NB-03Find the timber studs behind the lath and plasterLath and plaster walls are timber-framed: thin wooden laths are nailed horizontally across vertical studs, then covered in a lime plaster keyed through the gaps between them. You won't find metal stud framework behind lath and plaster - it's an older method that predates metal stud partitions, so timber is what you're always looking for. Run a stud detector or magnet along the wall at your marked height, tapping as you go; a dull, hollow knock means you're between studs, a solid knock with almost no give means you've found one, and studs usually sit at 400-600mm centres. If you're still not sure, drill a small 2-3mm pilot hole - timber dust confirms a stud or lath, while an empty, slightly loose hole means you're in a plaster-only gap.