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How to catch a concrete slab with welded mesh of 13 cm not being right? Can we add cement glue knowing that the screed would be about 3 cm. Will that hold?

The adhesive mortar is not made to make up a difference of level of 3 cm. It can make it possible to correct flatness defects of a few millimeters, but not of several centimeters. A difference of level of 3 cm deserves, at least, a fibered patchingor even a mortar screed.

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