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
Sporttasche2 Oct 2020 11:45This is how it looks. At the back where the men are standing and where the bay window is, as well as along the long section, 16cm (6.3 inches) was cut off.
S
Sparfuchs772 Oct 2020 12:33Müllerin schrieb:
The foundation can’t be inspected anymore now that the slab is in place... Of course... just grab a shovel and take a look.
S
Selbstbau2 Oct 2020 12:57Well, I don’t see the situation as straightforward as your site manager does. Steel reinforcement cages were installed all around with the necessary reinforcement, and now that 16 cm (6 inches) has been separated, the reinforcement is missing, isn’t it? Maybe you should discuss this with your site manager?
Simply cutting something like that is definitely not acceptable, as a slab foundation is neither uniformly thick nor consistently reinforced throughout. When using an angle grinder (*LOL* – no, honestly, almost *ROTFL*), the reinforcement doesn’t just retract to maintain the concrete cover on the side. And if I then imagine that the Smurfs took the "easier" side to cut (which unfortunately was the correct one), now the house is actually positioned 16cm (6 inches) off from where it should be. I really hope your watch is six months slow and you’re playing an April Fool's joke on us.
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