Do You Need an Underlay Under a Rug?
Short answer. You need an underlay under a rug on hard floors such as wood, laminate and tile, and under almost every hallway runner, because it stops slipping and edge-curling. On carpet, a rug-to-carpet gripper stops the rug creeping. A large rug held down by a sofa and chairs on carpet can usually go without one.
By Snoozyn · Updated October 2026
Most people only think about underlay the first time a new rug slides out from under them on a laminate floor. Some rugs need it and some do not; what decides it is the floor, the rug’s size and weight, and whether furniture holds it.
We do not sell underlay or grippers, so this is a plain guide to when they earn their place, plus notes on which rugs in our range move most.
Key takeaways
- Rugs on wood, laminate, vinyl or tile slide far more than rugs on carpet, so hard floors are where underlay matters most.
- Runners and thin flatweaves need grip more than thick tufted or chunky hand-woven rugs, because they are lighter and move with every step.
- On carpet, a rug-to-carpet gripper stops a rug walking across the room rather than slipping suddenly.
- An underlay is usually cut 2–5 cm smaller than the rug on every side so it stays hidden.
- A rug with the front legs of a sofa and chairs on it often stays put without any underlay at all.
When do you need an underlay under a rug?
You need an underlay under a rug whenever the rug sits on a smooth hard floor, is a runner in a walkway, or is light enough to bunch when you step on it. Heavy rugs pinned by furniture on carpet rarely need one.
The quickest test is to stand at one edge and push your foot forwards. If the rug shifts or a ripple appears, it needs grip. Hallways, kitchens and the foot of the stairs are the usual problem spots, because people cross the rug at an angle and it takes the sideways push.
| Floor | Rug type | Underlay? |
|---|---|---|
| Wood, laminate, vinyl | Runner or flatweave | Yes, non-slip |
| Wood, laminate, vinyl | Large tufted or pile rug under furniture | Recommended |
| Tile or stone | Any | Yes, non-slip |
| Carpet | Rug that creeps or ripples | Rug-to-carpet gripper |
| Carpet | Large rug under sofa and chairs | Usually not needed |
What does a rug underlay actually do?
A rug underlay grips the floor and the rug at the same time, so the rug stays flat and in place. Thicker felt versions also add a little cushioning underfoot and a layer between the rug backing and the floor finish.
It stops slipping, keeps edges flat for longer because the rug is not dragged and folded each day, makes a thin rug feel more substantial, and stops the rug backing rubbing a polished floor dull where people walk.
It will not fix a rug creased in storage. If the ends lift after unrolling, flatten it first: see getting a curling or creased rug to lie flat.
Which type of rug underlay should you choose?
Choose a thin PVC or rubber mesh for grip on hard floors, a felt pad for cushioning, or a felt-and-rubber combination if you want both. For rugs on carpet, buy one sold specifically as rug-to-carpet.
Mesh grip underlay
An open mesh, often 2–4 mm thick, adds almost no height, which matters for doors that open over a runner. It suits flatweaves and runners on hard floors.
Felt pad
Dense felt, usually 5–10 mm, adds cushioning but grips less than rubber, so it suits large rugs already held by furniture.
Felt and rubber combination
A felt top with a rubber underside gives grip and softness together, and is the usual choice under a living-room rug on wood. Check your floor manufacturer’s advice first, as some vinyl and lacquered finishes can mark under certain rubber compounds.
Do you need an underlay for a rug on carpet?
You often do, but for a different reason: on carpet a rug does not slip suddenly, it creeps slowly in the direction people walk. A rug-to-carpet gripper locks into the carpet pile and stops that drift.
Creep is worst with rugs that float in front of a sofa and on long, loose carpet. If the front legs of the sofa and armchairs rest on the rug, the furniture usually anchors it. The same logic applies when layering one rug over another.
What size should a rug underlay be?
A rug underlay should be slightly smaller than the rug, usually 2–5 cm in from every edge, so it never shows and the rug edge can lie flat against the floor.
- Measure the rug itself, as hand-woven rugs can vary slightly from the label.
- Subtract 4–10 cm from each dimension, so a 160×230 cm rug takes an underlay of about 152×222 cm.
- Lay the underlay, then unroll the rug over it from one end, smoothing as you go.
- Trim any excess with sharp scissors, rounding the corners slightly.
For runners, keep the underlay a little short of each end so the ends do not form a step.
Which of our rugs are most likely to need one?
The lighter and flatter the rug, the more it needs grip. In our range, the runners and the flatweaves move most; tufted, loop-pile and chunky hand-woven rugs sit heavier.
Our two hallway runners (60×160 and 60×180 cm, 100% polypropylene) and the sisal-look flatweave with a stepped border are thin by design, so on wood or tile we would always put a mesh grip under them. If you are still choosing the length of a runner, our guide to runner sizes for hallways and kitchens covers that first.
At the other end, the chunky hand-woven 100% wool rug in ivory and grey tones has real weight, and in sizes from 200×290 cm upwards it usually sits under enough furniture to stay still. On a polished floor, a felt-and-rubber pad still protects the finish. Round rugs such as the magnolia-print round rug (Ø120 and Ø150 cm) often sit alone in reading corners, so they need grip too.
Every few months, lift rug and underlay together and vacuum the floor beneath; trapped grit is what scratches a floor. Our care guide has general fabric notes.
Frequently asked questions
Can a rug underlay damage a wooden floor?
A good underlay protects a wooden floor more often than it harms it, but some rubber and PVC compounds can mark certain lacquers and vinyl. Choose a product labelled for your floor type and lift it occasionally to let the floor air.
How thick should a rug underlay be?
For grip alone, 2–4 mm is enough and keeps doors clear. For extra cushioning under a thin rug, 5–10 mm felt works well. Anything thicker can make the rug edge feel spongy and turn it into a step people catch their toes on.
Can you cut a rug underlay to size?
Yes. Most mesh, felt and felt-and-rubber underlays are designed to be trimmed with ordinary sharp scissors. Lay it under the rug first, mark the line a few centimetres in from the rug edge, then cut and round the corners slightly.
Will an underlay stop a rug curling at the corners?
It helps once the rug is already flat, because grip stops the daily dragging that lifts corners. It will not remove a curl set in by rolling or storage. Flatten the rug first by reverse-rolling or weighting the corners, then add the underlay.
Do round rugs need an underlay?
Round rugs often need one more than rectangles, because they tend to sit in open spaces such as reading corners or entrance halls with no furniture on them. A thin mesh cut a few centimetres smaller in diameter keeps them still on hard floors.
Can you use double-sided tape instead of an underlay?
Carpet tape holds a rug still, but it can leave residue on wood, lift lacquer when removed and stops you moving the rug to clean. A removable mesh or gripper does the same job and comes away cleanly afterwards.
Shop the story
Thin polypropylene runners that lie low under doors; pair with a mesh grip. Sizes 60×160 and 60×180 cm.
A light flatweave that benefits from grip on hard floors. Sizes 160×230 to 300×400 cm.
A heavy rug that stays put under furniture. Sizes 60×180 runner to 240×330 cm.
