posted 14 years ago
In general, I'd be tempted to either wrap the sub-grade part in an epdm liner, or extend the gravel bed for french drain right up the side of the buried portion of the wall to grade. A lot depends on the particulars, though. How's your soil? Do you have enough slope that you can take a french drain from 6' below grade to daylight with relative ease? Can you site the thing out of runoff flow?
Doug