what to fill with???

[imported_peter]

I am going to pour a new layer on my basement floor that I have broken up to reroute the drainage, so the question is what should I fill the hole with? It feels unnecessary to fill the 25 cm deep trench with concrete. Should I fill it with sand or crushed stone??? Or does it maybe not matter? Under the pipes, there is sand...

 

[Mats]

Sand will do fine. You should have sand closest to the pipe and then you can use something that compacts reasonably well, such as more of the sand.

 

[BigBernt]

Consider whether you should tear out the entire floor while you've already made a mess, to take the opportunity to insulate and make a new floor.

 

[norrbottenstorpet]

Consider whether you should rip out the entire floor when you've already made a mess to take the opportunity to insulate and make a new floor.

If the basement is heated, yes, otherwise it's hardly worth it. Usage must dictate this.