Monitor dampness. Monitor dampness with simple damp meter, logging at the same time and position every week.
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Monitor relative humidity
Monitor sub-floor humidity with a hygrometer probe (eBay.co.uk £5 Digital LCD Thermometer Hygrometer with Probe Temperature Humidity Gauge) under damp wall. A probe can be pushed through cracks in floorboards or by discretely drilling out a hole. The sub-f