How do I calculate amount of resin and pebbles needed?

Understanding Coverage Rates

All reputable resin and pebble products provide guidance on coverage rates—typically based on the surface area and intended thickness. For example, creating a 20mm thick permeable pebble floor might require approximately 30kg of pebbles and 1kg of resin binder per square metre. Always check your specific product guide or kit instructions, as variations exist based on resin type, pebble size, and laying surface.

How to Work Out Your Material Needs

• 1. Measure the area in square metres (length × width).
• 2. Decide on the planned thickness (commonly 15-20mm for most outdoor applications).
• 3. Refer to your chosen product or kit guide for the recommended amounts of pebbles and resin per m² at your selected thickness.
• 4. Multiply the recommended quantities by your total area to get the amount needed for both pebbles and resin binder.

For example, for 1.44 m² at 20mm thickness, expect to use roughly 43kg of stones and 1.3kg of binder resin. Kits such as the “Flowstone” Complete Permeable Floor Kit offer size options calculated to meet standard surface requirements, making estimation easier.

Practical Tips Before You Order

• Order slightly more material than calculated to allow for edge shaping or uneven surfaces.
• Always use the appropriate resin type for your chosen aggregate—for example, non-yellowing polyurethane resin for white pebbles, and UV-resistant epoxy for coloured or dark aggregates.
• Mix all binder and aggregate thoroughly as guided—this ensures even coverage and lasting stability.