Fit batten-supported alcove shelves to a lath and plaster wall — HomeGraft

Fit level support battens into an alcove, matching fixings to your wall, then cut and drop in a shelf.

AB-01Measure the alcove and mark shelf heightsAlcoves are rarely square, so measure the width at the top, middle and bottom, and the depth at both sides. Decide how many shelves you want and mark a level line for each one using a spirit level, not by eye. Mark the line on the back wall and carry it round onto both side walls (the reveals) so all three battens sit at the same height.

1 each · Tape measure

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1 each · Spirit level (600mm)

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1 each · Pencil

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AB-02Work out what each alcove wall is made ofThe back wall and the two side reveals can be different constructions, so check each one separately. Tap the wall: a dull, solid sound is brick or block; a hollow, papery sound is plasterboard, either on studs or dot-and-dab. For lath and plaster, the surface feels slightly springy and taps with a hollow, uneven sound because it's thin plaster on wood laths, not a solid wall. If you find a stud wall, run a detector or magnet along the line and follow the line of screw or nail heads to find the studs, then drill a small pilot hole: timber dust means a timber stud, fine grey swarf means a metal stud. Metal studs are common in flats and anything built or refitted from the 1990s onwards.

1 each · Stud and cable detector

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AB-03Check for cables and pipes, and know how to shut things offCables and pipes can run almost anywhere, and detectors miss cables that are deep, in metal conduit, behind metal-backed plasterboard, or outside the usual safe zones — a metal stud frame confuses cheap detectors even more. Before you drill, find your stopcock (usually under the kitchen sink) and check it turns freely, so you can shut off the water fast if you hit a pipe. If you have any doubt at all, isolate the relevant circuit at the consumer unit before drilling near it, and turn the water off at the stopcock before cutting into anything that could carry a pipe.

AB-04Cut the battens to lengthUse 34x18mm PSE timber batten. Cut one length for the back wall and two shorter lengths for the side reveals, each about 5mm short of the true measurement so they don't bind. Check each cut end is square before fixing.

2 each · 34x18mm PSE timber batten (2.4m length)

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1 each · Panel saw or mitre saw

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AB-05Fix the back batten — method depends on the wallHold the batten on your marked line and fix through it into the wall behind. On solid brick or block, drill a 6mm hole 40mm deep with a masonry bit, fit a red wall plug, and drive a 60mm masonry screw at every stud-width or 400mm along the batten. On plasterboard over timber studs, drive a 45mm wood screw straight into the centre of each stud you marked in step AB-02 — no plug needed. On plasterboard over metal studs, use self-drilling metal stud fixings or a toggle-type hollow-wall anchor rated for the load; never use a plain wall plug or an ordinary wood screw, as it strips straight through 0.5mm steel. On dot-and-dab plasterboard, use a long fixing (75-90mm) that passes through the plasterboard and the adhesive dabs to grip the solid masonry behind, not just the plasterboard. On lath and plaster, find the timber stud behind the laths first, then use a 50-60mm wood screw driven slowly to avoid cracking the old plaster; a plaster washer under the screw head spreads the load and stops the plaster crumbling.

1 pack · Red wall plugs (pack of 20)

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1 pack · Masonry screws 60mm (pack of 10)

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1 pack · Wood screws 45mm (pack of 20)

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1 pack · Self-drilling metal stud fixings (pack of 10)

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1 pack · Toggle-type hollow-wall anchors (pack of 4)

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1 pack · Long frame fixings 75mm for dot-and-dab (pack of 10)

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1 pack · Plaster washers (pack of 10)

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AB-06Fix the two side battensCheck each reveal separately for its own wall type before fixing — it's common for the reveals to be built differently from the back wall. Use the matching fixing from step AB-05 for whatever you find. Make sure each side batten lines up exactly with the back batten using your level line, not by sight.

AB-07Check the three battens sit level and in the same planeLay the spirit level across all three battens from side to side and front to back. Pack out any low spots with thin card or plastic packers before the shelf goes on, so the finished shelf doesn't rock or slope.

1 pack · Plastic packers

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AB-08Cut the shelf board to fitUse 18mm MDF or plywood for stiffness over the span. Measure the alcove width at the front and back of the shelf position, as it may differ, and cut the board to the narrower measurement so it doesn't jam. Sand the cut edge smooth.

1 each · 18mm MDF or plywood board (cut to size)

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1 each · Sandpaper (120 grit)

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AB-09Fit the shelf onto the battensDrop the shelf onto the three battens and check it sits flush and level all round. Screw down through the shelf into the battens from above using 30mm screws, spaced roughly every 300mm, so the shelf can't be lifted off accidentally.

1 pack · Wood screws 30mm (pack of 20)

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AB-10Fill, sand and finishFill any screw holes and gaps between the shelf edge and the wall with decorator's caulk or wood filler. Sand smooth once dry, then prime and paint or varnish the shelf and battens to match the room.

1 tube · Decorator's caulk

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1 each · Quick-dry primer (small tin)

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AB-11Tidy upVacuum up dust and off-cuts, especially any plaster dust from lath and plaster or metal swarf from stud fixings. Wipe down the shelf and check all fixings are tight before loading it with anything.

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