ᐅ Close the opening for the water pipe between floors

Hello everyone,

In our house, insulation will soon be installed before the screed. There is currently a hole for a water pipe, see the image below.
Should the hole be sealed before installing the insulation, and if so, with what material or method?
This concerns the floor (concrete slab) between the ground floor and the basement.

Thank you in advance for your help!

Mathieu91 schrieb:

This concerns the floor (concrete slab) between the ground floor and the basement.

Is the photo rotated? It doesn’t look like a “floor” at the moment.

I simply filled it with expanding foam.

ypg schrieb:

Is the photo rotated? It doesn’t look like a “floor” at the moment.

Yes, the photo is rotated 90 degrees. The white part is the wall.

KingJulien schrieb:

I just filled it with expanding foam.

Is expanding foam airtight and insulating? Does that matter in this case?

Definitely not airtight, but somewhat insulating. Although both probably don't matter much.
The advantage of the hole not being completely sealed: you quickly notice when water is standing on the structural slab at that spot 😉

Uh... Construction foam, or PU foam, has excellent insulation properties—like any material that contains many tiny air bubbles or pockets.