Which Grade of Limestone Is Right for Your Needs? | Port ...
Mar 19, 2018· Beneath a top layer, various grades of limestone form excellent driveway foundations. A large grade, like our #2 ½ OG fills the base; Next, pack on a layer of #57G; Finish off the driveway with a finer grade #8G limestone. Loosetop Driveways. Whether used as an aesthetic choice or affordable one, there are several options in color and size.