Hello!
I'm planning to insulate my slab with foam boards since I will later pour a floating concrete floor with underfloor heating.
The surface of the slab is a bit unevenly poured (bumps and such). In some places, there's a difference of about 30 mm between the highest and lowest point. I thought about leveling the surface so the foam boards don't break.
What material can I use, sand, gravel, expanded clay balls, or some other gravel material?
Or is it best to use self-leveling compound or fine-pour the surface?
I would prefer to use something that is cheap and quick.
/ Xilak
I'm planning to insulate my slab with foam boards since I will later pour a floating concrete floor with underfloor heating.
The surface of the slab is a bit unevenly poured (bumps and such). In some places, there's a difference of about 30 mm between the highest and lowest point. I thought about leveling the surface so the foam boards don't break.
What material can I use, sand, gravel, expanded clay balls, or some other gravel material?
Or is it best to use self-leveling compound or fine-pour the surface?
I would prefer to use something that is cheap and quick.
/ Xilak
And I say lecakulor. Why use moisture-binding sand when you can use leca that works as insulation? Not that I'm particularly knowledgeable, but you should be able to skip the foam plastic and go with leca all the way and then pour concrete on it.
mats_o:
I’ve been considering clay pellets, but I read somewhere that these should be dried before they are covered. I read somewhere that clay pellets can have quite a high moisture content if they aren't dried properly after production, does anyone know more about that?
I think I get better insulation value with foam plastic than with clay pellets.
/ Xilak
I’ve been considering clay pellets, but I read somewhere that these should be dried before they are covered. I read somewhere that clay pellets can have quite a high moisture content if they aren't dried properly after production, does anyone know more about that?
I think I get better insulation value with foam plastic than with clay pellets.
/ Xilak
After advice from a professional, I used Dolomite. I bought a coarse crushed variant with about 4 mm grain size, which I used where there was a lot to fill, and a fine-crushed one to fill in smaller depressions.
I found the coarse-crushed at the tile company, and the fine-crushed is marketed as garden lime.
The advantage of Dolomite is that the grains stick together a bit more, so it stays in place better than sand.
Dolomite is slightly water-soluble, so if you have a lot of moisture in the slab, sand might be a better choice.
I found the coarse-crushed at the tile company, and the fine-crushed is marketed as garden lime.
The advantage of Dolomite is that the grains stick together a bit more, so it stays in place better than sand.
Dolomite is slightly water-soluble, so if you have a lot of moisture in the slab, sand might be a better choice.