Driveway Advice
Can resin bound be laid over block paving?
Resin bound should not normally be laid directly over block paving, paving slabs, setts or flags. DALTEX says these jointed paving products are not suitable bases because the lines and movement below can reflect through the new resin surface and lead to cracking or failure. A resin-bound quote should assess what is underneath the paving, remove the unsuitable layer where necessary, and specify a stable base designed for the expected traffic and drainage requirement.
Block paving is a jointed surface, not a monolithic base
Each block or slab can move independently under vehicle loads, temperature changes and ground movement. DALTEX identifies block paving, setts and flags as unsuitable for a resin-bound base because their joints can transfer movement into the seamless layer above. A surface that looks flat today can still contain hundreds of potential movement lines.
Covering the joints does not remove the movement
Primer, mesh or extra resin cannot automatically turn a moving paved surface into a stable base. Reflective cracking can appear where joints or weak areas below continue to move. The correct solution depends on the underlying construction, so a site survey should establish whether the blocks can be removed and whether the material below can form part of a compliant new build-up.
The replacement base must match the intended use
DALTEX lists suitable bases such as tarmac, asphalt and concrete, subject to the chosen system, preparation and expected load. A domestic parking area needs a base designed for vehicles, while a footpath may have a different build-up. The quotation should record the base material, compacted depths, repair work and finished resin specification separately.
Drainage must be designed through the whole build-up
A permeable resin surface is only part of a permeable system. If the base below is impermeable, water cannot simply drain through into the ground. The design may require a suitable open-graded base, drainage channels, a soakaway or another lawful runoff arrangement. Removing block paving is the point at which that drainage design should be checked, not assumed.
Ask the quote to show what will be removed and rebuilt
A useful quote should state whether the paving will be lifted, how waste will be handled, what existing material can safely remain, and the exact new base and resin build-up. Without those details, two prices may describe very different jobs and very different levels of failure risk.
What to ask before replacing block paving with resin bound
- Will every block, slab or sett be removed before the resin system is built?
- What condition is the existing sub-base in and how will it be tested?
- What new base material and compacted depths are included?
- Will the completed build-up be permeable, or where will runoff go?
- Which resin system, mix design and finished depth will be installed?
| Question | Directly covering the paving | Proper assessment and rebuild |
|---|---|---|
| Joint movement | Still present beneath the resin | Unsuitable paving removed and base designed as a system |
| Cracking risk | Joints may reflect through | Weak areas and movement sources assessed first |
| Drainage | Existing build-up may remain impermeable | Runoff and permeability designed through every layer |
| Load capacity | Unknown unless the old construction is opened up | Base matched to expected vehicles and use |
| Quote clarity | Often described only as an overlay | Removal, base, drainage and resin depths itemised |
Frequently asked questions
- Can resin bound be laid over paving slabs?
- DALTEX says paving slabs, flags and other jointed paving products are not suitable direct bases. Their joints and movement can reflect through and crack the resin surface.
- Can mesh stop the block joints cracking through?
- Mesh can be part of a specified crack-control detail in some situations, but it does not automatically make a moving block-paved base suitable. The manufacturer and installer should approve the complete build-up for the intended load.
- Can the material under the blocks be reused?
- Only after it has been exposed and assessed for material type, depth, compaction, stability and drainage. A quote should not assume that an unseen sub-base is suitable for the new system.
- Is resin bound over old tarmac different?
- Potentially. DALTEX identifies sound tarmac, asphalt or concrete as possible bases when they are suitable for the traffic, correctly prepared and compatible with the system. Existing cracks and drainage still need assessment.
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