Trying to put up a cabinet and some heavyish mirrors in a friends property. Stud walls , but my detector isnt picking up the studs. I tried to locate the plasterboard screws/nails with a strong magnet only to find that the magnet sticks to the entire wall. I decided to drill a test hole and the magnet wasnt lying I hit metal. I pushed a small screwdriver through and pushed against the metal, there is some bouce in it but is fairly rigid. Is this a mesh or is it something protecting the plastic radiator piping? Help please.