Interior projects
Two-tone and wainscot walls: proportions, paint and a sharp line
A colour split at a third of the wall height, darker below, is the classic. Here is how to choose the height, how much of each colour to buy, and how to get a line that is straight and sharp.
Why split a wall
Two colours on one wall go back to the panelled rooms of old houses, where the lower part of the wall was wood panelling, the wainscot, and a chair rail protected the plaster from chair backs. Painted versions keep the look and the practicality: a darker, tougher lower colour hides scuffs from chairs, shoes and vacuum cleaners, and a lighter upper colour keeps the room bright. The same idea works with a painted line alone, with a moulding at the line, or with real panelling or beadboard below painted in enamel.
Where to put the line
The traditional proportions divide the wall in thirds:
| Split | On an 8 ft wall | Effect |
|---|---|---|
| About one third | 32 to 36 in | Classic chair-rail height; the room feels grounded |
| About two thirds | 60 to 66 in | Tall wainscot or board and batten; dramatic, good in dining rooms and halls |
| Half | 48 in | Cuts the room in two; usually avoided |
| Picture-rail height | A foot or so below the ceiling | Lowers a tall ceiling visually |
The one height to avoid is halfway, because equal bands of colour make the eye see two rooms stacked on top of each other. If furniture matters, set the line just above the backs of the dining chairs or the top of the sofa, so the line does not cut through them.
Choosing the colours
The usual pairing is darker below and lighter above. Both colours should come from the same “family” of lightness steps, typically two or three steps apart on a paint strip, for a split that looks deliberate. A white or off-white upper wall with any colour below is the safest choice; two mid-tones close together can look like a mistake. If the lower colour is dark, it may need a third coat or a tinted primer over a light wall; dark colours and LRV explains when.
Sheen can differ between the two colours, and often should; the paint sheen comparison sets out what each level does. A satin or semi-gloss lower wall is easier to wipe clean where chairs and shoes hit it, while an eggshell or matte upper wall hides the imperfections of the plaster. Where the lower part is real panelling or beadboard, it is painted in trim enamel, usually semi-gloss, like the rest of the woodwork. Test both colours together on a sample board held at the split height before buying full cans.
How much of each colour
Splitting the paint by thirds, a third of the total for the bottom and two thirds for the top, goes wrong because doors and windows are not shared evenly. A door runs from the floor to 80 in, so it takes a full-height bite out of the lower colour and a smaller one out of the upper. A window usually starts about 36 in from the floor, so with a chair-rail split it sits entirely in the upper colour.
A 12 × 12 ft bedroom split at 32 in
8 ft walls, one door and one window, two coats of each colour at 350 sq ft per gallon, 5% allowance.
- Perimeter: 48 ft
- Lower: 48 ft × 32 in = 128 sq ft, less 8 sq ft of door = 120 sq ft; window none
- Upper: 48 ft × 64 in = 256 sq ft, less 12 sq ft of door and 15 sq ft of window = 229 sq ft
- Lower colour: 120 ÷ 350 × 2 × 1.05 = 2.88 quarts, buy 3 quarts
- Upper colour: 229 ÷ 350 × 2 × 1.05 = 1.37 gallons, buy 1 gallon + 2 quarts
- Colour line: 48 ft less 3 ft of doorway = 45 ft, one roll of tape
From the two-tone wall calculator, which splits each door and window at the line.
A hallway with a taller split
A 20 ft run of wall, 9 ft high, two doors, no windows, split at 36 in.
- Lower: 20 × 3 = 60 sq ft, less 2 doors × 9 sq ft = 42 sq ft: 1.01 quarts, buy 2 quarts
- Upper: 20 × 6 = 120 sq ft, less 2 doors × 11 sq ft = 98 sq ft: 2.35 quarts, buy 3 quarts
The lower colour is a hair over a quart because of the allowance. In a hallway, the second quart is the touch-up supply for the most scuffed paint in the house.
A moulding at the line
A chair rail, or a picture rail higher up, hides the colour line and protects the wall. It makes the paint job easier, because the colours meet behind a piece of wood rather than at a taped edge, and it needs its own trim enamel. The trim paint calculator takes a chair-rail length, and the quart maths for trim covers the enamel. For a printed band instead of a painted line, the wallpaper border calculator counts spools.
Getting a level line
Floors and ceilings are rarely level, and a line measured up from an uneven floor wanders. Use a level line instead:
- Mark the split height at one point, usually the most visible corner.
- Carry it round the room with a laser level, or a long spirit level and a pencil, joining the marks.
- Check the line against the floor at the far corners. If the floor slopes so much that a level line looks wrong against the baseboard, split the difference: a line parallel to the floor often looks better than a perfectly level one in an old house.
Taping for a sharp line
- Paint the lighter colour first, over its own area and an inch or two past the line. Let it dry.
- Tape along the line on the light colour’s side, pressing the edge down firmly.
- Seal the tape edge with a thin coat of the light colour. Any bleed under the tape is now the light colour, which is already there, and it closes the gap.
- Paint the darker colour, two coats.
- Pull the tape while the last coat is still slightly wet, at a low angle, back on itself.
The seal coat is the step that separates a crisp line from a fuzzy one, and it costs five minutes.
Stripes: the two-tone wall taken further
Painted stripes use the same method across a whole wall. The trick is to make them fit: a 12 ft wall does not take a whole number of 12 in stripes with the base colour at both edges. Round the number of bands to the nearest odd number and divide the wall by it.
Vertical stripes on a 12 × 8 ft wall
- 144 in ÷ 12 in = 12 bands, rounded to the odd number 13
- True stripe width: 144 ÷ 13 = 11.08 in, six stripes in the second colour
- Base colour over the whole wall: 2.3 quarts, buy 3 quarts
- Stripe colour: 1.11 quarts, buy 2 quarts
- Tape: 96 ft, one roll
From the striped wall calculator.
Common mistakes
- Splitting the paint by thirds. Openings do not split evenly; calculate each colour.
- Splitting at half height. A third or two thirds looks intentional.
- Measuring the line from the ceiling. Use a level line from the floor side.
- Painting the dark colour first. Light first, then seal the tape with it.
- Leaving the tape on until everything is dry. It can tear the film; pull it while wet.
- Forgetting the moulding’s paint. A chair rail needs a quart of enamel.
For a single wall in one strong colour, see the accent wall calculator; for the order of work in the rest of the room, painting a room.