Vapor barrier under screed not glued

Hello,

today the vapor barrier was installed on the concrete slab in the basement, followed by styrofoam and the staple board for underfloor heating.
The construction management description states the following:

A vapor barrier membrane against diffusion moisture is installed and welded or glued throughout the entire basement (Manufacturer: KNAUF type Katja or equivalent).

Since the craftsmen behaved completely inappropriately (large scratches in the fresh plaster, door handle torn off, bottles missing, took the pallet with them ...), I felt that I needed to check whether the foil had actually been laid under the styrofoam. So I lifted one board and looked under the styrofoam. The black foil was there, which is the good news. However, it overlaps by about 10 cm, but is not glued or welded, at least not at this spot. The longitudinal seam was glued. Now the question is what to do. Is it bad if the foil overlaps but is not glued? It is certainly not vapor tight this way. Is it worth having everything torn out again because of this? Or is it rather to be considered uncritical?

I type, must be glued.

Since we installed the Katja ourselves, I can tell you that the Katja only has adhesive tape on the longitudinal side. Our construction coordinator got us an all-purpose adhesive for a cartridge gun for the non-adhesive side.

Basically no expensive or time-consuming effort. You can do something like that yourself as well. For the 2 hours and 30€, you can of course also do the wave and wait until the gentlemen come back. If I were you, I would do it myself. Clarify the warranty with your construction company and invoice them for it.

Especially if the screed appointment is approaching.

Got all-purpose adhesive for such a cartridge gun.

The stuff is extremely expensive, a cartridge costs €15 and you get almost nothing out of it. Therefore, I got bitumen cold adhesive in buckets; a 5L bucket costs €10.
For sealing the longitudinal joints to the wall, or in our case to the concrete wall where there is no cavity wall barrier, we glued the Katja Sprint connection strips to the wall.

If the longitudinal sides are glued, that's fine with Katja. The short sides must be glued with the cavity wall barrier. We also pulled them up to the first row of bricks.

15? Rather 5.

Actually, it is sufficient if only the long sides are glued. What is supposed to happen?