What is Condensation Resistance?

CR measures the ability of a product to resist the formation of condensation on the interior surface of that product. The higher the rating, the better the window is at resisting condensation formation. The CR is expressed as a number between 0 and 100. Whilst this rating cannot predict condensation, it provides a method of comparing the potential of various window types.

Condensation management finally makes it into the NCC before humankind lands on Mars!


Windows are part of the solution

Condensation seen in the built environment is almost always a result of one or a combination of three circumstances:

(1) the presence of moisture levels which are too high;

(2) the presence of temperatures in the building fabric which are too low; and

(3) uncontrolled flow of water vapour from a source to a region of cold temperature (cold condensing surface).

The most familiar condensing surfaces in a building are windows.

Window frames and glazing can be cold impermeable surfaces, exposed to high levels of indoor humidity and where condensation is also clearly visible to occupants.

Condensation can be mitigated here by using TRIPLE glazing and THERMALLY BROKEN window frames to keep the surface temperature above indoor dew point. 

Seeing condensation on windows is a useful warning sign that more sinister and damaging condensation could be occurring unseen within the wall, roof and floor elements of the building. 

Very importantly, Triple Glazing Australia Condensation proof design eliminates mould.


Condensation and it’s impact on health and amenity is also a major point in the updated NCC on 1st May 2019 (National Construction Code).