What Factors Affect Resin Per Square Metre for Outdoor Pebble Surfaces?

Aggregate Size and Its Importance

The size of the pebbles directly impacts how much resin you’ll need. Larger stones require less binder per kilogram of aggregate since they have less surface area per weight, while finer pebbles need more resin to fully encapsulate each granule. Make sure to follow product recommendations based on your selected pebble size, and mix thoroughly to coat all stones evenly.

Mixing Ratio and Layer Thickness

Your chosen mixing ratio of resin to stone, and the intended thickness of the floor, are crucial. Most manufacturers provide indicative ratios—for example, around 400–800g of resin per 20–25kg of aggregate—depending on pebble size and application. Thicker layers generally require more resin, but too much can make a surface overly hard or less permeable. Consult the instructions for the Flowstone kit to match quantities to your specific surface area and finish.

Practical Tips for Outdoor Application

• Choose the correct type of binder: polyurethane for white or light stones, and UV-stable epoxy such as the Trasparente epoxy binder for coloured or darker aggregates.
• Mix resin with clean, dry aggregates before spreading for even coverage and stability.
• Always work within recommended climatic conditions—avoid extremes of temperature or humidity, as these may affect curing and strength.