Laying gravel over an existing surface | Pavingexpert
Whenever a small, loose, rounded or subrounded gravel is placed on top of a hard surface, we get what we call the quot;Ball Bearing Effectquot; the individual stones that make up the gravel act just as would ball bearings or marbles on the kitchen floor: they move; they shift when a load is imposed upon them; they travel; and they usually end up sending someone to the local Aamp;E Department.