Basement construction

Hello,

do you mean a basement that protrudes 50cm above the ground?

It is the same on three sides of our house – on the fourth side, we have a basement wall standing "in the open" from 50cm to 150cm.

For us, this did not cause major extra costs or save money.

For the freestanding base, we saved on the studded membrane, but we need plaster instead.

The insulation is almost the same everywhere – only the part that protrudes from the ground is insulated with white Styrodur, the part "hidden" in the ground is insulated with blue Styrodur.

Regards,

Dirk

Yes, exactly. We want to bring light into the basement through the windows and also avoid pumping out groundwater during excavation. Doesn’t this save those 50cm of excavation? On the other hand, you have to build a small front entrance staircase, and the terrace could be filled up with excavation material...

Yes, you then have 50 cm less excavation, that's true.

Do you already have a soil survey? It usually also contains recommendations for the foundation - depending on that, you may have to add a more or less thick layer of gravel under the basement (and accordingly excavate deeper) to protect yourself against the groundwater.

Whether you can use the excavation to raise the terrace should also be revealed to you by the soil survey.

Not all soil types are compactable and therefore suitable as a terrace substructure.

Gravel does not protect against groundwater ;)

Why do you need a [Weiße Wanne] at 5m groundwater depth? You only need it with pressing groundwater or standing layer water.

We do not have a soil survey yet and we don’t know if it’s worth it. The neighbors on the left and right have soil class 3, no rock or the like in our latitudes. Slightly loamy, but that’s it. Since the rainy seasons have become increasingly extreme in recent years, many in the village without WW had groundwater in their basements. Meanwhile, we have pressing groundwater after prolonged rain. Therefore, a white tank. However, we are increasingly leaning towards a raised basement, because we don’t want to use the basement just as a basement and natural light through windows is already a big argument (for us). The neighbor on the right has built a raised basement, about 70 cm protruding above ground. Maybe I should talk to him.

Gravel does not protect against groundwater ;)

True, I had expressed myself incorrectly there.

Thanks for the correction!