Elevator Pit Problem

[isbandam]

Hello. While modeling the elevator pit, as explained in the forum, I defined the slab edge by giving 1 cm gap to the outer edges of the curtains, then I created the foundation by giving the raft floor elevation, and I gave the curtains a negative level. How should our approach be? Should we increase the 1 cm space we left? When we increase it, inner consoles are formed on the upper raft. waiting for your comments.