Incorrect material delivery for in-house work

Hello everyone,

I have a small problem with my construction management company regarding an incorrect material delivery.

The drywall trade was carried out by me as a self-performed task. I had the material delivered by my site management, including insulation wool, battens, adhesive tape, foil, etc. The plan was to insulate the collar beam ceiling and the roof slopes with 20cm WLG 035. However, I was only delivered 18cm WLG 035. I didn’t notice this during installation and only became aware of it after the drywall boards had already been filled and I wanted to file the delivery notes with the contracts. That was certainly a mistake on my part, not checking everything before installation.

Now I have confronted my site manager about it. The good news is, the Kfw70 credit is not at risk; the recalculation of the insulation is still sufficient to meet all requirements. The bad news is, he wants to charge me, as the person performing the trade, the 500 euros additional cost for the recalculation.

Is that acceptable? I am actually not willing to bear these additional costs. On the contrary, I would rather have the reduced material costs and the increased heating costs for the coming years reimbursed to me. I consider tearing out the "wrong" insulation inappropriate and uneconomical. However, I also don’t see why I should be liable for my site manager’s mistake just because I didn’t notice his error.

Am I completely wrong, or how do you see it?

Thanks in advance.

500 € for a recalculation o_O - without changing the geometry or anything - not a bad hourly wage? Unfortunately, my sense of justice won't get you anywhere... difficult situation. Sit down again and talk about it? Have you already communicated your understanding of the situation to the site manager?

Talk to each other to see if anything can still be done. Plot. I see the problem with you, since it is YOUR own work. You received the delivery, did not check it, and installed it. Book it under "bad luck." What if your construction manager offers you an exchange of the wrongly delivered goods? That would be fair, wouldn't it? But you probably wouldn't want that...

There was not yet a kind of round table, which also seems to me the most sensible solution I am aiming for.

I did not commission an architect with the construction management for nothing, and part of the closed contracts is also "Material delivery for trade drywall construction (own work) - 20 cm WLG 035, etc. If he assigns his intern or someone else to the order at the building materials dealer, I do not want to be responsible for that.

And yes, I really would not want to exchange the delivery. I do not think I will tear up all the ceilings again for 2 cm of insulation. The KFW credit is not in danger.

Well, but you should have checked the material after delivery and before installation, even or especially as a private person.

I am not sure if you will come out of this positively at all. At least legally.

I think, indeed, only goodwill helps there.

Morning

I see it the same way as Toxi.
You have completed the work yourself.
So it is also your task to carry out all the work, including checking the building materials.

But I also find the 500 € too high.
Changing a value in the calculation and printing or sending the whole thing by email is quite steep.

Olli