How to Calculate Resin for a Pebble Floor

How the coverage estimate works

The 15 kg per m² per mm figure is a practical bulk density allowance for typical decorative gravel. Multiply your total area in square metres by the desired compacted depth in millimetres, then multiply by 15 to estimate stone weight in kilograms.

Resin is then calculated as roughly 3% of that stone weight. For example, 1.44 m² at 20 mm gives about 432 kg of stones, so 3% is approximately 13 kg of binder.

Practical ordering and mixing tips

For a pebble floor, the binder should be mixed with the stones before laying rather than poured over the surface. This helps achieve full encapsulation and a stable finish.

• Order a small margin above the calculated quantities, especially if the sub-base is uneven.
• Check the manufacturer’s mixing ratio and pot life before starting a batch.
• Use a transparent epoxy binder such as Trasparente when you want the aggregate colour to show clearly.

When this matters

Getting the ratio wrong is most noticeable on larger floors or areas with variable depth. Too little resin can leave loose stones at the surface, while an overly rich mix may affect drainage and appearance. The calculation is especially helpful when working over a concrete base, where the sub-layer is already stable and the stone layer depth is the main variable.