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I've bought this house that was previously owned by a (deceased) builder. He built a new garage and converted the old one into an office and shed. I want to convert the ofice into a workshop. It is lined with plasterboard and I'm trying to get a strong fixing onto it. I've probed the plasterboard and the surface is around 50mm from the brick behind, so I initially thought it was a stud wall. I can't find any studs. I tried a metal detector, but that indicates the whole wall is metal (foil?). I tried a stud detector, but that fails too, perhaps because of the metal. I've tried a magnet - nothing. I'm beginning to wonder if there's something like celotex bonded to the brick, with the plasterboard bonded to that. How can I get a secure fixing without crushing the plasterboard and whatever's under it?
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