Hello!

This weekend, I've glued flooring gypsum to grooved chipboard using Ardex S48 and a 6mm trowel.

But unfortunately, the glue doesn't seem to have adhered at the joint between two boards, so now the board is "loose" along the long joint on both sides as you can see in the picture.

I don't know if I was stingy with the adhesive, but I don't think so. Or if it was because I didn't apply weight to the boards that it ended up like this.

But what do I do now? One thought was to measure where the underfloor heating pipe is and then drill a few holes along the joint and push down some kind of mounting adhesive/fixing adhesive and try to get the joint to stop flexing?

Suggestions? I don't want to have to tear up the entire floor and redo everything.
 
  • A room with a partially installed gypsum floor, showing a gap between panels near the wall and a window above.
Did you prime with 7+8 or 8+9 first?
Screwed the plates?
How large is the area?
Can you cut away a piece and glue in a new one?

You're going to apply filler too, I assume?
 
No, just primed with Kiilto's start primer. The plates are screwed in a grid pattern. The floor feels completely solid otherwise except for these 2 seams in the middle. It could be that the seam is right between the screw row and therefore left "in the air"?

I don't think the floor layer should spackle on the gypsum board, it's he who asked me to glue the boards like this, then he would spackle the slope around the floor drain. It is supposed to be a wet room mat and a bathtub.
 
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