Resin-bound vs resin-bonded: what's the difference?

The short answer

Both systems use natural stone and a resin binder, but they're put down in completely different ways. Resin-bound stone is forced-mixed so that every piece of aggregate is coated in resin before it's trowelled down — the result is a smooth, seamless surface with tiny voids through it that can let water drain away. Resin-bonded stone is the opposite order: a layer of resin is rolled onto a solid base, then dry stone is scatter-coated over the top and only the bottom of each stone is glued down — giving a textured, anti-slip but completely impermeable surface that sheds loose grit.

If you only remember one thing: bound is stone mixed through resin and laid smooth; bonded is loose stone glued onto resin and left rough. Bound is the premium, longer-lasting choice for driveways and patios — and it's the only system we install.

What is resin-bound surfacing?

Resin-bound is the system Terralume specialises in. On site, naturally rounded, kiln-dried aggregate — roughly 2–5 mm stone, per the product technical data sheet — is loaded into a forced-action mixer with a two-part aliphatic, UV-stable polyurethane resin at around 7% by weight of the aggregate. The mixer coats every single stone evenly, and the wet mortar is then barrowed out and hand-trowelled into a smooth, joint-free layer, usually about 18 mm minimum for vehicular areas and around 15 mm for pedestrian paths and patios.

Because each stone is fully encapsulated and the layer is built up thick, the surface has a network of tiny interconnected voids running right through it. That's what makes resin-bound permeable — but only when it sits on a base that can also take the water away. Over a sealed concrete slab it's not draining anywhere; over an open-graded, free-draining build-up it becomes a genuinely permeable, WSUD-friendly surface (Water Sensitive Urban Design — the Victorian stormwater framework). The headline traits:

• Smooth and seamless — one continuous wear course with no joints to crack and nothing to lift.
• No loose stone — every piece is locked in, so nothing scatters onto the lawn, into the garage or down the drain.
• Permeable-capable — drains freely over a suitable permeable base, which can help with stormwater rules.
• UV-stable — the aliphatic binder resists the yellowing that affects cheaper aromatic resins outdoors.
• Strong under load — laid at full depth over a sound base, it carries cars and light 4WDs comfortably.

We cover the full method — mixing ratios, base prep and finishing — on our how it works page, and what it costs in our resin driveway cost guide.

What is resin-bonded surfacing?

Resin-bonded flips the process. Instead of mixing stone through the resin, the installer first rolls or squeegees a coat of resin onto an existing solid base (concrete or asphalt), then scatter-coats dry stone over the wet resin by hand or hopper. Only the lower portion of each stone touches the glue, so the finished surface is a single layer of stone standing proud — rough, sharp-textured and grippy underfoot. The excess that didn't bond is swept off once it cures.

That construction gives bonded its strengths and its weaknesses. It's a thin coat (a single stone deep, roughly 3–6 mm), so it goes down fast and cheap, and the coarse texture makes it genuinely anti-slip — which is why you'll see it on ramps, steep paths and around some pools. But because the stones are only glued at the base and there are no voids through to a permeable layer, resin-bonded is completely impermeable: rain runs straight off it, so it needs proper falls and drainage like any sealed surface, and it offers no stormwater benefit. Over time, surface stones can work loose under traffic and weather, so it tends to shed grit the way the bound system never does. In short:

• Rough, textured, anti-slip — strong grip, useful on slopes and ramps.
• Impermeable — water sheds off; no permeable/WSUD benefit.
• Sheds loose stone — surface aggregate can dislodge under traffic over time.
• Thin and quick — a single-stone layer, generally cheaper to lay.

Resin bound vs resin bonded: side-by-side

Here's the difference at a glance. There's no single "winner" — bonded has its niche on grippy ramps and budget jobs — but for the seamless, permeable-capable, low-maintenance surface most homeowners actually want on a driveway or patio, resin-bound leads on nearly every line.

Which suits a driveway?

For a driveway, resin-bound is the right surface in almost every case. A drive takes daily car loads, turning tyres and years of weather, and the bound system answers all three: laid at full vehicular depth (~18 mm minimum) it carries the load, the seamless wear course resists the cracking that ages concrete, and there's no loose stone to scatter into your garage or jam in tyre treads. It can also be made permeable over an open-graded base, which is increasingly useful for meeting Greater Geelong stormwater expectations on new or replacement driveways.

Resin-bonded on a driveway is generally a false economy. Because it's only a single stone deep and the aggregate is glued at the base rather than bound through, repeated vehicle traffic tends to dislodge stones, and being impermeable it offers no drainage benefit while still needing falls and drainage detailed in. Its real home is somewhere grip matters more than longevity — a steep ramp, a slippery threshold or an anti-slip overlay on existing concrete.

Why Terralume installs resin-bound only

We're a specialist, not a generalist — and we deliberately offer one system done properly rather than two done half-heartedly. We install resin-bound only because it's the surface that delivers what homeowners on the Bellarine and Surf Coast actually ask us for: a seamless finish with no loose stone, a permeable option that works with WSUD and council drainage rules, and a UV-stable, long-life surface we're confident standing behind with a 5-year written workmanship guarantee.

We use a two-part aliphatic, UV-stable polyurethane resin from a reputable supplier, dose it to spec (~7% by weight of aggregate), and verify aggregate, coverage and depth against the product TDS on every job — never guessed. If your project genuinely needs an anti-slip bonded coat for a ramp, we'll tell you honestly and point you to the right trade rather than sell you something we don't believe is the best result.

Want a number for your own project? Our online tool gives you a ballpark in seconds — get an instant estimate — and every job is then individually quoted after a free site assessment, where we bring real stone samples and check your base and drainage in person. As a rough guide, installed resin-bound runs around A$90–230/m² depending on the surface, base build-up and access (driveways sit at the higher end). That's indicative only and confirmed in a fixed written quote.

Frequently asked questions