I have a thought that is likely a result of getting stuck in some mental gymnastics.

When installing subflooring, the installation instructions say to leave at least 10 mm from walls and other fixed objects. This is to allow the material to move. But, doesn't the possibility for the subfloor to move disappear when you pour a couple of centimeters of self-leveling compound?

And how do you practically proceed? With a 10 mm gap between the wall and the floor, it becomes an adventure to self-level. Or do you calculate these 10 mm from the framework so that the 13 mm of the drywall covers the gap?
 
I haven't done it with floor leveling compound, but when a good friend poured 5cm for underfloor heating on top of the chipboard, we placed a strip against the wall all around, creating an air gap even around the concrete cake.
 
Well, but can the golvspån really move after applying self-leveling compound? I can understand if you're laying a parquet floor or vinyl flooring. But a couple of centimeters of self-leveling compound should make the panels and the leveling compound into one, rigid unit.
 
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Karlis Rode and 1 other
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you can probably put in a soft joint before pouring the self-leveling compound. styrofoam or similar, I think the floor chipboard itself doesn't move that much, but maybe it's on a wooden joist, or there are wooden walls around, and all this moves as the seasons pass.
 
Staffans2000
Sure, it can move.
Consider that railway rails are joined in 360m lengths. For every meter, there are three fixation points. Nevertheless, after installation, the rails are heated to an annual average temperature, upon which the bindings (joints) are loosened, and after expansion, remounted.

An elastic "Massa" (has nothing to do with F1) at the periphery with the same height as your floorboard is not wrong. But a cm.!!!
Pull me backwards all the way into the birdhouse!!!!!! A couple of mm. is enough. So why not load the syringe with latex sealant?

Staffan
 
A few millimeters and latex sealant I can buy. What I reacted to was the 10 mm stated in the installation instructions. Then I fully understand that chipboards can swell and shrink depending on temperature and humidity. However, I still find it hard to believe that the flooring chipboard can move in the horizontal plane after applying self-leveling compound. One of the tasks of the self-leveling compound is to make the substrate non-movable so that tiles can be laid. I imagine that concrete, unlike steel, does not expand after it has set.
 
It probably moves too. Even cast concrete bridges usually have expansion joints at least at one end. Whether it's solely due to the steel reinforcement, I suppose I'll leave unsaid.
 
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