You can train on bare concrete. You should not lift on it. Concrete cracks under dropped weights, chips your plates, holds the cold, and sends every drop through the slab into the house. A 20mm rubber tile fixes all four.
This is the most common question from people converting a garage, so here is the honest comparison.
The short version
| Bare concrete | 20mm rubber tiles | |
|---|---|---|
| A dropped dumbbell | Chips the concrete and can crack the slab; damages the weight | Absorbed by the tile; the slab and the weight are protected |
| Noise | A sharp crack that carries through the slab into the rest of the house and next door | A dull thud that stays in the room |
| Cold | Concrete pulls heat out of your feet all winter | 20mm of rubber is a layer of insulation between you and the slab |
| Damp and dust | Concrete sweats and sheds dust onto everything | Rubber is wipe-clean and takes the grit off your kit |
| Grip | Slippery when damp | Grips trainers and bare feet |
| Racks and benches | Uneven concrete rocks the rack | Tiles level out small dips and hold the rack still |
| Resale of the space | Chipped slab to make good | Lift the tiles and the garage is as it was |
| Sprung product | 20mm PRO rubber gym tile, loose-laid, no adhesive |
What actually happens when you drop a weight on concrete
Concrete is strong in compression and weak on impact. A dumbbell landing edge-first concentrates the whole load on a few square centimetres, which is how a garage slab picks up chips and, over a winter, hairline cracks. The plate or dumbbell takes the same hit. And because concrete does not flex, the energy has nowhere to go but through the slab, which is why a 6am session is heard in the bedroom above and often next door.
A 20mm Sprung PRO tile is dense solid rubber. It spreads the impact across the tile, gives the weight somewhere to go, and turns the crack into a thud. That is the mechanism. It is also why the 20mm PRO is the tile most of the 55,000 Sprung home gyms are built on.
The cold nobody warns you about
A garage slab sits on the ground. From November to March it is close to outside temperature, and standing on it in trainers for an hour pulls heat out through your feet. Twenty millimetres of rubber is a real insulating layer.
Laying it in a garage
Sweep the slab. Lay the tiles edge to edge from the back wall forward, no adhesive. Cut the last row with a straight edge and a sharp knife. Add an edge ramp at the door so the car and the trolley roll over it. A single-car garage takes an afternoon.
Questions people ask
Do I need to level or seal the concrete first?
No. A 20mm tile levels out small dips and does not need a sealed slab. Fill any deep holes, sweep the dust, and lay the tiles.
Will rubber tiles trap damp under them in a garage?
Rubber tiles are laid loose, so air moves at the edges and the floor can be lifted to dry if the garage ever floods. If your slab is regularly wet, deal with the water first; no flooring fixes a leak.
Is 20mm enough for a garage gym?
For dumbbells, a rack and everyday barbell work, yes. If you drop a loaded barbell from overhead, keep 20mm across the room and add a thicker layer where the bar lands, such as the 43mm Anti-Shock, which is rated for drops up to 250kg.
Planning the whole conversion? The guide to choosing rubber gym flooring covers thickness, layout and edges, or order a sample and drop a dumbbell on it.
Sprung Gym Flooring has floored more than 55,000 UK home gyms since 2020 and carries more than 1,900 customer reviews. Orders ship from our Glasgow warehouse, with free UK mainland delivery over £300. The code SPRUNG30 takes 30% off at checkout.