Slab main floor on top of ICF foundation

[MN_JohnH]

I am wondering how I would set up my main floor to be like this picture, ICF foundation walls with slab floor sitting partially on top of the ICF but inside the main floor wall framing. The double treated sill plate is total 3" thick so the bottom of the 4" slab goes 1" below the top of the ICF wall.
Can this be set up or do I just have do do it with a CAD detail?

[tundra_dweller]

You just have to adjust your floor heights accordingly, and you'll probably get a message about a negative ceiling height in the foundation that you can ignore. Also changing to 3 bottom plates in you ext wall main layer, and adding your 4" insulation to the foundation floor structure. And there'll be some CAD work for the cross section but nothing too major.

 

Here's a sample plan with how I was able to do it.

MNJohn.zip

[MN_JohnH]

12 hours ago, tundra_dweller said:

You just have to adjust your floor heights accordingly, and you'll probably get a message about a negative ceiling height in the foundation that you can ignore. Also changing to 3 bottom plates in you ext wall main layer, and adding your 4" insulation to the foundation floor structure. And there'll be some CAD work for the cross section but nothing too major.

 

Here's a sample plan with how I was able to do it.

MNJohn.zip 654.34 kB · 17 downloads

Thanks Sir, this is awesome. I am studying it to figure out exactly what you did but this is great, I really didn't think it could be done.

[tundra_dweller]

You betcha. Here's a step-by-step.

 

In your foundation defaults, set your slab to be at top of stem wall.

 

In your exterior wall type definition set the main layer to have 3 bottom plates.

 

In your auto-built foundation room DBX set floor-to-SWT to -3" and ceiling to -3". Note that in the plan I attached earlier, I didn't change the ceiling to -3", so it caused the floor to move up to 3" elevation instead of 0". The detail where the slab meets the ICF is the same, but setting the ceiling to -3" forces the top of the slab to stay at 0" elevation.

 

Open up your floor structure for the foundation room and add a layer of rigid insulation below the slab.

 

Edited February 14 by tundra_dweller