Washout for a driveway? | LawnSite
May 07, 2003· The best way to do it (IMHO) is have the road base spread at least 4" thick and compacted. Then have 1 1/4" minus crushed rock applied over it. You can also have the 1 1/4" dumped without the road base, but it will take some time for the gravel to settle before you have a good driveable surface. But then again, I''ve never seen this "washout".