Wall Shelves for a Drawing Room With Lath and Plaster Walls

Yes: the studs behind the lath, and almost nothing else. In a lath and plaster wall the plaster face is a finish, not a structure, so wall shelves for a drawing room in a period house are a timber-finding job first and an anchor job second. The useful part is that the lath itself tells you where the timber runs.

That saucer-sized crater was not bad luck either. A wood-lath wall carries a minimum of roughly 3/4 to 7/8 in of brittle plaster in front of the framing, and a bit that pushes instead of cutting takes a lump of it with the hole. Houseland rates its five-piece pine set at up to 11 lb (5 kg) per piece, so the load you are asking that wall for is small enough that one honest fixing per piece is a realistic target rather than a fantasy.

What actually holds a lath and plaster wall together?

The keys hold it. A plasterer pressed wet plaster through the gaps between the lath strips so it slumped down the back of them and set there, and the National Park Service's Preservation Brief 21 on flat plaster says outright that those keys are what hold the plaster in place. Everything in front of them is a coating. On a three-coat job the finish layer is about 1/8 in thick over scratch and brown coats of roughly 3/8 in each.

That has consequences for a shelf. The plaster face has no tensile strength worth borrowing, and the lath behind it is thin softwood, described by the standard description of the assembly as strips about 1 in wide and 1/4 in thick, set roughly 3/8 in apart. When a key breaks, the Brief notes, the plaster goes loose or bowed.

Minimum plaster thickness is about 3/4 to 7/8 in over wood lath, against 5/8 in over metal lath and 1/2 in over rock lath, so an old wall puts nearly twice as much brittle material between your bit and the framing as a modern one does.

How do you find a stud behind lath and plaster?

Follow the nails, because the lath was nailed to the studs. Brief 21 records that wooden lath was fixed at right angles directly to the joists and studs, which turns every course into a marker for the timber underneath.

1. Drag a strong magnet across the wall at chest height, slowly, keeping contact. Nail heads register as a faint tug.
2. Mark every hit. A 1 in lath with a 3/8 in gap puts a course roughly every 1-3/8 in of height, so a stud shows up as a vertical column of marks, not a single one.
3. Join two marks with a pencil line and check it against a spirit level. A column that is not plumb is a run of loose lath nails, not framing.
4. Hunt sideways for the next column and then measure the gap between the two, rather than trusting a spacing you read somewhere.
5. Watch for battens. The same Brief notes lath was sometimes fastened to non-structural furring strips instead of to the frame, so a tidy nail column on a wall backed by masonry can be a 1 in strip with brick behind it.
6. Confirm with a bradawl or a 1/16 in bit at a point the shelf will hide. Continuous resistance and pale shavings means timber; a sudden give means you found a gap.

A vertical column of nail hits about 1-3/8 in apart is a stud; one isolated hit is a lath nail and will hold nothing. Electronic detectors struggle here for an obvious reason: they read changes in density, and a lath wall is nothing but changes in density.

Can wall shelves for a drawing room hang on an anchor instead?

Sometimes, but never on the authority of a published number, because for plaster there is not one. Two of the anchor data sheets people quote at each other name plaster as an approved base material and then publish load tables that cover everything except plaster.

The numbers those sheets do publish are worth reading anyway. DEWALT gives an allowable tension of 40 lb for a 1/8 in toggle bolt in 1/2 in wallboard, after applying a safety factor of 4.0 to an ultimate of 150 lb. TOGGLER records an ultimate pull-out of 265 lb for its 1/4-20 SNAPTOGGLE in 1/2 in drywall and states that industry standards recommend a quarter of the ultimate test load. Both figures are drywall figures, and a wall built from lime, sand, hair and 1/4 in softwood strips is not drywall.

So an anchor is the fallback for a piece that cannot reach timber, sized generously and loaded lightly. Conservation practice points the same way: Brief 21 shows loose plaster pulled back to the lath with flat-head wood screws and plaster washers, a fixing chosen because it spreads bearing over a wide disc instead of one crumbly ring.

What does the hole itself do to the lath?

It can remove most of the strip you were hoping to grip. A SNAPTOGGLE in the 3/16-24 or 1/4-20 size wants a 1/2 in hole; the larger sizes want 3/4 in. DEWALT's wing toggle wants 3/8 in for the 1/8 in anchor and 5/8 in for the 1/4 in one. Set those against a lath strip about 1 in wide and the arithmetic is unkind.

Which gives the one piece of aiming advice that matters here: centre a toggle hole on a 3/8 in gap between courses rather than on the middle of a 1 in lath, so the bit opens the void instead of eating the timber. Cutting halfway through a lath leaves a hinge, and a hinge flexes every time the shelf is loaded.

