08/07/2019
Mould, Houses and Occupants.
This is a short version of an article posted in the NEWS section in our website.
Building inspectors are often alerted to hidden leaks not only by dampness or staining, but also through excessive mould growth in an area.
However, in most circumstances mould growth in New Zealand homes is due to house construction and occupant behaviour.
Most mould found on surfaces in NZ homes is of a common type such as Cladosporium, and although is black-looking, it is often not the infamous Stachybotrys chartarum – known as toxic black mould – which tends most often to form in cavities with more specific environmental constraints.
Any visible mould found should be removed immediately, and the cause assessed to provide good air-quality and decrease damage to surfaces. General preparedness and maintenance is as important as occupant intervention in mould reduction, below are some obvious steps to take
1. Preparedness
a. Adequate Insulation and vapour barriers where needed
b. Mechanical ventilation in bathrooms and kitchens
c. Install a shower dome
d. Windows which can be opened to ventilate in all rooms
e. Deal with water leaks straight away
2. Occupant intervention
a. Dry condensation off windows in mornings with a towel
b. Open doors and windows for at least 15 – 20 minutes even on cold days
c. Ventilate room (open window or leave extractor running) after using shower/bath
d. If possible, keep indoor temperatures at or above 18°C.