Driveway Advice
Can resin bound be laid over existing concrete or tarmac?
Yes, resin bound can sometimes be laid over existing concrete or tarmac, but only when the base is stable, sound and suitable for the traffic it will carry. Cracks, movement, poor levels, contamination and drainage problems must be dealt with first. An overlay also does not automatically become permeable: if the base below is impermeable, the completed construction still needs a compliant route for surface water.
The condition of the base decides whether an overlay is sensible
DALTEX's published guidance lists tarmac, asphalt and concrete as possible resin-bound bases and says the base must be stable and suitable for its expected load. A site survey should look for movement, settlement, crumbling edges, standing water and widespread cracking. Resin bound is a decorative wearing course; it should not be used to hide a failed structure below it.
Concrete and tarmac need different preparation
Both surfaces need to be clean, dry and free from material that could prevent adhesion. Concrete may need a compatible primer and careful treatment of joints. On tarmac, the installer needs to establish that the material is sound rather than soft, contaminated or breaking up. Manufacturer instructions for the chosen resin system should control the final preparation, depth and mixing specification.
Cracks and joints cannot simply be covered
The DALTEX installer guide says joints or cracks in an existing concrete or macadam base should be broken out and reinstated with suitable compacted base material. This matters because movement from below can reflect through the new surface. Ask the quote to identify visible defects and explain the repair method instead of accepting a general promise to prepare the area.
An overlay is not automatically a permeable driveway
Resin-bound surfacing can let water pass through its own layer, but a non-permeable concrete or dense tarmac base beneath it will still block infiltration. Planning Portal says a front-garden surface generally avoids planning permission when it is permeable or directs water to a lawn or border; more than 5m² of impermeable surfacing that does not do so generally needs permission. The quotation should describe the full water route, not just label the top layer permeable.
Sometimes a new base is the better specification
If the existing surface is badly cracked, moving, poorly drained or unsuitable for the expected vehicle load, removal and a properly designed new base may be more defensible than an overlay. That is a site-specific construction decision. Ask for the overlay and rebuild options to be described separately so the price difference and risk are visible.
What to ask before accepting an overlay quote
- What evidence shows that the existing base is stable enough to retain?
- How will every visible crack, joint and failed edge be treated?
- What cleaning, priming and preparation does the resin manufacturer require?
- Where will rainwater go after the work is complete?
- What parts of the base, if any, are excluded from the workmanship guarantee?
| Check | Potentially suitable | Reason to investigate or rebuild |
|---|---|---|
| Structural condition | Sound, stable and designed for the expected traffic | Movement, settlement or widespread failure |
| Cracks and joints | Defects can be properly broken out and reinstated | Unexplained or continuing movement |
| Surface condition | Clean, dry and able to accept the specified preparation | Oil, loose material, severe degradation or trapped moisture |
| Levels and drainage | Suitable falls and a clear destination for water | Standing water or no compliant drainage route |
| Permeability | The full base and sub-base are permeable, or water is otherwise managed | Only the resin top layer is permeable |
Frequently asked questions
- Can resin bound be laid straight over block paving?
- DALTEX does not recommend block paving, flags or loose gravel as a direct base because movement and joints below can lead to cracking. A suitable stable base normally needs to be designed instead.
- Will resin bound repair cracks in my old concrete?
- No. Covering cracks does not remove their cause. The defects and any movement need to be assessed and treated before the resin-bound layer is installed.
- Is resin bound over concrete SuDS compliant?
- Not automatically. Resin bound may be permeable, but an impermeable concrete base below it prevents water soaking through the complete construction. The design needs a lawful drainage route for the site.
- Is an overlay always cheaper than a full rebuild?
- It may involve less excavation when the retained base is genuinely suitable, but an honest comparison depends on repairs, levels, drainage and risk. Ask for both scopes in writing where the existing base is doubtful.
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