Check the cavity too. TOGGLER specifies 1-7/8 in of minimum clearance behind the wall and a grip range of 3/8 in to 3-5/8 in, which a build-up of about 1 in sits comfortably inside. DEWALT's smallest wing needs 1-1/16 in of clearance. A stud bay gives you that; a furring strip over solid brick does not, and the toggle never opens.

One more line from the TOGGLER sheet deserves a shelf-buyer's attention: holding strength varies inversely with hole diameter and with the distance of the load from the wall. A shelf holds its load 3.5 in (9 cm) out from the surface, so the top fixing is being levered outward, which is the direction every hollow-wall anchor is weakest in.

From the shop

5-Piece Pine Ledge Wall Shelf Set

Five pieces: three hexagons 13.8 / 11.8 / 9.8 in wide plus ledges at 19.7 in (50 cm) and 27.6 in (70 cm), all 3.5 in (9 cm) deep in 0.6 in (1.5 cm) sanded pine under a clear matte lacquer. Wall mounted on keyhole hangers, rated up to 11 lb (5 kg) per piece.

View the 5-piece pine ledge shelf set — dimensions & current price

Which pieces in a five-piece set can reach two studs?

The long ledge can; the hexagons cannot. Houseland lists a long ledge at 27.6 in (70 cm) and a short one at 19.7 in (50 cm), both 3.5 in (9 cm) deep. Modern framing is commonly set at 16 in centres, and at that spacing a 27.6 in board crosses a full bay and reaches a second stud with room to spare, while the 19.7 in board only manages it if the studs fall kindly.

The hexagons are a different problem. The widest is 13.8 in (35 cm) across, narrower than a 16 in bay, so each is a single-fixing decision: one stud, or one anchor in a gap between lath courses. Plan the arrangement around the columns you found, and let the spacing between pieces absorb the difference.

Do not assume the spacing before you measure it. Brief 21 makes the point that builders of now-historic houses had no codes to help them size structural members, and a drawing room in a Victorian flat may have been subdivided twice since. Two magnet columns and a tape give you the real figure in about four minutes.

The keyhole hanger adds a constraint: the screw head has to sit a precise distance proud of the wall for the slot to drop over it, which is easier over timber than over an anchor. It is why a keyhole mount rewards marking carefully before you drill anything.

Why does the crack come back a year after the shelf goes up?

Because wood lath is a seasonal material. Brief 21 attributes horizontal cracking to lath movement: the timber absorbs moisture from the air and expands and contracts as humidity rises and falls, so cracks reappear year after year, and a nail holding the edge of a lath may rust or loosen while that is happening.

A hairline crack that reopens each winter in the same 6 in stretch above a fixing is the wall moving, not the shelf failing. Rake it out and fill it rather than adding a second screw, which only gives the movement another place to concentrate. Pine responds to the same swings, which is why damp rooms are hard on timber shelving in general.

Vibration is the other key-killer, and the Brief's own list is blasting, a train line, a busy highway and repeated sonic booms. A hammer drill is not on that list, but it delivers the same input at point-blank range. Switch percussion off before the bit touches the wall.

What I'd do

1. Magnet-sweep the whole run first and mark every column, then design around what is actually there.
2. Put the 27.6 in ledge where it crosses two columns. It is the piece that will carry books, and two timber fixings beat one.
3. Hang each hexagon on a single stud where one is available, at the height its column allows.
4. For anything stranded between studs, use a toggle centred on a 3/8 in gap, with hammer action off, a sharp bit, a pilot first, and the hole opened out in stages.
5. Load light and load low. Houseland publishes 11 lb (5 kg) per piece and a board thickness of 0.6 in (1.5 cm), so a stack of paperbacks is inside the rating and a stack of art books is not.
6. Leave the wall a week and look again. Fresh hairlines around a fixing mean the key let go and the load wants moving, not tightening.

If the wall defeats you everywhere, the rest of the wall shelves range includes narrower pieces that need one fixing each, an easier ask of hundred-year-old plaster than a long board is.

Shop wall shelves from Houseland

-20%9-Piece Pine Hexagon Wall Shelf Setfrom $165.50$206.88-20%6-Piece Rounded Pine Box Wall Shelvesfrom $160.78$200.96-20%6-Piece Pine Cube and Ledge Wall Shelvesfrom $152.00$190.00-20%6-Piece Staggered Pine Wall Shelvesfrom $151.15$188.94-20%6-Piece Pine Honeycomb Wall Shelvesfrom $146.43$183.03-20%5-Piece Matte Black Wall Shelf Setfrom $155.59$194.49

See all wall shelves →