1. head room : the program said the headroom clearance is 80" but starting from the surface of the landing. The thickness of landing is 12" , that is to say the clearance is only 80" -12" = 68"= 5' 8" . Does that make sense? I do not worry about the demo case. Just in case we will be in the situation as the Dorf's video shows that people needs to passing through under the landing.
2. the width of staris: the program said the stairs min width is 44" , while the passing solution shows 60" . is 60" the suggested solution ? to keep the relationship between stairs and landing the simple and easy ?