeowners, landlords, insurers, property managers and commercial clients.

Inspections and sampling:

Visual inspections to document visible mould, water damage and areas with elevated risk
Moisture evaluations using moisture meters and thermal imaging to pinpoint hidden dampness
Air and surface sampling for accredited laboratory analysis to identify species present and quantify contamination.

Remedial action plans:

Investigation of underlying causes, including leaks, building defects, drainage issues or ventilation limitations
Development of clear and practical remediation plans that align with recognised guidance and industry practices
Recommendations for moisture control, ventilation improvements and safe cleaning or removal techniques.

Post-remediation validation:

Verification inspections after remediation work are completed
Air or surface sampling to confirm mould has been successfully removed and environmental conditions are suitable for re-occupation
Reporting that provides evidence of successful remediation for clients or insurers.