Put up a heavy-duty floating shelf with hidden rods on a dot-and-dab plasterboard wall

Fit a heavy-duty floating shelf with concealed rods safely, choosing the right fixing for whatever wall or ceiling you actually have.

FS-01Plan the job and gather your toolsCheck the shelf kit's maximum load rating and make sure it suits what you'll put on it. Clear the area below the wall and lay a dust sheet down. Get a stud detector, spirit level, tape measure, pencil, drill, and a mix of masonry and wood drill bits, since you won't know your exact fixings until you've checked the wall in the next step.

1 each · Dust sheet

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1 each · Stud/cable detector

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1 each · Spirit level (600mm)

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FS-02Work out what your wall is actually made ofRun the detector along the height where you'll drill, tracking any line of screw heads for studs. Tap the wall: a dull thud means solid masonry or a stud, a hollow sound between two solid points means plasterboard on studs or dot-and-dab. Drill a 3mm test hole: fine white dust and a hard stop is brick or block; timber dust means a stud; grey metal swarf means a metal stud; and if the drill goes through plasterboard, hits nothing for 20-40mm, then hits something solid, that's dot-and-dab. Lath and plaster feels slightly springy and often has faint horizontal ridges under the paint.

FS-03Check for cables and pipes, and know your isolation pointsRun your detector over the whole drilling area, but don't trust it completely: cables can run outside the usual safe zones, and metal studs or metal-backed board can confuse cheap detectors. Find your stopcock now, usually under the kitchen sink, and check it turns before you start. If you have any doubt at all, isolate the relevant circuit at the consumer unit before drilling, and be ready to shut off the water at the stopcock if you hit a pipe.

FS-04Mark the shelf and rod hole positionsHold the shelf or its template against the wall at the height you want and mark the top edge with a pencil, checking it's level. Mark the exact centre of each rod hole from the kit's spacing, usually two rods per shelf. Use the spirit level again on the rod marks themselves, not just the shelf edge, since a small tilt here throws the whole shelf off.

1 each · Pencil

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1 each · Tape measure (5m)

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FS-05Choose the right fixing for your wall typeSolid brick or block: drill a 10mm hole at least 60-70mm deep and use a heavy-duty sleeve or resin anchor rated for the shelf's load. Dot-and-dab: the rods must reach through the plasterboard and the 20-40mm dab gap into the solid masonry behind, so use a long resin or sleeve anchor, typically 150mm, and confirm the gap depth with a long thin drill bit first. Timber stud: fixings must land in the centre of a real timber stud; if none lines up, fit a timber noggin between two studs first, screwed in with 75mm screws, then fix into that. Metal stud: a metal stud alone will not carry this weight, so screw a plywood pattress to the studs with self-drilling metal-stud screws, then fix the rods into the pattress; never use a plasterboard toggle or an ordinary wood screw here. Lath and plaster: find solid timber behind the laths using the same detector method, drill a pilot hole first to stop the brittle plaster cracking, and fit a pattress across at least two studs or joists if nothing lines up directly.

1 pack · Resin sleeve anchor M10 x 150mm (pack of 4)

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1 each · Timber noggin (50x50mm, cut to length)

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1 each · Plywood pattress (18mm, 300x100mm)

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1 pack · Self-drilling metal-stud screws (pack of 20)

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1 pack · Coach screws 75mm (pack of 4)

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FS-06Drill the rod holesFit the correct bit for your wall type and wrap a piece of tape around it to mark the exact depth. Drill slowly and check with the spirit level that you're going in straight, not on an angle. If you hit a cable or pipe, stop immediately, isolate at the consumer unit or stopcock, and reassess before continuing.

1 each · Masonry drill bit 10mm

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1 each · Wood drill bit 6mm

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FS-07Fit the anchors or pattressFor masonry or dot-and-dab, tap or wind the anchor in fully so it sits flush with the wall. For a stud or metal-stud pattress, screw the plywood or noggin in tight against the frame, checking it doesn't bow or twist as you tighten. Give everything a firm tug by hand before moving on.

FS-08Insert and secure the hidden rodsPush or screw each rod into its fixing until it's fully seated and tight. Check both rods are level and stick out from the wall by the same amount, adjusting before the fixing sets if you're using resin.

FS-09Slide the shelf onto the rodsLine the shelf's hidden channels up with the rods and push it firmly onto the wall. Check it's level and sitting flush, then apply any construction adhesive the kit specifies into the channels for extra grip. Wipe off any excess adhesive straight away.

1 tube · Construction adhesive

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FS-10Load test before you use it properlyLeave any adhesive to cure for the time stated on the tube, usually 24 hours, before loading the shelf fully. Add weight gradually up to its rated capacity, checking for any movement or creaking at the wall each time.

FS-11Clean upVacuum up plaster and masonry dust from the floor and skirting. Wipe the wall down and check the area around the shelf is clear of tools. Store any spare fixings in a labelled bag for future reference.

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