Concrete filler under floor joist

[cubix]

Do you think it would work to apply concrete filler under floor joists to level them? The base is a concrete slab, but it's very uneven, and the distance between the floor and joist varies between 10-25 mm. I've tried with small pieces of wood, but it's almost impossible to get the right thickness on them.

 

[cubix]

No one who has tried this?

 

[cubix]

See that many have read the thread, but apparently no one with experience or knowledge about this. No forum god online?

 

[magnu]

You can try using plastic wedges
http://www.beijerbygg.se/templates/BB_Produkt.aspx?id=2941

I guess you don't have issues with ground moisture that can seep up through the floor structure!

 

[7956]

Do you think it's possible to use concrete filler under floor joists to level them? The substrate is a concrete slab, but it's very uneven and the distance between the floor-joist varies between 10-25 mm. I've tried with small pieces of wood, but it's almost impossible to get the right thickness on them.

Check at the nearest building supply store or similar for plastic spacers or wedges, spacers are available in 1, 2, 5, and 10 mm, so you can achieve the height you want. I can't remember exactly with wedges, but I think they come in 30, 40, and 50 mm that are "textured" so they lock when you push two against each other until you get the height you want, they work great and are moisture-resistant and dimensionally stable.

 

[cubix]

Ok, I was thinking of wedges from the start, but I thought they might slide apart after a while.
I'll see if I can find some at the hardware store.
Thanks for the help