Fix nail pops in plasterboard

Fix a popped plasterboard nail by re-fixing it properly, filling the dent and painting to match for a smooth wall.

NP-01Clear the area and inspect the popMove furniture away and lay a dust sheet below the repair. A nail pop looks like a small raised bump or crack in the paint, with the fixing head just under the surface. Wipe the area clean and knock off any loose paint flakes with your fingers so you can see the full extent of the bump.

1 each · Dust sheet

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NP-02Work out what's behind the plasterboardNail pops happen where plasterboard is fixed to timber studs, metal studs, or (less often) where an old screw at a joint has worked loose over dot-and-dab. Run a stud detector or a strong magnet across the wall to find the line of fixings either side of the pop. A dull, solid knock means you're over a stud or dab; a hollow knock means fresh air behind the board. Solid brick or block walls without a plasterboard skin don't get nail pops, so if you're on bare masonry this job doesn't apply.

1 each · Stud detector

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1 each · Magnet (small, strong)

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NP-03Confirm timber or metal stud with a pilot holeDrill a small 2mm pilot hole about 15mm to one side of the popped fixing, into where you think the stud is. Fine, pale dust means timber. Grey metal filings (swarf) mean a metal stud, common in flats, new builds, and anything refitted since the 1990s. Metal studs also give a lighter, thinner-sounding knock than timber.

1 each · Drill bit, 2mm

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NP-04Check for cables and pipes before you drillCables and pipes can run almost anywhere behind a wall, not just in the usual zones. Use your detector, but still assume something could be there even if it shows nothing — detectors miss deep cables, cables in metal conduit, anything behind metal-backed plasterboard, and metal studs confuse cheap detectors further. Find your stopcock now (usually under the kitchen sink) and check it turns freely, so you can shut the water off fast if you hit a pipe. If you have any doubt at all, turn off the relevant circuit at the consumer unit before drilling.

NP-05Deal with the popped fixingDrive the popped nail or screw back in slightly below the surface using a hammer and nail punch, or a screwdriver — don't pull it out, as it's still holding the board. On lath and plaster, be gentle: old laths are brittle, and forcing a nail can crack the plaster further. If the fixing spins freely and won't tighten, leave it and move to the next step; you'll add new fixings alongside it.

1 each · Nail punch

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NP-06Add a new fixing on each side of the popTimber stud: drive a 38mm drywall screw into the centre of the stud, about 40mm above and below the popped fixing. Metal stud: use a self-drilling metal-stud screw or a toggle-type hollow-wall anchor rated for plasterboard — never a plain plastic wall plug or an ordinary wood screw, as it will strip straight through 0.5mm steel. Dot-and-dab: if the pop is over a dab, a plasterboard fixing that reaches the masonry behind (typically 60-75mm long) gives a firmer repair than fixing into the board alone. Lath and plaster: if the laths feel soft or crumbly around the pop, don't force a new fixing in — skip to filling instead, or get a plasterer to check the ceiling or wall.

1 box · Drywall screws, 38mm (box of 100)

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1 pack · Metal-stud self-drilling screws, 25mm (pack of 10)

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1 pack · Hollow-wall toggle fixings (pack of 4)

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4 each · Plasterboard fixing, 75mm (for dot-and-dab)

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NP-07Fill the dentApply a light coat of ready-mixed filler over the whole repair with a filling knife, pressing it flat and feathering the edges so there's no ridge. Leave it slightly proud, as most fillers shrink a little as they dry. Let it dry fully — check the tub, but usually 1-2 hours for a thin coat.

1 tub · Ready-mixed multi-purpose filler, 500g

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1 each · Filling knife, 100mm

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NP-08Sand smoothOnce fully dry, sand the filled area with fine sandpaper wrapped round a sanding block, using light circular strokes. Feel with your fingers as well as looking — a repair can look flat but still have a slight edge. Wipe away dust with a slightly damp cloth before painting.

1 sheet · Fine sandpaper, 180 grit

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1 each · Sanding block

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NP-09Prime and paint to matchFiller is porous and will show through paint if left bare, so apply a coat of matt emulsion or a dedicated filler primer over the repair first. Once dry, paint over the whole wall or ceiling panel with your matching finish coat, feathering out from the repair so the sheen blends in.

1 pot · Matt emulsion or filler primer, small tester pot

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1 each · Paintbrush, 25mm

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NP-10Tidy upFold in the dust sheet to trap dust and debris, then wipe down skirting and floor nearby. Rinse tools and brushes and leave the filler tub lid on tight so it doesn't dry out for next time. Put furniture back once the paint is fully dry.

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