woods89
WKR
Soils are different in different areas, and I can't speak to your area, but in my area I'd consider this a terrible idea.Seriously though update:
Builder told her to go with a block wall basement to save money.
Yes, generally any basement wall has to be waterproofed. A lot of folks use foundation tar, but I personally would probably want a membrane of some type. In my area it's just as important to have drain tile bedded in clean gravel at the bottom of the wall on the outside daylighted out. ( Almost all basements in my area are walkouts)
I know my brother in law who's a custom home builder in western Kentucky usually has block laid for crawlspace foundation walls, and that works fine there, but if he's building on a basement it's ICF.
In my area almost all foundation or basement walls are poured concrete wall.




