Could you please explain to me what the offsets should be for a slab at the bottom of a 4 foot crawl space wall?
I went to floor system and draw - slab. and then put my slab in.
Now, from what I understand, I have to edit the slab and give it an offset. I'm not sure what it should be.
The top of the foundation (C.M.U.) has an elevation of 0'-0". Grade is 12" below that.
The top of the concrete footing which is also the bottom of the 3" slab sits at elevation (negative)-4'-0"
So, would my offset be -3'-9" ? (top of slab to top of foundation wall) Or is it from grade?
Any help explaining offsets in this situation would be greatly appreciated...