Resin Bound Paving Guide: SUDS-Compliant Aggregate Choice, Primer, Mix Ratios, Depth and UV Stability

Quick Answer: Resin bound paving is a permeable surface formed by mixing 1–6mm dried natural aggregate with a clear UV-stable polyurethane resin (typical mix ratio 80kg aggregate to 6.25–7.5kg resin) and trowelling to 15–18mm depth on a permeable porous asphalt or open-graded concrete base. Done correctly it is SuDS-compliant under the GPDO Class F front-drive rule, lasts 15–20 years, and resists weeds, oil drips and frost damage.

Summary

Resin bound is the rapid-growth product in domestic paving — homeowners like the seamless look, the colour palette, and the absence of weed growth in joints. The product itself is forgiving to install if you stick to the manufacturer's data sheet; the failures are nearly always at the base layer, the resin chemistry, or the weather window.

There are two distinct things called "resin paving" — bound and bonded — and they behave completely differently in regulation, drainage, and longevity. Bonded is impermeable and fails the SuDS test. Bound is permeable and passes. Mixing them up costs jobs.

The market leaders for resin systems are SureSet, Addagrip, Daltex, Resin Mill, and Long Rake Spar (which sells the aggregate). Most product failures in the UK come from one of three causes: cold-weather installation outside the resin's curing window, contaminated or wet aggregate, and applying over a non-permeable base where water builds up at the resin/base interface.

Key Facts

Quick Reference Table

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Aggregate spec Pedestrian Domestic drive Light commercial
Aggregate size 1–3mm 2–5mm or 3–6mm 3–6mm
Resin/aggregate ratio 7.5% 7.5–8% 8–8.5%
Resin coverage ~5kg/m² at 15mm ~6kg/m² at 18mm ~7.5kg/m² at 22mm
Aggregate coverage ~22kg/m² at 15mm ~28kg/m² at 18mm ~34kg/m² at 22mm
Base type Porous concrete or porous asphalt Porous asphalt 50mm Porous asphalt 65mm + binder
Total system thickness ~80mm ~80–100mm ~120mm+
Indicative cost £/m² (2026) £75–£100 £85–£120 £100–£150

Detailed Guidance

Base preparation — where most failures originate

Resin bound is a wear surface, not a structural layer. The base must be permeable, structurally sound, and stable. The two acceptable bases are:

Standard non-permeable concrete or sealed tarmac is unacceptable as a base — water reaches the bond line, can't escape, and freeze-thaw delaminates the resin within 2–3 winters.

A new porous asphalt base must be allowed to cure for 7–14 days before resin application. Older bases must be clean (jet wash and dry), free of bitumen bleed (mask if needed), and structurally sound (tap-test for hollow areas).

Primer application

Primers improve resin-to-base adhesion. Most resin manufacturers recommend their own primer for porous concrete; on porous asphalt, primer is often optional or substituted for a thin scratch coat of resin. Apply at the manufacturer's coverage rate (typically 0.2–0.4 L/m²) and allow to become tacky before the first resin pour.

Don't over-apply — primer pooling shows through as gloss patches in the finished surface.

Mixing and laying technique

Forced-action mixers (e.g. Belle Premier 100, IMER Mortarman) are essential — drum mixers don't coat all aggregate evenly. Standard sequence:

  1. Empty 80kg of aggregate into mixer
  2. Pour mixed resin (Part A + Part B blended for 30 seconds)
  3. Mix for 2–3 minutes until aggregate is uniformly coated, no dry pockets, no resin pooling
  4. Discharge directly into wheelbarrow or onto prepared surface
  5. Spread to depth using a steel trowel, working back from a fixed edge

The trowel is held flat and lubricated frequently — pulling the aggregate into the previous bay's edge as you go. Keep the same person trowelling the whole job for finish consistency. Joins between batches are invisible if the same operator handles both.

The mix has 8–15 minutes from resin pour to set point. Beyond that, it pulls and tears. Plan batches against the area you can spread in that time — typically 4–6m² per 80kg batch.

Aggregate choice — appearance and durability

Aggregate is the visible element. Quartz, granite, marble and recycled glass are the main UK options. Long Rake Spar publishes a range of natural aggregates from £400/tonne (basic) to £1,200/tonne (designer). For a 100m² drive at 18mm, that's 2.8 tonnes of aggregate — so the aggregate decision drives both look and material cost.

Quartz is the most common choice for durability. Decorative marble looks premium but is softer (Mohs 3) and shows wear in driveways within 5 years. Recycled glass is striking in jewel colours but has sharp edges that wear underfoot — fine for borders, not for full driveway.

UV stability and resin chemistry

Aliphatic polyurethane resins are UV-stable; aromatic resins are not and yellow over time. Aliphatic resin costs roughly twice as much. Cheap "starter kits" sometimes use aromatic resin and the colour shift becomes obvious in 12–18 months. Always confirm the resin chemistry with the supplier and ask for a UV-stability data sheet.

Some systems use "hybrid" formulations — partial aliphatic — which slow but don't prevent yellowing. For a quality residential drive, specify 100% aliphatic.

Failure modes and remedies

Maintenance

Resin bound is low-maintenance. Annual jet-wash on a low pressure setting (under 100 bar) clears organic debris from the surface voids and maintains permeability. Resin sealers (clear) can be reapplied every 5–8 years to refresh appearance, though they're not strictly necessary.

Avoid gritting salts in winter — sodium chloride accelerates resin breakdown. Use sand or a non-chloride de-icer.

Frequently Asked Questions

How is resin bound different from resin bonded?

Resin bound is mixed in advance and trowelled at 15–18mm; permeable. Resin bonded is a thin scatter of dry aggregate onto a fresh resin layer (3–6mm total thickness); impermeable, more like a textured paint. Bonded fails GPDO Class F. Bound passes. See resin bonded vs resin bound article for the full comparison.

Can resin bound be laid in winter?

Below 5°C the resin won't cure properly. The realistic UK window is April–October, with extended hours either side if conditions are dry and temperatures rising. Some manufacturers offer "winter resin" formulations that cure to 0°C, but the standard advice is to wait for spring.

How long does it last?

Quality aliphatic systems on a sound permeable base last 15–20 years before needing significant attention. The first failure is usually surface dulling and minor de-bonding at edges, both of which can be addressed with a maintenance overlay rather than full replacement.

Why does my drive look patchy?

Two common causes: (1) inconsistent troweling pressure leading to thicker/thinner zones; (2) batch-to-batch variation in resin/aggregate ratio if measured by volume rather than weight. Both indicate process control issues at install time.

Is resin bound suitable for HGVs?

Not directly — the typical 18mm domestic spec doesn't carry HGV loads. For occasional heavy vehicle access (skips, oil deliveries), specify 22mm depth on a 65mm porous asphalt base over 200mm Type 3 sub-base.

Regulations & Standards