If you’ve ever priced a job, picked a colour, then paused at the last moment thinking “which size resin bound aggregates are we using here?”, you’re not alone. Aggregate size affects how the job handles on the day, the look of the finish, and how smoothly you can keep the workflow moving.
This guide is written for UK resin bound installers who want a practical way to choose between 1–3mm and 2–5mm resin bound aggregates. It’s not about hard rules or sweeping claims. It’s about making a sensible choice based on the site, the finish you’re aiming for, and how to avoid avoidable headaches.
For aggregate options, you can browse Durabound’s resin bound aggregates here: https://www.duraboundltd.co.uk/product-catego…gregates/
And if you’re planning quantities, the resin calculator is a quick way to sense-check materials: https://www.duraboundltd.co.uk/resin-calculator/
Quick Answer
- 1–3mm resin bound aggregate is typically chosen when you want a tighter, more refined finish and you’re working in areas where detail matters.
- 2–5mm resin bound aggregate is typically chosen when you want a more textured, classic resin bound finish and you’re covering larger, open areas.
On many jobs, installers will use a blend approach (or choose a system that includes both sizes) depending on the look and performance they’re aiming for.
If you want to browse pre-blended options, start here: https://www.duraboundltd.co.uk/product-catego…ds-mixes/
Why Resin Bound Aggregate Size Matters on Jobs
Aggregate size isn’t just a visual preference. It changes how the mix feels under the trowel, how the surface reads from a distance, and how forgiving the job is when you’ve got awkward edges, tight timings, or a site that isn’t perfectly straightforward.
It also influences how you explain the finish to a customer. A homeowner might only be thinking about colour, but installers know the finish is a combination of colour, grading, and consistency of materials.
This is why it’s worth having a simple decision method, rather than treating it as a last-minute choice.
When 1–3mm Resin Bound Aggregate Tends to Work Best
In general, 1–3mm resin bound aggregates suit jobs where you want a tighter-looking finish and a bit more visual refinement.
You’ll often see 1–3mm chosen for:
- smaller areas where the finish is viewed up close (entrances, paths, steps and detailed sections)
- projects where the client wants a cleaner, more “modern” look
- areas where you want the stone to look more compact and consistent
From a practical point of view, the tighter grading can be helpful on detail-heavy installs where you’re aiming for a crisp, tidy finish.
Browse 1–3mm options in the aggregates category: https://www.duraboundltd.co.uk/product-catego…gregates/
When 2–5mm Resin Bound Aggregate Tends to Work Best
2–5mm resin bound aggregates are a popular choice for larger areas and jobs where the aim is a classic resin bound driveway finish with a bit more texture.
Installers often choose 2–5mm for:
- driveways and larger open areas
- jobs where you want the surface to read as “stone” from a distance
- sites where you want a slightly more textured finish visually
It’s also a common choice when you’re planning bigger pours and want a consistent, repeatable workflow across a larger area.
Browse 2–5mm options here: https://www.duraboundltd.co.uk/product-catego…gregates/
How to Choose: a Practical Checklist
If you want a simple way to decide without turning it into a debate on every quote, run through these questions.
1) What’s the area and how will it be viewed?
If it’s a small area that people see up close, a tighter-looking finish is often preferred. If it’s a wide driveway or open space, the classic look often suits.
2) How much edge detail and cutting-in is there?
More edges, curves and awkward details usually means you want a choice that helps you maintain a neat finish without fighting the material.
3) What finish is the client expecting?
Some clients want “sleek and modern”. Others want “natural stone texture”. You can often guide the decision by showing two comparable samples and letting the client react.
4) Are you matching or extending an existing surface?
If you’re tying into an existing resin bound surface, matching the grading is often as important as matching the colour.
5) Are you using a blended mix?
Many installers prefer pre-blended options because it reduces decision fatigue and keeps ordering simpler.
If you want to go down the blended route, browse blends/mixes here: https://www.duraboundltd.co.uk/product-catego…ds-mixes/
Avoiding Common Mistakes
The biggest waste on aggregate selection is not the “wrong” size. It’s the knock-on effect of choosing late, ordering in a rush, or not planning the quantities properly.
A few practical habits help:
- Decide your aggregate size early in the quote stage, not the day before the install
- Keep the job consistent unless you’ve planned a deliberate variation (e.g., border)
- Sense-check quantities before ordering (especially on odd shapes and borders)
If you want a quick check for quantities, use the resin calculator: https://www.duraboundltd.co.uk/resin-calculator/
Choose your Resin Bound Aggregates
If you want to keep jobs smooth through the busy months, choosing your aggregate size early helps. It keeps your quote cleaner, your ordering simpler, and your install day less stressful.
Browse resin bound aggregates here: https://www.duraboundltd.co.uk/product-catego…gregates/
And if you’re planning quantities, run a quick check here: https://www.duraboundltd.co.uk/resin-calculator/