ᐅ Concrete slab poured too large – it has now been cut down – is this acceptable?
Created on: 1 Oct 2020 09:22
S
Sporttasche
Hello dear experts,
We are just at the beginning of our build, and already the first issue has occurred. The concrete slab was poured too large! It’s actually surprising how something like this can happen, but it did (by the way, the slab was done by a very well-known company).
The slab is 16 cm (6.3 inches) too long on one side, and this also affects a recess for the bay window.
This was noticed during the slab inspection. We were told that it can happen (which was visibly embarrassing for the site manager) and that they would fix it. Yesterday, the slab was "cut back" by the mentioned 16 cm (6.3 inches). They used a type of cutting disc similar to those used in road construction to grind the slab. Since the slab is much thicker than the cutting depth of the disc, the rest was painstakingly removed with a pneumatic hammer. The area was then re-plastered.
Well, apparently everything is fine now, which I really hope is true. I am not an expert, so I would like to hear the opinions of professionals here.
In my view, it can’t be as good as if it had been poured correctly. Here, a component was opened up and patched. The frost protection edge (frost skirt) that was originally 50 cm (20 inches) is now only 34 cm (13 inches) high (they say a maximum of 20 cm (8 inches) is needed and that it’s always 50 cm (20 inches) because the excavator’s bucket makes 50 cm (20 inches) wide trenches).
I’m already upset that the build started like this and I really hope we won’t have problems because of it down the line.
Which expert can give me some advice on this topic? Thank you!
P.S. By the way, it’s a KFW40+ house with a matching slab.
We are just at the beginning of our build, and already the first issue has occurred. The concrete slab was poured too large! It’s actually surprising how something like this can happen, but it did (by the way, the slab was done by a very well-known company).
The slab is 16 cm (6.3 inches) too long on one side, and this also affects a recess for the bay window.
This was noticed during the slab inspection. We were told that it can happen (which was visibly embarrassing for the site manager) and that they would fix it. Yesterday, the slab was "cut back" by the mentioned 16 cm (6.3 inches). They used a type of cutting disc similar to those used in road construction to grind the slab. Since the slab is much thicker than the cutting depth of the disc, the rest was painstakingly removed with a pneumatic hammer. The area was then re-plastered.
Well, apparently everything is fine now, which I really hope is true. I am not an expert, so I would like to hear the opinions of professionals here.
In my view, it can’t be as good as if it had been poured correctly. Here, a component was opened up and patched. The frost protection edge (frost skirt) that was originally 50 cm (20 inches) is now only 34 cm (13 inches) high (they say a maximum of 20 cm (8 inches) is needed and that it’s always 50 cm (20 inches) because the excavator’s bucket makes 50 cm (20 inches) wide trenches).
I’m already upset that the build started like this and I really hope we won’t have problems because of it down the line.
Which expert can give me some advice on this topic? Thank you!
P.S. By the way, it’s a KFW40+ house with a matching slab.
S
Sparfuchs772 Oct 2020 14:40For me, there is only one way to proceed:
1. Stop construction
2. Grab a spade and expose the foundation (a meter wide (3 feet) is enough)
3. Call in a structural engineer to inspect the slab and foundation
4.1 If the structural engineer gives a written OK, the issue is resolved for me
4.2 If the structural engineer gives a written NOT OK, write a defect report and set a suitable repair plan plus deadline
Steps 1-3 should ideally be done in the presence of the construction company manager. In case of 4.2, you will probably need an expert witness.
This is how I would do it (and had to do it myself, as our foundations were not deep enough and, as a result of the defect report, had to be underpinned all around).
1. Stop construction
2. Grab a spade and expose the foundation (a meter wide (3 feet) is enough)
3. Call in a structural engineer to inspect the slab and foundation
4.1 If the structural engineer gives a written OK, the issue is resolved for me
4.2 If the structural engineer gives a written NOT OK, write a defect report and set a suitable repair plan plus deadline
Steps 1-3 should ideally be done in the presence of the construction company manager. In case of 4.2, you will probably need an expert witness.
This is how I would do it (and had to do it myself, as our foundations were not deep enough and, as a result of the defect report, had to be underpinned all around).
S
Sporttasche2 Oct 2020 18:20Unfortunately, this is not an April Fool’s joke.
S
Sporttasche2 Oct 2020 18:22S
Sporttasche2 Oct 2020 18:26So it is now "finished".
S
Sporttasche2 Oct 2020 19:10Good question what the structural engineer says...
The black part is primer.
The black part is primer.
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