Since there are no perimeter curtains on the 2nd basement floor, the floor is not considered rigid. In its settings, it says -2 in front of the 2nd basement floor. Therefore, the upper rigid floor number must be entered -3. You can reduce it if the foundation provides less height."lokmanaga":36q2hqa9" said:There are 2 basement floors, but the rigid basement floor number should be -3 and the height of the raft on the ground is not high, e.g. Isn't the floor not high