Aggregate Compatibility for Permeable Courtyard Resin Floors

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Aggregate Compatibility for Permeable Resin Courtyards

Choosing the right combination of resin and aggregate is key to achieving a durable, attractive, and fully permeable courtyard surface. Not all resins suit every stone, so understanding compatibility helps you avoid discolouration, weak bonding, or drainage issues.

Matching Resin Types to Aggregate Colour and Finish

The colour and type of aggregate you select will influence which resin binder is ideal. For white or very pale stones—such as Carrara marble or other light granules—a non-yellowing polyurethane resin is generally preferred, helping maintain the pristine appearance over time. For coloured, warm, or dark aggregates, a clear epoxy resin offers strong bonding and resistance to yellowing. Always avoid using standard epoxy binders with white stones, as even low-yellowing formulas may cause slight colouring shifts over time.

Recommended Stone to Resin Ratios

Correct resin dosage is essential for both strength and drainage. When working with coloured aggregates and an epoxy binder, a typical mix is about 3% resin by aggregate weight. For example, you might use 800g of resin for 20–25kg of granules sized 1–2mm. Ensure that the aggregate is thoroughly mixed with the resin before laying, which guarantees full encapsulation and stability across the finished surface.

For white aggregates: Use non-yellowing polyurethane resin.
For coloured or dark aggregates: Use a clear epoxy resin at recommended ratios.

When Aggregate Compatibility Matters

Ensuring resin and stone compatibility is especially important for maintaining surface appearance and mechanical integrity. This matters most in visible courtyards, driveways, and areas with regular foot or light vehicle traffic, where aesthetics and longevity both count.

Related guides

Which Resin Should I Use For A Permeable Courtyard

By understanding aggregate and resin compatibility, you can create a permeable courtyard surface that is both attractive and long-lasting. For a complete solution, explore the Flowstone kit and other resin options that fit your chosen aggregate. Find more guidance on suitable resins for permeable courtyards on our main advice page.