How Much Resin & Stones for Permeable Paving?

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What Quantities of Resin and Stones Do I Need?

Selecting the right quantities of resin binder and stones is key to a successful and even permeable paving installation. This guide breaks down how to estimate what you need for your project, so you can get started with confidence.

Calculating Quantities for Your Surface Area

To work out how much material you’ll need, measure the area (in square metres) and decide on your required depth—commonly around 20 mm for footpaths and light driveways. For a standard 3% resin-to-stone weight ratio, you’ll typically require about 432 kg of stones and 13 kg of resin binder to cover 1.44 m² at 20 mm depth. Adjust the quantities proportionally to fit your total surface area.

Measure the length × width for total m²
Choose the desired thickness (usually 20 mm)
Apply the 3% resin-to-stone ratio to your total mix (calculated by weight)

Practical Mixing and Application Tips

Both kits and individual binder tubs come with detailed mixing guidance, but here are some simple tips: mix the stones thoroughly with the resin to ensure an even, fully bonded result. For areas above a few square metres, using a cement mixer makes the process much easier and more consistent. Be sure to follow working time recommendations, spreading the mix before it starts to thicken.
For ready-matched kits designed for British weather, the Flowstone Complete Permeable Floor Kit is a reliable all-in-one option.

When This Matters

Estimating the right amounts matters most on larger projects or when ordering aggregates and resins in advance, as under-ordering or wastage can delay your work. Calculating precise quantities helps you avoid extra trips and ensures a seamless finish over the entire area.

Related guides

What Resin Should I Buy For Permeable Paving

Getting your material quantities right sets the foundation for an attractive, reliably draining resin-bound surface. For more advice on choosing the proper resin for permeable paving, see our in-depth guide on the topic.