SW-05Fix the top track — method depends on your wall or ceilingThe top track carries the full weight of both doors, so this fixing matters most. Solid brick or block: drill 6mm-8mm holes to the depth stated on the plug packet, insert wall plugs, and drive in the supplied screws. Plasterboard on timber studs: drive a wood screw into the centre of each stud along the line; if a fixing point falls between studs, add a short timber noggin behind the board first, screwed to the studs either side. Plasterboard on metal studs: never use a plain plastic plug or a wood screw, as they strip straight through 0.5mm steel; use self-drilling metal-stud fixings, but because a sliding door track is heavy and constantly loaded, fit a timber noggin between the studs wherever possible and screw into that instead. Dot-and-dab plasterboard: use fixings long enough to pass through the board and dab layer into the solid masonry behind, typically 60-75mm, with a wall plug in the masonry. Lath and plaster: locate the timber studs behind the laths with your pilot holes and screw into solid timber, not just the old lime plaster, which will crumble under load.