We’ve all had to endure the endless drip, drip, drip of a water leak somewhere in our house or appartment. When it’s a tap, it drives you nuts, but at least you can see it and do something about it. The real problem is when the leakage is behind a wall, or under a floor. Water infiltrates and then rots the structures. This can end up costing a lot to repair, and can even undermine the most solid of buildings.