Resin bound surfacing works by mixing natural stone aggregate into UV-stable polyurethane resin and trowelling it flat onto a prepared base. The aggregate is locked into the resin layer, not scattered on top, which is what separates resin bound from a resin bonded scatter coat. A bonded coat sheds loose stones within months; a properly laid resin bound surface stays stone-free and permeable for years. Permeability matters because it allows rainwater to drain through the finish rather than running off the surface, which is how resin bound driveways satisfy SuDS drainage requirements and, for most front drives, avoid the need for a planning application.
The base beneath the resin determines how long the surface holds. Brentwood properties often sit on clay sub-bases that shift under load when excavation depth is insufficient or compaction was never done correctly. An MOT Type 1 sub-base, crushed aggregate compacted to the right depth, distributes load evenly and prevents the resin layer from cracking or lifting. Where the existing tarmac or concrete is structurally sound, crack-free, and correctly drained, a resin bound overlay avoids the cost of a full dig-out. Where it has failed, soft patches, movement cracks, or drainage falls that send water the wrong way, removal is the only option that gives the new surface a chance of lasting.
Drainage falls are set at sub-base stage, not corrected after the resin is down. Channel drainage and edge restraints are fitted as part of the installation to direct surface water away from the property and into the correct run-off route. Essex Building Regulations drainage requirements apply where a new driveway changes how surface water leaves the site, so drainage compliance is checked at the assessment stage rather than assumed. Once the surface is laid and cured, maintenance is straightforward: occasional power washing with a low-pressure setting keeps the aggregate clean without disturbing the resin bond. Heavy pressure washing or the wrong nozzle angle can loosen the surface, so the method matters.