Household Mould

When people talk of black mould they are usually refering to Stachybotrys chartarum, which is often the source of those dark black or green patches of mould that we see on walls.  S. chartarum is capable of producing myctoxins, including satratoxins which can cause bleeding of the lungs. As serious as this sounds, the major link we see is a more general one between damp homes and negative health effects. High levels of mould regardless of species should be a concern.

As with many things, prevention is the best cure and you can prevent mould growth by preventing dampness. Moisture is critical. While mould spores will always be present in your home, their growth can be reduced by working to reduce the level of dampness in your house. 

Activities such as cooking, showering, and drying clothes inside can release moisture into the air and increase the dampness in your house. Keeping lids on pots, opening windows, making use of extractor fans, and wiping down wet surfaces can all help.

Ongoing sources of damp, such as leaky piping or guttering, can also create conditions ripe for mould growth. Such leaks should be identified and fixed.

When the weather is fine, take the opportunity to open up your house and air it out. Good airflow will help to keep your home dry.

• Visible mould and mildew on walls and shower curtains can be removed with a fungicide such as dilute household bleach. If you choose to use such fungicides, ensure good ventilation during and after cleaning.

• MPI has a page dedicated to the cleanup of mould: https://www.worksafe.govt.nz/topic-and-industry/natural-events-and-emergencies/preventing-and-cleaning-up-mould-after-a-natural-event-or-emergency/

• Professional services are also available.