Keep the space dry! The drier the climate, the less risk there is of mould or dry-rot.
It is best not to install an exhaust fan in the loft, as this can create negative pressure and draw up damp internal air from the living area to the attic.
If you decide to install a dehumidifier, you must make sure that you seal the loft, so that no outdoor air leaks in.
The dehumidifier should also be fitted with a humidistat. The humidistat starts the dehumidifier when the humidity gets too high, and turns it off when the humidity has dropped to an acceptable level. This saves energy.
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