A good few years ago at a time when I couldn't be there to inspect the work, some tradesman employed as a part of a Council's building renovation scheme (a 'Common Repair') cut at least two floorboards in the middle of the gap between joists, so that the ends were supported only by the rubble packed in below as insulation and were thus free to float up and down when someone walked over them.
When I found one such extreme bodge I chiselled grooves in the top of the floorboards, fitted steel straps in the grooves which I screwed to the wood below, and poured in epoxy glue. Still a bodge, but less of one, and it seems to have stood up for years.
The position of this bodge next to a partition added to enclose a shower tray means that one can't just remove the floorboard halves and add a new uncut one. Not without removing the whole shower partition and heavy tray.
Is there an accepted method of repairing such atrocious workmanship?
I ask because a new tenant has just discovered that there appears to be a foot-long section of floorboard which has sunk below the level of the rest of the floor. Which might be a piece of floorboard lying between two joists and supported only by the insulating rubble (yes, I've come across that also).
I'll have to take up lino etc. in the kitchen nook to see what exactly has happened, but thought I'd ask about repair methods beforehand.
There is of course the unhappy thought that the wood might have rotted, but it's several feet from any source of water so I hope not.
Over the years I've also come across small hiding-holes apparently made by former tenants, for a purpose one can imagine. Another possibility.