Relative Humidity

[thepony]

I have bought a portable dehumidifier for the garage of my M3 CS and was wondering what is the optimal relative humidity for storing in a garage :-) ?

The dial on the humidifier ranges from 80% relative humidity to 35% relative humidity (much drier air)

Thanks very much :-)

[Boogsie]

Can't go wrong at 50%.
Not too dry so that everything dries out.
Not too moist. Not sure why too moist would be a problem though.

I'm speaking with absolutely no knowledge of the humidity of where a car should be kept
I do know that libraries are at 50% though.

[TheEnd]

As dry as possible, I'd have thought, as in "de-humidified garage"

[t8cmf]

Here you go

THE TARGET ENVIRONMENT
The aim is to arrive at a stable environment between 40% and 60% RH independent of outside temperature. Below 60% bare metal can be left out in the open and rust/corrosion all but stops. Below 40% RH leather and wood can dry too much and will become brittle and crack.

http://www.dry-it-out.com/car-storage-faq

[V8A*ndy]

Boogsie said:

Can't go wrong at 50%.
Not too dry so that everything dries out.
Not too moist. Not sure why too moist would be a problem though.

I'm speaking with absolutely no knowledge of the humidity of where a car should be kept
I do know that libraries are at 50% though.

Your not far wrong. Relative humidity and temp also come into play with the dew point were condensation may form.

One thing I would mention is that the humidistats on the dehumidifiers are not very accurate.

Edited by V8A*ndy on Friday 16th November 18:28

[thepony]

Thank you very much for everyone's responses ....

Set the dehumidifier RH to 50% .... Below 60% prevents bare metal corrosion .... Below 40% leather begins to crack .... :-)