The Mdu Probe
Accurate Moisture Readings with no damage
 
The Mdu Probe is the basis of the Mdu System. Mdu Probes allow moisture measurements to be taken deep within building walls to get the most accurate non-destructive moisture readings available. This new technology surpasses previously known methods. The Mdu Probe fulfills the need for greater accuracy without damage.
 
 
Non-destructive
 No damage is caused to the building at installation
Accurate
 Calibrated industry-standard Protimeters are used to measure readings
Relevant
 Probes measure timber MC within 10-20mm of the exterior cladding.
Reliable
 Mdu Probe measurements use industry-standard measuring equipment
Repeatable
 Measurements can be taken as often as desired
Quantitative Data
Resistance measurement allows actual MC figures to be reported
 

For general house moisture assessment, Mdu Probes are installed in the bottom plate of timber-framed walls. The length of the probe ensures that readings are taken approximately 10-20mm away from the wall exterior cladding.

 

Probes are inserted into the bottom plate because moisture travels down and towards the cladding. High moisture levels are normally found directly below a leak, or where ground moisture is wicking up. Leaks often form what is termed 'the Xmas Tree Effect', spreading the leak down towards the bottom plate.
 

Readings are taken as close as practical to the cladding as research has shown that this section of the bottom plate typically holds higher moisture levels (see orange and red sector in picture to above) in comparison with the rest of the bottom plate. Rot develops in this area first, so measuring the moisture here gives the homeowner the earliest possible warning of this.

Extensive research has been carried out on the microclimate conditions (temperature, relative humidity, vapour pressure) of air around the bottom plate of a number of claddings.

 
Technical paper by Ken and Bryan Holyoake (pdf)
 
   
Installation
 
 
 
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