A sound tarmac surface may be suitable for a resin bound overlay, but an overlay should follow assessment rather than assumption. Cracks, soft areas, levels and drainage all matter. A new decorative surface cannot reliably conceal movement or deterioration in the base beneath it.
Assess more than the appearance
The installer should inspect the existing surface, including edges, utility trenches and areas where vehicles turn. A base can look reasonably tidy while containing weak or poorly supported sections. Identify repairs and uncertainties before treating the existing drive as a suitable foundation.
Ask whether the base is porous or dense. These are different drainage situations. Water that passes through a resin bound top needs an appropriate route afterwards; it cannot be assumed to infiltrate through an impermeable layer below.
Check the finished levels
The new wearing course adds height. Door thresholds, garage entrances, drainage channels and gates therefore need checking. A detail that works at the centre of the driveway may be unsuitable where the surface meets the house or pavement.
Edges must contain and support the new material. A thin feathered edge is not an adequate way to disappear an overlay into an unsuitable boundary. Agree how transitions and exposed edges will be formed using the requirements of the selected system.
Know when removal is more sensible
Extensive cracking, ongoing settlement or unclear support can make retention inappropriate. In other cases, local repairs and a designed overlay may be viable. The decision depends on inspection and the manufacturer's requirements, not simply whether the old surface is called tarmac.
Keep a record of what is retained beneath the new finish. That record will be useful if a future repair or drainage investigation is needed.
Before agreeing: Ask what evidence supports retaining the base, which repairs are included and where rainwater will go through the complete driveway. An attractive blend should come after those questions have clear answers.
Discuss your project
Considering resin bound for your driveway or path? Ask Smart Paving to assess the existing base, levels and drainage alongside your preferred blend. Arrange a site visit.
Explore our resin bound service. See the resin bound colours and finishes guide.
Related reading
- What base does a resin bound driveway need?
- Cracks beneath a resin driveway: why the old base matters
- Why a resin bound surface can still need drainage channels
