1″ Crushed Rock
is an unwashed and fractured rock 15mm in size. Being unwashed, it still contains rock fines.
Used around house ( decorative 4” deep ).
Used for acreage roads, roadways & driveways
2” on top of 6” base gravel not 4” itself because its too loose and you’ll get stuck
Placed around weeping tile.
Used for drainage (Dutch well, French canal).