Introduction to Digital Moisture Mapping

Before you take a single reading, get a plan on paper or on screen. It does not matter whether you sketch it freehand, photograph the builder's plans the owner digs out of a drawer, or generate it with a laser measure and import it into your mapping software. What matters is that every room, corridor, cupboard, and adjacent space that moisture could have reached is on that plan, and that the scale is consistent across the whole thing. A plan with inconsistent scale will make your moisture map lie to you. Two reading points that look 300 mm apart on the map might actually be three metres apart on the floor, and that kills any meaningful interpretation of how moisture is moving through the structure. Number every reading location on the plan before you start collecting data. Not after. Before. Once you are moving through a wet house with a meter in one hand and a tablet in the other, you do not want to be making up location numbers on the fly.

The grid density you use depends on where you are in the building. In the core affected area, one reading per square metre. In the peripheral zones where moisture may have migrated but is less obvious, one reading per two square metres. In rooms that appear unaffected, take at least one reference reading per room or section. Those reference readings matter more than people think. Without them you have nothing to compare your wet readings against, and an assessor or loss adjuster will ask. For walls, work to three consistent heights: 150 mm from the floor to catch water that has wicked up from the base, 600 mm for the mid-wall zone, and 1200 mm for the upper wall. Record which height you used at each station, and use the same heights every time you return to monitor. If you drop to 100 mm on day one and 200 mm on day three because you were in a hurry, your trend data is worthless.

Every reading that goes into the system needs a full set of fields: location number matching the plan, date and time, material type, meter type and model, the specific setting you used on that meter, the temperature at the time of reading, and the moisture content value. Miss any one of those fields and the reading cannot be properly interpreted or defended later. This matters when a claim is disputed. Picture yourself on the phone with an assessor who says, "Your day-five readings show a spike in the subfloor, but there is no material type recorded and no meter setting. How do I know what I'm looking at?" You do not want to be in that position. Fill every field, every time, for every reading.

For data entry, get it into the system while you are still on site. Direct entry on a tablet or phone is the preferred method because it removes the transcription step entirely. Voice-to-text works if you review each entry before saving, but it will occasionally turn "carpet underlay" into something useless, so check it. If you are using paper field sheets and batching the entry later, that batch entry must happen the same day, not the next morning when the job has blurred together with whatever else came in overnight. Transposition errors from paper to screen are a real problem, and a reading entered as 18.4 instead of 81.4 can send a drying decision in completely the wrong direction.