ᐅ Recess in the screed, 5 cm deep – How is it done?

Hello,
What are the options for creating an opening measuring 60x40x5cm (24x16x2 inches) when installing the screed?
The total thickness of the screed is 15cm (6 inches).
Should I build a wooden formwork of 60x40x15cm (24x16x6 inches), leave out the whole area, and then pour 10cm (4 inches) afterwards?
Or should I use something like Styrofoam in the size 60x40x5cm (24x16x2 inches), have it incorporated during the pour, and remove it later?

How is this usually done?

I am a complete beginner in this area and just want to prepare the necessary tools and materials.

Good luck

Styrodur is your friend

Bernd2378 schrieb:
The total height of the screed is 15cm (6 inches).

Well, rather the height of the entire floor construction.

Bernd2378 schrieb:
What options are there to create a recess measuring 60x40x5cm (24x16x2 inches) when installing the screed?

Counter question: what would be the purpose of that?

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Bookstar schrieb:
Styrodur is your friend

Great, thanks. Then I’ll just prepare the material with the appropriate dimensions and give it to the screed installer.

11ant schrieb:

Counter question: where (or for what) would that make sense?

I wanted to create a small recess in a basement room without underfloor heating where I could place a pump if necessary. My wall outlet is at +15cm (6 inches), and everything is connected to it.
If water should accumulate in the basement, I could then relatively easily pump it out through this depression.
Good idea or not?

Bernd2378 schrieb:
Good idea or not so much?

Only if the water knows it’s supposed to flow into that recess. A slope in the screed? How do you prevent the screed from getting wet as the water (where is it coming from?) makes its way to the recess?

Simply put, the recess is pointless.

nordanney schrieb:
Only if the water knows it should flow into this drainage point. A slope in the screed? How do you prevent the water (where would it come from?) from soaking the screed on its way to the drain?

Simply put, the drain is pointless.

I agree with you. Under normal circumstances, no water should remain on the basement floor.
However, if the washing machine or similar equipment leaks, it’s a different situation.
Would it be possible here to pump most of the water outside using relatively simple methods? (Of course, the rest would have to be dried by other means.)