How do I know if a piece will dent my floor?

Divide the weight by the total contact area. A heavy piece on wide plates is gentle; the same weight on four small feet is not.

Which floors are most at risk?

Soft vinyl and linoleum, then softwood, then engineered wood. Tile and concrete do not dent but can crack under a sharp point load.

Do felt pads help with heavy pieces?

They prevent scratching when something moves, but they compress under high load. For heavy pieces you need area, not softness.

What about underfloor heating?

Heavy pieces are fine over it. The risk is trapping heat under a large flat base, so leave an air gap where you can.

Practical · 4 min read

Protecting Floors Under Heavy Pieces

Point loads dent soft floors. What to put under feet on oak, vinyl, tile and concrete, and how to work out whether you need to.

Furniture does not dent a floor because it is heavy. It dents a floor because of how much weight lands on how little area, and that is a number you can work out before the delivery rather than after.

The arithmetic that decides it

Pressure is weight divided by contact area. Same weight, smaller feet, more pressure.

The Concrete Bench weighs 84 kg and sits on two folded steel plates. Spread across those plates the load is gentle, because the area is large. Put the same 84 kg on four coin-sized feet and the pressure at each one is many times higher, which is exactly where floors fail.

This is why a 62 kg cabinet on a continuous base can be safer for a floor than a 31 kg table on four narrow legs. Weight on its own tells you how hard it is to move, not what it does to the floor. Furniture weight and floor load covers the structural side.

What each floor does

Vinyl and sheet linoleum. The softest common floor and the most at risk. Both are viscoelastic, which means they deform slowly under sustained load and often do not come back. A leg mark that appears over months will still be there months after the furniture moves.
Softwood, especially pine. Dents easily and permanently. A deep dent in softwood can sometimes be raised with steam, which is a repair rather than a prevention.
Engineered and solid hardwood. Tougher, but the finish scratches long before the timber dents. Oak takes a point load better than pine.
Tile. Does not dent. Can crack, usually when a point load lands on an unsupported spot or over a void in the adhesive bed. Grout lines are weak points.
Concrete. Effectively immune, unless it is sealed with something soft.

Spreading the load

The fix is always area. Add material under the feet so the same weight covers more floor.

Hard pads larger than the foot. A rigid pad spreads load outwards. A soft one compresses and transmits the pressure anyway, which is the mistake people make reaching for the thickest felt.
A continuous rail or plate under a long piece, if the design allows it.
A rug with a firm underlay, which spreads load reasonably well and prevents scratching at the same time.
Plywood squares under exceptional loads, which look temporary and work extremely well.

Felt is still the right answer for everything light enough to move. It stops scratching, which is the commonest floor damage by far. Felt pads and floor protection covers sizing and replacement.

The two mistakes

Plastic glides on hardwood. Hard plastic picks up grit and becomes an abrasive. Every time the piece shifts, it cuts. Felt collects the grit instead of driving it into the floor, which is why it works.

Rubber on vinyl and linoleum. Some rubber compounds migrate plasticiser into vinyl and leave a permanent yellow or brown stain under the foot. It can take a year to appear and nothing removes it. Use felt or a hard pad, not rubber, on a resilient floor.

Dragging is worse than weight

Most damage happens during movement, not during years of standing. A heavy piece dragged a few centimetres to straighten it can leave a gouge that no amount of care afterwards undoes.

Lift, do not slide. For anything too heavy to lift, use furniture sliders designed for the floor type, move it in small increments, and remove the sliders afterwards because they are not a permanent foot. Moving concrete furniture has the method for the heavy end.

Underfloor heating

Heavy furniture over underfloor heating is not a structural problem. The concern is thermal: a large flat base sitting directly on the floor can trap heat under it, which in a timber floor means a dry spot that shrinks differently from the rest of the room.

Legs are better than a continuous plinth over underfloor heating, because air moves underneath. Where a piece does sit flat, lifting it a few millimetres on pads solves it.

Check it after a month

Slide the piece gently and look. Early marking is the signal to add area before it becomes permanent, and in a soft floor the first month tells you everything the next ten years will do.

Reality check

Pressure is weight over area. Small feet are the problem, not mass.
Vinyl and linoleum deform permanently. Softwood dents. Tile cracks at points.
Spread load with rigid pads larger than the foot, not with thick soft ones.
No hard plastic on wood, no rubber on vinyl.
Lift rather than drag. Most damage happens while moving.

Common questions

How do I know if a piece will dent my floor?: Divide the weight by the total contact area. A heavy piece on wide plates is gentle; the same weight on four small feet is not.
Which floors are most at risk?: Soft vinyl and linoleum, then softwood, then engineered wood. Tile and concrete do not dent but can crack under a sharp point load.
Do felt pads help with heavy pieces?: They prevent scratching when something moves, but they compress under high load. For heavy pieces you need area, not softness.
What about underfloor heating?: Heavy pieces are fine over it. The risk is trapping heat under a large flat base, so leave an air gap where you can.