Today I put a spirit level on the underside of a bearer in the bathroom area in the vicinity where the tiles had cracked.
The spirit level pivots underneath the bearer 300mm or 400mm from the pier by around 3mm.

Back in the bathroom the spirit level reveals that the yellow tongue chipboard in the same area is raised by about 4mm.

Everywhere else is level. Jumping around in the bathroom everything seems solid.

Could the 3mm pivot have been there all along or the result of the pier being pushed up (reactive clay) or the bearer pivot just be due to carrying bathroom floor load? Is it something to do anything about or just ignore?

The subfloor used to suffer from flooding in flood rains but that has been addressed.

As an added complication the bathroom has a mid span bearer and walls are supported by joist spans which probably isn't the best from a movement point of view? So in that event would it be better to keep the flooring unitary with the internal walls (use tile underlay to remedy) or cut out the yellow tongue chipboard floor, add new joists to support new flooring (Scyon) short end edges (but doing that will create flooring separation between the bathroom Scyon floor and walls/chipboard floor under bottom wall plates)?


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