Relative Humidity

[Triassic]

I’ve just started to look at the relative humidity in the new house. What sort of RH would you expect to achieve as the house dries out.

[Iceverge]

It depends on the temperature. 

 

From memory i think the most i saw was about 85% at 14 deg. That was a bit of an experiment though, the house was airtight and i closed all the windows overnight. 

 

If i had heated the same air to 20 degrees the relative humidity would probably have dropped to about 60% while the absolute humidity g/m3 water vapour would have stayed the same. 

 

When i opened all the windows and let air at 8 deg and 90% RH in the relative humidity dropped to about 65% once that air warmed up to 14 deg.