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Getting the resin to stone ratio right is key to building attractive, hard-wearing, and permeable outdoor surfaces using Polirock polyurethane binder. Here’s what you need to know before you start your project.
Why the Correct Ratio Matters
Using the ideal amount of resin ensures your stone-bound surface is strong, stable, and drains water effectively. Too little resin can result in weak or loose stones, while too much may affect drainage and increase surface sheen undesirably.
- 3% resin to stone by weight is the general guideline for Polirock, providing reliable adhesion and weather resistance.
- Best results are achieved with stone sizes between 4-8mm.
Mixing and Application Tips
Always weigh your pebbles and calculate the resin required based on the 3% rule. For example, mixing 100kg of stone means using 3kg of Polirock resin. Blend the resin thoroughly with thoroughly dried, clean pebbles for consistent coverage. White or light stones, like those in the Washed Pebbles for Permeable Floors, particularly benefit from Polirock’s clear, non-yellowing formula.
Always follow the instructions on the resin kit to adjust for any product-specific recommendations.
When This Matters Most
Precise resin to stone ratios are especially important for surfaces exposed to frequent rain, pedestrian use, or where a decorative finish matters. This ensures the bond holds up against the elements while preserving the natural look of white or bright aggregates.
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Understanding the correct Polirock resin to stone ratio is essential for achieving durable, permeable, and visually appealing outdoor areas. For more insights into how these systems function, visit the main guide on how permeable paving works.