Brief summary:
- Renovating wooden beams with new joists attached to the sides of the beams.
- Property from 1905
- Insulation building debris, very heavy
- Wooden beams spaced cc40 - cc50 with blind bottom
- Apartment at the top.

Status:
- Everything ready to pour back the old insulation and screw down the chipboard
- Edge against the wall will be a more heat-insulating type.
- Neighbor has developed settling cracks on an original but non-load bearing wall, which runs under the floor I've been working on.
- These have gradually become larger.
- Neighbor wants to hire a craftsman to fix it.
- The old beams sag in the middle of my room by about 3 cm over 5 meters. It's in the middle of this where their wall runs.
- Have had limited time so the work has taken quite a long time.

My concern:
- What causes the cracks? Have been extremely careful.
- Could it be that the floor couldn't "handle" the old insulation? Should one really put back the old insulation then?
- If the neighbor fixes the problems, and if the weight was the issue, isn't there a risk that over time the floor will continue to settle and the neighbor will want to bring in a craftsman repeatedly?

All recommendations and tips from all sides are enormously appreciated!

Thank you,
Christer
 
Difficult to say without being an expert and on-site. It could even be that the cracks are due to it no longer being loaded.

But doesn't it seem reasonable to throw away the old "insulation" consisting of construction debris?
 
What makes you think it's "construction debris"? It's common to have clay, gravel, etc., lying on the subfloor in the joist layer as it was the way to create a heavy and soundproofed floor structure.

So "construction debris" is probably a bit misleading, and switching to a lightweight material like mineral or stone wool will result in more noise between floors.

Then I can agree with Anna_H that it might even be cracks due to the joist layer no longer being loaded.
 
Thanks, wrong word on my part, it consists of clay brick remnants (a lot of brick), plaster remnants, gravel and a bit of that.

The plan was to keep the old insulation but, the eco-fiber 50 cm from the outer wall since it is extremely cold and drafty.

But if I understand you correctly, when it gets loaded, it might settle again. The question is how long it might take before it's time to address the problem.

I understand that it's difficult to assess here on the web, but your help is greatly appreciated.
 
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