Resin bound surfacing has grown from a niche commercial product to one of the most requested domestic driveway surfaces in the UK. The finished result — a smooth, stone-textured surface available in a wide range of aggregate colours — looks contemporary and is genuinely low-maintenance when properly installed. The problem is that the materials are straightforward to buy but the installation has a small margin for error, and that error is invisible until it fails.
Resin Bound vs Resin Bonded — Not the Same Thing
Resin bound: aggregate is mixed thoroughly with resin before laying, so resin coats every stone and the finished surface is smooth, uniform, and fully permeable. Resin bonded: resin is spread onto a base and aggregate is scattered on top. The result is rougher, not permeable, and stones can detach over time. Resin bonded is cheaper and often used by less scrupulous contractors who quote for resin bound and deliver resin bonded. If you cannot see light through the surface when held up, it is likely bonded rather than bound.
"The critical difference is that a genuinely resin bound surface is permeable — water drains straight through it. A resin bonded surface is not. If a contractor is offering resin bound surfacing at a price that seems too good to be true, ask them specifically whether the final surface will be SuDS-compliant and permeable, and ask them to put that in writing."— Interpave — Resin Bound Paving Technical Guidance
The Base Matters More Than the Resin
Resin bound surfacing is typically laid at 15–18mm depth over an existing sound surface (tarmac or concrete) or over a new macadam base. It is not a structural layer — it provides no load-bearing capacity of its own. If the existing surface has movement, cracks, or soft spots, the resin layer will reflect those defects and crack or sink. An honest contractor will assess the existing surface thoroughly before quoting; if they quote without examining the sub-base condition, that is a warning sign.
UV-Stable Resin — Why It Matters
Polyurethane resins used in resin bound surfacing come in two types: aliphatic (UV-stable) and aromatic (not UV-stable). Aromatic resins yellow and degrade with sunlight exposure within a few years. A quality installation should use aliphatic resin throughout. Ask your contractor specifically which resin system they use and request the product data sheet — a reputable installer will provide this without hesitation.
"UV stability is non-negotiable for an outdoor driveway surface. Aliphatic polyurethane resin systems resist UV degradation; aromatic systems do not. The price difference between the two is relatively small at the product level, but significant in terms of the long-term performance of the finished surface."— British Decorators Association — Technical Guidance
Drainage Design
Even though resin bound is permeable, the sub-base still needs to be designed to handle the water that passes through. On clay-heavy ground that drains slowly, a permeable surface can lead to waterlogging if the sub-base saturates. A responsible contractor will assess ground conditions and specify the sub-base accordingly — sometimes including a drainage channel at the boundary between the drive and the public footway.
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