Moisture mapping gauges the thermalisation (slowing down) of emitted neutrons to detect hydrogen and therefore moisture content to a depth of 300mm and diameter of 250mm from the gauge base. 

Roofing materials also contain hydrogen, and so a background reading is established by analysing core samples taken from varying gauge reading locations (low-high) to determine how much of the thermalisation is due to trapped moisture.

Measurements are generally performed in a 2-metre grid pattern, plotted on a scaled drawing of the roof. Once readings have been taken, a histogram is created to help determine which values represent dry and wet areas.

Moisture mapping is suited for all roof structures, particularly those with multiple layers of insulation and previous waterproofing systems. The gauge will also detect moisture within certain decks or supporting structure in uninsulated roof situations.

Measurements are generally performed in a 2-metre grid pattern, plotted on a scaled drawing of the roof. Once readings have been taken, a histogram is created to help determine which values represent dry and wet areas.

Moisture mapping is suited for all roof structures, particularly those with multiple layers of insulation and previous waterproofing systems. The gauge will also detect moisture within certain decks or supporting structure in uninsulated roof situations.