Air Quality

Mould and mildew are a major problem in warm, humid climates such as the East coast of Australia where as many as 70% of all homes eventually suffer from mould and/or mildew issues. Mildew is a mould that grows under warm, humid conditions. Optimal growth conditions are from 25° to 30° C, and between 60% and 90% relative humidity. Indoor mould and mildew increases the risk of occupant sickness and can cause expensive and frequent repairs and redecorating.

The affects of the ambient environment

Ambient air contains mould and mildew spores, as well as other air quality problems such as bacteria, pollen, dust, etc. In addition, air leakage through structures carries moisture vapor with it, which condenses on colder surfaces. This condensation causes wood to decay and contributes to the creation of micro-environments suitable for the development of mould and mildew.

In older buildings, uncontrolled air leakage can be responsible for 50% to 60% of the heating and cooling energy consumption, and large capacity heating and air-conditioning equipment is required. During times when even small temperature differences exist between inside and outside and/or no wind is blowing, leaky buildings still experience underventilated conditions.