[71-LS6]

Mark, if your builder's concrete man is any good, a 4" curb is a no brainer. My guys would charge maybe $200 at most and that would be all labor. You're right about water wicking up framed walls with sheetrock. If you are worried about rot, simply use treated lumber and water-board for the wall, stay away from any plastic vapor barrier behind the rock, you want it to be able to dry out after you've soaked it down with your garden hose.