Driveway Advice
How thick should a resin-bound driveway be?
For a domestic driveway carrying vehicles, DALTEX's current guidance and BBA-accredited system use 18mm as the key minimum depth. Its calculator describes 15mm as a minimum for driveways generally and 18mm for heavy traffic, while its BBA guidance adopts 18mm for driveway use. The right specification still depends on the exact resin system, aggregate size, expected load and base design. A quote should state the finished resin-bound depth and the separate base build-up in writing rather than simply promising a resin surface.
Depth is part of a complete system
The visible resin-and-aggregate layer is only one part of a driveway. Its performance also depends on a stable base designed for the expected load, suitable edging, drainage and the manufacturer's mix design. A thicker surface cannot compensate for a weak, moving or poorly drained base, so the quote should describe both layers separately.
Why 18mm is a useful vehicle-use benchmark
DALTEX states that its BBA-accredited Performance UVR system adopts an 18mm minimum depth for driveways. Its installer guidance also specifies 18mm for driveway use and 15mm for foot-traffic areas. This makes 18mm a useful question to raise when comparing domestic driveway quotes, but the installer must still follow the current instructions for the exact product and aggregate grading being supplied.
A lower number may describe a different use
DALTEX's calculator describes 15mm as a general driveway minimum and recommends 18mm for heavy traffic, while its BBA system uses 18mm for driveways. That difference is a reason to identify the system and intended use, not to pick a number in isolation. Paths, patios and pedestrian areas may have a different specification from a parking area that takes repeated vehicle loads.
Natural variation affects material quantities
DALTEX notes that coverage figures are approximate and that natural undulations must be allowed for. The finished depth should be controlled across the whole area rather than inferred only from the number of resin kits delivered. Ask how the installer will set levels, mark coverage areas and check material usage during laying.
Put the measurable specification in the quote
A useful Portsmouth driveway quote should name the resin system, aggregate blend, mix design, intended finished depth, total area and base construction. It should also say how edges, falls, drainage and existing defects will be handled. Those details make competing quotes comparable and give both sides a clear record of what is being supplied.
Five items a proper specification should include
- The exact resin manufacturer and system name.
- The aggregate blend, grading and approved mix design.
- The finished resin-bound depth for each use area.
- The separate base build-up, repairs and compaction method.
- The driveway area, edge detail, levels and drainage arrangement.
| Quote detail | Why it matters | Evidence to request |
|---|---|---|
| Finished resin-bound depth | Vehicle use needs a system designed for repeated load | Depth in millimetres for the named product |
| Base construction | The surface is only as stable as the base below | Materials, compacted depths and repair scope |
| Expected use | A footpath and a parking area do not carry the same load | Vehicles, turning areas and any heavier traffic recorded |
| Mix design | Resin, aggregate grading and binding quartz affect performance | Manufacturer's current installation specification |
| Area and coverage control | Undulations can change material use and local depth | Measured area, level control and coverage plan |
Frequently asked questions
- Is 15mm thick enough for a resin-bound driveway?
- DALTEX's calculator calls 15mm a driveway minimum and recommends 18mm for heavy traffic, while its BBA-accredited driveway system adopts 18mm. Ask which exact system is being quoted and require its current vehicle-use specification in writing.
- Does a thicker resin layer fix a poor base?
- No. DALTEX says the system is only as stable as the base below it. Movement, cracks or weak construction should be diagnosed and repaired rather than covered by extra surface material.
- How can a homeowner check the installed depth?
- The easiest control is a written specification before work begins, supported by set edging levels, marked coverage areas and recorded material quantities. Any intrusive finished-surface test should be agreed with the installer because it can leave a visible repair.
- Should paths and parking areas use the same depth?
- Not automatically. Manufacturer guidance may allow a different pedestrian specification. The quote should identify each area's use and the matching system depth rather than applying one unexplained figure everywhere.
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