I've got a interesting need here and have been brainstorming ideas for a week with not luck.
Here's the situation.
I have some older clients that will be building a new home. They are really concerned about accessibility as they age. The house will have a full basement as is common here in Utah and will also be utilizing 18-24" deep floor trusses so we can get all the duct work hidden in the floor cavity. This leaves us with at least 3-4 steps plus landing at every entrance to the house and possibly more if we take the riser height down so steps are easier in the future.
The builder and I have the idea of pouring 9-10 foot foundation walls and having a recessed ledge for the floor framing to sit on. The floor sheeting would extend over the remaining 4" of foundation with a single plate below. This will likely require two sets of anchor bolts and sill plate as well but will get us where they only have 6 inches or so from final grade to floor height.
Here's where I need some out of the box thinking. I can draw the floor system with only a plate and sheeting. I can line draw the detail to show how this is going together. I would really like it to look correct in a cross section and am struggling a little with that one. Basically what I need is a cross opening with only 4" width so it leaves half the width at full height and half with the lower ledge I need.
Anyone have any ideas? I'm a little stumped right now
Sam