How Much Aggregate Do I Need per Kilogram of Binder?

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Ensuring the correct ratio of aggregate to resin binder is essential for the durability, permeability, and appearance of your resin-bound terrace or outdoor surface. This guide will help you determine the ideal aggregate quantity for each kilogram of binder, providing a solid foundation for successful installation.

Recommended Aggregate to Binder Ratio

For the Polirock polyurethane binder, a good starting point is to use between 6 and 8 kg of stone aggregate for every 1 kg of binder. This guideline ensures thorough coating of each pebble for maximum adhesion and structural strength. The ratio can be slightly adjusted depending on the size of the stones you select and the planned thickness of your surface layer.

• Smaller stones may require toward the lower end of the range.
• Larger stones or thicker layers benefit from a higher aggregate content, so consider closer to 8 kg per 1 kg.

Practical Tips for Mixing and Application

Begin by weighing your aggregate and binder separately before combining. For consistent results, mix thoroughly to ensure every stone is evenly coated with resin. Use the prepared mixture promptly to ensure optimal workability, and consider using a cement mixer for larger batches. If you’d like an all-in-one solution, the Flowstone Complete Permeable Floor Kit provides pre-matched ratios and step-by-step application guidance.

When Getting the Ratio Right Matters

Correct aggregate-to-binder proportion is crucial for both the strength and water permeability of your surface. Adding too much binder can leave the finish glossy or less permeable, while excess aggregate may weaken bonding and shorten the life of your terrace. Sticking to the recommended balance ensures your permeable kit performs as intended, especially in areas exposed to weather and frequent foot traffic.

Related products

• "Polirock" – Polyurethane Binder for White Stones, 2kg Two-Component Kit
• Washed Pebbles for Permeable Floors 25kg – Outdoor Resin-Bound Surfaces
• "Flowstone" – Complete Permeable Floor Kit with Pebbles and Resin

Related guides

• Which Permeable Kit Should I Use For Terraces

By following the right aggregate to binder ratio, you set the stage for a resilient and attractive permeable terrace. For more advice on selecting the best kit for your outdoor project, return to our main guide on which permeable kit to use for terraces.