Monitoring moisture condition case studies

Figure 1: The bath is being filled. On the window sill is a data logger, fitted with electronic thermo-hygrometer to pick up room air relative humidity and temperature. From the logger a wire extends upwards where a surface thermometer is taped to the ceiling

Figure 2: Taking off a taped sensor from a wallpaper or lining is probably one of the most potentially damaging acts in moisture monitoring: papers and paints can so easily be ripped by the tape, more damage than a drilled hole

Figure 3: The graphed results downloaded from the laptop show that as the bath filled, the room air became progressively more humid, rising from around 40% to 90%. Dew point had risen too, from 6.3°C just before bath filling, to 18°C. The ceiling surface temperature was below dew point from 11.57am, so condensation would be forming even if it could not be seen or touched. The laws of physics cannot be denied. Note the graph of surface temperature (yellow) below dew point - where blue dew point graph rises above ceiling surface temperature (T1)