Resin bound: mixed before laying
In a resin bound system, aggregate and resin are combined before the material is spread and trowelled. The result is a relatively even aggregate finish.
The surface can allow water through, but the layers underneath and the overall drainage arrangement must support that function. A porous top layer over an unsuitable base is not a complete solution.
Resin bonded: aggregate onto a coating
In a resin bonded system, resin is applied to the base and aggregate is scattered onto it. This produces a more textured finish.
An ordinary bonded system should not be assumed porous. Its drainage needs to be designed accordingly. Ask for the actual system specification, not just a general promise of a resin driveway.
Source reviewed 30 September 2026: Derbyshire Specialist Aggregates: resin bound and resin bonded.
Questions that make the quote clearer
Ask to see a physical sample of the proposed finish. Consider colour, feel underfoot, edges and the way the surface will meet existing paths.
- Is the system bound or bonded?
- What assessment has been made of the existing base?
- How is rainwater handled?
- Which aggregate and resin specification is proposed?
- What access and aftercare instructions will be provided?
Treat an overlay as a site decision
The fact that there is already concrete or tarmac on the driveway does not establish that it is a suitable base. Cracking, movement, levels and drainage need consideration.
Discuss the outcome you want and the condition of the existing surface before deciding whether an overlay or a more extensive rebuild makes sense.