We have a basement below about one-third of the house and its usefulness
for storage is limited by damp, and resulting mould spores.
We've tried to combat this by using a de-humidifier but I suspect the net
result of this is to accelerate the rate at which water is vapourising
through the walls.
Would we have more success by installing one or more extractor fans to pull
air through? The floor area in question is about 45 square metres, split
between two rooms, with a ceiling height of about 2 metres. The remaining
space under the house is just crawl space, although fairly generous in
headroom. The house was built around 1910.

TIA,

Peter