The natural pebbles are rounded due to the deterioration created by water in bed of rivers.
It is a natural process in which the material more brittle breaks, the remaining is blunt and rounded.
The resulting product is therefore a compact material, very durable and with excellent surface finishes.
Other important characteristic is given by the lasting stability, is very resistant to collisions and weather conditions.
It follows that the river pebble doesn’t need any treatment, neither insulating nor waterproofing.