Hi all, brain picking time again, I am going to build ( I HOPE ) a gravel driveway,I know all about getting a good solid base and laying a membrane ( not to sure where to place this ) but I keep getting conflicting information about putting a lean mix of concrete down as a finale base before the gravel goes down, I have seen some that have it and some that don't, one that has it is still looking good after 28 years.All ideas would be very welcome, Reg