Mid-atlantic foundations

[sdarch]

This is how slab houses are built in the Mid-atlantic region. This was done by creating 3-d solids, one on top of another. It was a a pain to create, and leaves a lot of unnecessary linework on plan view. Why can't Chief create this condition as easily as it creates a crawl space.   Or can it?

[mtldesigns]

1 hour ago, sdarch said:

 Or can it?

It kind a can.  I never figured out how to do the insulation between the slab and the header block in the program.  But you can always do a molding around the perimeter and set to be flush w slab.  Thats the only way I know how to do this..

 

You have 8" CMU, so after you create the foundation, go to the wall dbx and make the lower 8" a pony, add a 4" wall type at the top at -4" (slab thickness).  The floor structure dbx just add the rigid insul under the slab.  I usually just show the insul in a detail with a poly solid.

 

 

 

 

Edited August 17 by mtldesigns
grammar

[mtldesigns]

here is that model for reference.

test cmu.plan

[sdarch]

THANKS, I'LL TRY THAT. LOOKS LIKE YOU HAVE TO ERASE THE LINE 4" DOWN BUT THATS NOT BAD. I TAKE IT THE  BLUE IS THE SAND FILL. 

BUT I DO LIKE THE CLEAN FOUNDATION PLAN.

[mtldesigns]

3 hours ago, sdarch said:

I TAKE IT THE  BLUE IS THE SAND FILL

That blue is to represent the foam insulation you had shown in your model. 

[sdarch]

On 8/17/2025 at 9:11 PM, mtldesigns said:

That blue is to represent the foam insulation you had shown in your model. 

Actually it is 24" of insul. 4" vert. and 20" horiz. 2" thk.

[sdarch]

On 8/17/2025 at 5:44 PM, mtldesigns said:

here is that model for reference.

test cmu.plan 5.81 MB · 5 downloads

At first I had problems with the coursing of the block in rendering view. you have to ignore the instruction to include the thickness (1.5") of the plate and just call the stem wall 16" or you will get a 1.5" base course. This seems to be a workable solution to a problem i have been having for quite a while. It just requires erasing the line separating the 4" and 8" walls and  drawing in the 20"x2" foam insulation under the slab. (In section view) Problem solved). Thanks.

[mtldesigns]

17 minutes ago, sdarch said:

Thanks.

Your welcome.  In a detail showing that 2" x 20" foam insul will be easy, however if you wanted to show in the model, where all your section views will show it, you can do a custom molding and set it below the slab.  I updated that test model.

519850850_testcmu.plan

Edited August 25 by mtldesigns