How To Determine Height and Depth of Foundation Wall?

[WHirsch]

I just use a custom wall, typically 16" or 18" concrete, linetype to match footings, and placed on the footings layer. If this is an under slab footing or a crawl space strip footing, then raise or lower it in a backclip to the correct top and bottom heights. If it's a perimeter grade beam, it will already be at the correct top height, with the added advantage is that it is possible to place piers under it.