The floor is over 400mm centred joists & 18mm chipboard with a silver underlay (timbershield) if I remember correctly
It was part of a new renovation, there were some clearly bad area that became even worse when the heating went on.
It is a floating floor but also with the tongue and groove glued.
The builder has offered to replace the areas that are very bad with new boards at his cost. But I'm wondering if the whole floor will be ruined eventually.
Most of it feels fairly solid, but when you observe someone else walking on it you can see a very slight bounce and movement in the floor in certain areas. I am wondering how normal this is with a floating floor.
I was unhappy that the builder lashed the flooring in so quickly, while there was still painting to be done but he said that's how he always does it.