Resin Bound vs Resin Bonded Driveways: The Real Difference

The one sentence version

Resin bound means the stone is mixed with resin in a forced action mixer and trowelled out as a solid, permeable, smooth surface. Resin bonded means resin is painted onto a base and dry stone is scattered over the top, giving a rough, non permeable surface that sheds loose stone.

They look similar in a brochure photograph and behave completely differently on a driveway. Most people who say they want resin bonded actually want resin bound.

Side by side

The permeability point matters more than anything else on a front driveway, because a permeable surface keeps you inside permitted development without a separate soakaway.

Why resin bound costs more and usually earns it

In a bound system every stone is coated, so the whole depth is one matrix. It is laid at 15 to 18mm over a solid base and there is nothing for a tyre to pull out. The cost is higher because the aggregate volume is greater, the mixing is a controlled process and the labour window is short. On a hot day in July the installer has minutes, not hours.

Bonded is cheaper because it uses a thin scatter of stone over a resin film. The stone that never bonded washes off over the first two winters, which is why you see bonded drives with bald patches showing the black base underneath.

The base is where the money should go

Neither system is a surface you can lay on soil. Both need a rigid base, normally new tarmac or a concrete slab. On our jobs around Fleet and Farnborough we usually lay 50 to 60mm of base course tarmac on a 150mm Type 1 sub-base, then the resin on top once it has cured.

If your existing tarmac or concrete is sound, overlaying it directly saves £25 to £40 per square metre. If it is cracked, laying resin over the top just transfers those cracks upwards within a year. Any installer who agrees to resin over a failing base without qualification is buying themselves a callback and you a bill.

Grip, heat and UV

Resin bound made with a UV stable aliphatic resin holds its colour. Cheaper epoxy or aromatic polyurethane systems yellow noticeably within three summers, particularly on south facing drives. Ask which resin is being used and ask for the manufacturer datasheet.

For grip, a bound surface with a 1 to 3mm aggregate blend is fine on level ground. On a steep drive we either specify a coarser blend or recommend anti slip quartz in the mix. Bonded genuinely does grip better on steep slopes, which is the one job it still deserves.

Maintenance and repair

Bound resin needs a jet wash on a wide fan a couple of times a year and moss treatment on shaded sections. Weeds only grow on top in surface debris, so keeping it swept largely solves the problem.

Repairs are the weak point. A patch in resin bound will always be visible because the new resin cures at a different shade. That is a reason to make sure services and ducting go in before the surface, not after.

Which we recommend in this area

For nine out of ten driveways in Hampshire and Surrey we specify resin bound over new tarmac. It is permeable, it is comfortable underfoot, it holds its colour if the right resin is used, and it deals well with the leaf litter and clay run off common on plots backing onto woodland.

We keep bonded for steep access ramps and for commercial slopes where grip beats appearance. Call 07538 218723 and we will tell you which of the two your plot actually needs before quoting.