Do I need underlay under a stair runner?

Yes, in most cases. Pads protect the runner where it bends over the nosing, make the stairs quieter and more comfortable, and help the runner last longer.

What thickness of pad is best for stairs?

Thin and firm. A thick, soft underlay lets the runner flex over the nosing, which wears it faster and can feel less stable underfoot. Follow the runner maker's advice where given.

Do I need pads if the runner goes over carpet?

Usually not. The carpet already acts as a cushion, and an extra layer makes the runner harder to fix tightly.

Components

Stair Runner Pads and Underlay

What goes under a stair runner, why firm beats soft on stairs, and how to cut and fit a pad for every tread.

Written by the StairRunner.co editorial team · Updated 4 September 2026

Close-up of a short, dense carpet pile

A stair runner pad is a piece of underlay fitted to each tread, under the runner. It is not one continuous strip like room underlay: each pad covers the tread and wraps over the nosing, and stops short of the runner edges so it never shows. Pads make the runner more comfortable, quieter and noticeably longer-lasting.

What pads actually do

Protect the runner: the nosing is where a runner wears first. A pad cushions the runner as it bends over the edge, reducing wear on the backing.
Reduce noise: footsteps on bare timber are loud; a pad absorbs much of the impact.
Improve comfort: the stairs feel softer and the runner looks fuller.
Protect the stairs: grit is held away from the timber.

Fig.Fitting a runner in six stages. The order most fitters follow on a straight flight. The crease fixing is what keeps the runner tight and safe underfoot.

Types of stair pad

Common stair underlay pad types
Type	Feel	Best with
Felt	Firm, thin	Woven wool, sisal and flat-weave runners
Rubber or rubber crumb	Firm, dense	Most runners; good on busy stairs
Felt and rubber combination	Firm with some give	A good all-round stair choice
PU foam	Soft	Light use only; can feel unstable on nosings

Why firm beats soft on stairs

In a bedroom, a thick soft underlay feels luxurious. On a staircase it can be a problem: a soft pad lets the runner roll and flex over the nosing, which wears the backing faster and can make the step edge feel less certain underfoot. Choose a thin, dense, firm pad. If in doubt, ask for underlay rated for stairs.

Fig.Waterfall versus Hollywood fitting. A waterfall runner drops straight from the nosing to the next tread, leaving a small gap under the nose. A Hollywood (French cap) runner is tucked under the nosing and fixed tight to the riser for a tailored line.

Sizing and fitting pads

Cut each pad slightly narrower than the runner — usually about 1 in (2–3 cm) in from each edge — so it is never visible at the sides. The pad should cover the tread from the crease (or from the tack strip, if used) and wrap over the nosing. It should not run into the crease itself, where it would stop the runner from being pushed down and fixed tightly. Fix pads with a few staples or a light adhesive.

Pads with different runner materials

Natural fibres like sisal and seagrass, and flat-woven runners, usually do best on a thin felt pad, which supports them without letting them flex too much. Wool and nylon cut piles can take a slightly thicker felt-and-rubber pad. Check the runner maker's advice: some specify an underlay type, and using the wrong one can affect any guarantee.

Pads under a runner over existing carpet

If you are fitting a runner over stair carpet, you do not usually need pads — the carpet already provides a cushion, and an extra layer makes the runner harder to fix tightly. See runner over carpet for how to fit it.

Should you reuse old pads?

Generally no. Old pads compress and crumble, especially foam and older rubber, and they hold dust. They are inexpensive compared with the runner, so fitting new pads is good value.

Frequently asked questions

Do I need underlay under a stair runner?: Yes, in most cases. Pads protect the runner where it bends over the nosing, make the stairs quieter and more comfortable, and help the runner last longer.
What thickness of pad is best for stairs?: Thin and firm. A thick, soft underlay lets the runner flex over the nosing, which wears it faster and can feel less stable underfoot. Follow the runner maker's advice where given.
How wide should stair runner pads be?: Slightly narrower than the runner — usually about 1 in (2–3 cm) in from each edge — so the pad is never visible.
Do I need pads if the runner goes over carpet?: Usually not. The carpet already acts as a cushion, and an extra layer makes the runner harder to fix tightly.