How To Determine Height and Depth of Foundation Wall?

[geno742]

That sounds pretty good Geno.

You have to make sure you build your foundation for the main house BEFORE you add the slab, correct? Or else you'll get a continuous slab around the existing as well as the new addition?

And are you saying you place (for instance) a 12" deep slab under the room addition, add dashed lines to show the interior footing perimeter, then modify it in a section view to show the footing as being deeper than the slab?

For the foundation plan view that will be sent to the layout, show the dashed lines indicating the width of the footing below. I'm assuming this is also a mono-pour like the existing house foundation. I wouldn't mess with the slab. Just make the depth look right for the addition elevations. The section is a separate cad drawing showing the mono-pour foundation as it should look.

I'm just getting the stuff on the con docs to look like they should, not worrying about the model.

I think is is faster to draw a cad detail for the section instead of messing around with the inaccurate section from the Chief generated slab foundation.

For me, it's all about the construction documents

This may be blasphemy here on the Chief site... not caring about the model.