Heated Floors: Do not damage the mat

Make sure not to damage the blue wire. We hooked up an multimeter across the two wires. We monitored the resistance all the time. We kept our fingers crossed till the last tile was placed. If we broke the wire it will show very high or infinite reading. It will be zero if we shorted the two wires. Tile laying contractor had to be told repeatedly not to damage wire. In the end it worked out to be well. He was excited too as he has never seen it before.