Guide · For the trade
Curved stair runner: how to specify a runner for winders, curved and spiral stairs
A curved stair runner is cut and fitted one tread at a time where the stair turns: each pie-shaped winder gets its own piece, joined at the riser so the join is hidden under the nosing, and the straight flights above and below are installed as a continuous runner. Allow 15 to 25 percent more material than a straight stair of the same count, choose a solid, texture or small all-over pattern rather than a stripe or a border, and specify a Hollywood (wrapped) installation rather than a waterfall.
This guide is for the designer drawing a stair with winders, a sweeping curved flight or a spiral, and the junior who has to write the order. It covers the three kinds of curve, how the runner is cut at each, what the pattern does on a turn, the width and the yardage, and what to tell the installer.
The three kinds of curved stair you are drawing
Winder stairs are a straight stair with two to four pie-shaped treads replacing a landing at a 90 or 180 degree turn; the stair runner with landing guide covers the turn when there is a landing instead. A curved or radial stair sweeps continuously, every tread wider at the outside than the inside, often with a curved stringer and a curved wall. A spiral stair turns around a center post, with treads that come almost to a point at the inside. All three are fitted the same way at the turn; the difference is how many treads are fitted singly: two to four on a winder stair, all of them on a curved flight or a spiral.
Can you put a runner on a curved staircase?
Yes, on all three. The only limit is the pattern, and the fact that a runner on a curve cannot run as one continuous piece. On a straight stair the runner is one length, upholstered over each nosing. At a curve, each tread is a different shape, so the installer templates the tread, cuts the runner to the template with the pile direction kept consistent, and joins the pieces at the back of the tread where the riser meets it. Done by an installer who fits curved stairs regularly, the runner reads as continuous; done by one who does not, the joins show as pattern steps and mismatched pile direction, which is why we assign curved work to installers who have done it before, anywhere in the country.
What the pattern does on the turn
| Pattern | On the winders | Verdict |
|---|---|---|
| Solid or heathered texture | Nothing to match; pile direction is the only concern | Best choice for any curve |
| Small all-over pattern, under 4 in repeat | Repeat is small enough that the cut pieces read as the same cloth | Good |
| Stripe running up the stair | Stripes converge at the inside of the turn and fan at the outside; each winder shows the stripe at a new angle | Works only if the client wants the fan; see the striped runner guide |
| Border or woven edge | Border must be mitered at every winder, each miter a cut in the border | Avoid; use a bound or serged edge instead |
| Large repeat, over 12 in | Repeat cannot be matched across pie-shaped pieces | Avoid |
Wool Wiltons and hand-loomed wools fit well on curves because the backing is supple; a stiff tufted carpet fights a tight inside radius. The wool stair runner guide covers the constructions we spec for stairs.
Width, the reveal and a curve
Runners come 27, 32 and 36 inches wide, or are cut from broadloom to any width. On a curve the reveal changes with every tread: a 27-inch runner on a winder that is 36 inches at the outside and 14 inches at the inside leaves a reveal on the outside and nothing on the inside. The usual answer is to keep the runner width constant and let the inside reveal close up on the winders, which is what the eye expects. On a spiral, where the inside of every tread is under 10 inches, specify full carpet on the treads with the edge finished at the outside only. The installer's template decides the final width on each winder; the order gives the straight-flight width and the edge finish.
Yardage and the order
Count the straight treads, the winders and any landing separately. A straight tread with a 7.5-inch riser takes about 19 inches of runner. A winder takes its full outside width plus 3 inches for the join, and the offcuts are waste. Add 15 percent for a stair with three winders, 25 percent for a full curved flight, more for a spiral. Order from one dye lot in one length; a second length from a second lot will show at the turn. The order should say: the stair count by type, the runner width, the edge finish (bound, serged or woven edge), Hollywood installation, and the pad. The measuring guide covers the site measure.
What to tell the installer
- Hollywood installation on the winders and the curve, so the runner wraps each nosing and the join lands under it. A waterfall installation cannot follow a curve.
- Pad on every tread including the winders, 1/4 to 3/8 inch dense felt or rubber, cut to the tread shape and stopped 1 inch inside the runner edge.
- Pile direction down the stair on every piece, including the winders, so the color reads the same from the bottom.
- Template each winder before cutting, and dry-fit the pieces before any staples go in.
- No stair rods on the winders. Rods are straight; a rod across a pie-shaped tread sits at an angle. Rods on the straight flights only, if the client wants them.
Questions designers ask
Can you put a stair runner on a curved staircase?
Yes. The straight flights are installed as a continuous runner and each curved or winder tread is templated and cut as its own piece, joined under the nosing of the tread above. Specify a solid, a texture or a small pattern, a Hollywood installation and an installer who fits curves.
What is the 27 rule for stairs?
It is the 27-inch standard runner width, which leaves about 4 to 5 inches of tread showing on each side of a 36-inch stair. On a curve, the inside reveal closes up at the winders while the outside stays, which is normal; a 32-inch runner on a wider stair keeps the same proportion.
How do you fit a stair runner on winder stairs?
One piece per winder, cut from a template of the tread with the pile direction consistent, upholstered over the nosing and joined at the riser. A three-winder turn takes three pieces and about 15 percent extra runner for the offcuts.
Does a stair runner work on a spiral staircase?
It works, but the inside of each tread is too narrow for a reveal, so most designers specify full carpet on the treads, cut from the same runner or broadloom, with the edge finished at the outside only. The construction should be supple: a wool Wilton or a hand-loomed wool rather than a stiff tufted.
Are curved staircases and stair runners still in style?
A curved stair is architecture, not a trend, and a runner is how most designers soften it: it keeps the wood visible at the edges, quiets the stair, and makes the turn safer. A wool runner in a texture or a small pattern is what we spec most on a curve.
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