I will place a treatment plant on a concrete slab two meters below ground level. Part of the slab needs to be leveled out since it has pits and unevenness. The area in question is about 7 square meters.
If I only want to level it out, it will be just 5 mm in some places. I assume that would be too thin and that I need to raise the level a little more to make it a sufficiently thick layer?

Any tips on what material I should use - is it possible to use self-leveling compound outdoors? Does fiber-reinforced Megaplan from Mapei work for this?
 
Most self-leveling compounds do not tolerate moisture. Cementbruk A can indeed be applied quite thinly.
 
Self-leveling compound works or a floor mortar...
 
Thank you, so I have two options, moisture-resistant leveling compound and cement. It seems difficult to find a leveling compound that is sufficiently moisture-resistant, i.e., can also stand under water - anyone have tips on a suitable brand?
 
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