How to Calculate Binder and Stones for Resin Bound Entrances

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How Much Binder or Pebble Do I Need to Cover My Entrance?

Correctly estimating the right amount of resin binder and pebbles is crucial to a successful resin bound entrance. This guide walks you through the essentials for accurate calculation and a polished finish.

Calculating the Amount of Stones Needed

Begin by measuring the area you wish to cover and decide on the desired thickness of the surface. An efficient formula to estimate the required quantity is:

Stones (kg) = 15 × Area (m²) × Thickness (cm)

For instance, if your entrance is 5m² and you want a 2cm layer, you’d need 150kg of pebbles. Choose a grit size of 4-8mm for optimal drainage and binding strength, similar to those in our Washed Pebbles for Permeable Floors.

How Much Resin Binder to Use

As a general rule, resin binder should make up about 3% of the total stone weight. For 150kg of pebbles, you’ll need approximately 4.5kg of resin. The binder not only adheres the stones but also contributes to the durability and water permeability of your surface.

Product choice is important: use non-yellowing polyurethane binders for white stones, and opt for a clear epoxy like “Trasparente” Epoxy Binder for coloured aggregates, ensuring your entrance maintains its appearance over time.

When This Matters

Getting your calculations right prevents running short of material or over-ordering, which helps you achieve a professional result and avoid unnecessary costs. This process is particularly important for entrances, where high foot traffic and kerb appeal are key factors.

Related guides

Should I Choose Resin Bound Gravel For My Entrance

Accurate material planning ensures your resin bound entrance is both attractive and resilient. For more decisive guidance on choosing the right system for your entrance area, see our main advice at Should I choose resin bound gravel for my entrance?