ᐅ Structural Engineering – Shifting a House with a Basement Due to Insulation of Poroton Bricks

Spiderman1982 schrieb:

The construction manager and site supervisor said it is possible to do.

You can… often many things are possible… whether it is the right approach will be clear on the next page, which hasn’t been written yet.
What does the structural engineer say?

11ant schrieb:

We are not familiar with your house design in general, nor with the base details.

It’s just a normal house, nothing special. What kind of base details do you want to know?

Maybe it’s best if I simply stick with 6cm (2.4 inches) as originally planned. Then increase the insulation from WLG 035 to 028, and that should be fine.

Hello,

when simply "moving walls," please keep in mind that the prefabricated floor slabs already ordered will most likely have insufficient bearing surface on the wall. A bearing length of usually 5cm (2 inches) is structurally required here. The precast elements themselves may already be undersized, so a much bigger problem can quickly arise.

Spiderman1982 schrieb:

Just a normal house, nothing special.

“Normal” nowadays unfortunately means that planners don’t think in fixed measurements at all, causing endless issues with poor workmanship, so making any changes usually just makes things worse.

Spiderman1982 schrieb:

What foundation details do you want to know?

The complete foundation detail from the construction plan, even if it’s not quite the same quality as a detailed plan from the architect, without the quotation marks. So the full “zoom” into where walls meet at the bottom and top, ceiling and ceiling support, ground level, perimeter insulation, foundation, splash protection strip, and so on.

Simon-189 schrieb:

Please keep in mind when “just moving walls” that the prefabricated floor slabs already ordered will definitely have insufficient bearing surface on the wall. Typically, 5cm (2 inches) is structurally required here. The precast elements themselves can also have undersized dimensions, so this can quickly become a much bigger problem.

This is an example you see here: ALL the other elements that need to be adjusted due to the change.

Spiderman1982 schrieb:

Maybe it’s best if I just stick to 6cm (2.4 inches) as originally planned. Then increase the insulation from WLG 035 to 028 and that’s fine.

That sounds like at least the path with the fewest complications.

Maybe I should include questions like this in my consulting service portfolio, I just need to come up with a name for it…

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11ant schrieb:

Maybe I should include these kinds of questions in my consulting services portfolio, but I just can’t think of a name for it yet...

I suggest the “House of Cards Effect.” You quickly add a small wall, and everything above it collapses 🤨

Simon-189 schrieb:

Hello,

when simply “moving walls,” please keep in mind that the prefabricated concrete slab panels already ordered will then have insufficient bearing surface on the wall. Usually, a minimum of 5cm (2 inches) is required for structural support. The prefabricated parts themselves may already be undersized, so this can quickly lead to a much bigger problem.

I have to disagree. The precast concrete filigree slabs do not necessarily always need to rest on 5cm (2 inches) everywhere. On my shell construction, I had exactly such a slab panel that did not touch the wall underneath. I sent a photo of this to my structural engineer, who promptly responded that there are constructive measures in such cases to ensure load transfer to the “almost missed” wall. Check the construction wiki under “element slabs – application rules.” There is a great image that explains it very well.
By the way: Our 36.5cm (14½ inches) bricks rest 12cm (5 inches) on the underlying XPS insulation. Whether it “simply works” in the original poster’s case to increase this from 6 to 8cm (2¼ to 3 inches) can only be answered by the structural engineer of that project. And if they approve and the general contractor can still adapt all trades accordingly, a building permit / planning permission should be submitted and implemented as soon as possible.