ᐅ Do exterior walls need to be positioned exactly in the center of the strip footing?

Hello, since I am new here, I’m not sure if this question is posted in the right place, but I’ll give it a try.

We are currently waiting for a prefabricated house, for which we are doing the basement and the foundation slab ourselves, or with other companies than the house supplier.

Now I have a question about the foundations and the walls that will later be on top of them. I have seen some pictures online where the basement walls sit directly in the middle of the strip foundation, so there is a protruding edge all around.
With a 50cm (20 inch) wide foundation and a 24cm (9.5 inch) basement wall, this means the outer edge of the foundation protrudes about 13cm (5 inches) all around. Our earthwork contractor has now prepared the foundation formwork so that the basement walls will align exactly with the edge of the foundation. So I have a 50cm (20 inch) wide strip foundation where the 24cm (9.5 inch) basement walls will sit directly on the outer edge, and the remaining 26cm (10 inches) of the foundation will basically be inside the house.
Since the foundation and the slab are heavily reinforced and poured together, there should be no risk of tipping, cracking, or anything similar.
The strip foundation is 50cm (20 inch) wide and correspondingly deep. Under the load-bearing walls, there are also deeper foundation strips positioned centrally beneath the walls, and the rest of the slab is about 15cm (6 inch) thick.

Is this an acceptable way to do it, or what is your opinion?

I know that a structural engineer can calculate this best, but before commissioning a paid consultation, I wanted to ask generally what is considered “standard practice” in construction.

I hope you can help me or provide some clarity.

Hello

Leaving the foundation exposed would only make sense if brick cladding is going to be installed on it.

Steven

The structural analysis should provide the answer. If you have serious concerns, hire a certified expert.

The basement walls will be surrounded by soil on three sides, so there will be no brick facing here, only external insulation.
I mainly want to know if there are general guidelines for strip foundations, or if there aren’t any.
For slab-on-grade foundations without a basement, I know that for this prefab house manufacturer they usually have no projection, but align flush with the exterior wall.
For foundations used, for example, for freestanding garden walls, a central placement with overhangs on the right and left side also obviously makes sense, but what about the type of construction I described?

Steven schrieb:
Hello

allowing the foundation to protrude would only make sense if facing bricks are to be installed.

Steven

That’s not the case – as I know it, the slab extends beyond the wall, with a fillet and then insulation applied.

In my case, part of a wall was exposed, but not all the way down. Why strip footings? Or is the slab exposed on one side, like on a sloped lot?

It is a sloped plot of land, and on one side it is completely open, where we also drive into the garage. On the other three sides, the basement wall is built into the ground.