NAT: What relative humidity level is best to prevent mould growth in a strata apartment?

Question: I have a dehumidifier. To prevent mould growth, what relative humidity level should I be trying to get down to?

Answer: If you can get down to around about 45% – 50% relative humidity, that’s the ideal moisture content in the air.

Mould grows in a perfect environment. You need to reduce the relative humidity. If you can get down to around about 45% – 50% relative humidity, that’s the ideal moisture content in the air. A lot of people don’t have a device to accurately monitor the relative humidity. Restorers normally carry it, along with thermal imaging cameras.

Anything above 65% creates an environment that is able to grow mould. Don’t go too dry. If you go below 45% relative humidity, you start to get an itchy throat and it’ll dry out the air probably a little bit too much. Aim for about 45% to 50% and you shouldn’t have a problem.

Ryan Richards
Sedgwick
E: Ryan.Richards@au.sedgwick.com
P: 1300 735 720