ᐅ Is the foundation slab planned to be too deep?

Created on: 9 Mar 2019 16:29
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M4rvin
Hi everyone,
I was at the construction site today and was a bit surprised at how deep our house is set... maybe the site is playing tricks on me, but I looked it up and most houses have the finished floor level about 30cm (12 inches) above ground level.

If the slab is really too low, that would explain why we have so much excavation. (The architect said during planning that there wouldn’t be much excavation and it could be spread on the property.)

Regards,
Marvin

Baustelle mit halbfertiger Wand aus weißen Steinen, zwei Arbeiter, Kranhaken, rote Generatorbox.


Baustelle mit zwei Arbeitern in Gelb an einer weißen Porenbetonwand; rechts Großgerät und pinke Dämmplatten.
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Zaba12
9 Mar 2019 17:24
M4rvin schrieb:
It’s hard to tell, but I would estimate the finished concrete slab is about 20-30cm (8-12 inches) lower than the curb edge. Then there’s the screed on top, but I’m probably still below ground level. Even if the slab is flush with the drain, it would be nearly impossible to create a slope away from the house, or am I mistaken?

If it were any lower, it would already be too late. That ship has sailed. Your site manager should use the leveling tool to check the height and tell you the finished floor level. You can then calculate the rest yourself based on the planned floor build-up.
M4rvin9 Mar 2019 18:01
Yes, you’re right...
I can remove another 200 tons of soil from the plot to get it reasonably level!
M4rvin9 Mar 2019 19:32
Just theoretically, if it really turned out to be too deep, what options would we have then?
So, can the general contractor be concerned about additional costs in that case?
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Zaba12
9 Mar 2019 19:41
If the general contractor followed the specifications set by the architect that you approved (for example, the drain height) with a deviation of plus or minus a few centimeters (inches), then no problem.

But as I said, stay relaxed—30cm (12 inches) minus the floor build-up is nothing. In the best case, you are even at ground level and don’t need a raised platform.
M4rvin9 Mar 2019 21:04
I wouldn't have a problem with it being at ground level, but if it were deeper and the whole mess flowed into the house!
seat8810 Mar 2019 07:45
M4rvin schrieb:
It's hard to see, but I would estimate the slab foundation is about 20-30cm (8-12 inches) lower than the curb edge. Then there will be screed applied on top, but I’m pretty sure it will still be below ground level. Even if the slab is flush with the drain cover, it seems nearly impossible to create a slope away from the house there, or am I mistaken?

Your sewer pipe doesn’t end right at the top of the drain cover, does it... but rather inside the manhole, possibly 2m (6.5 ft) deep.