been putting this off as I feared the worse, trouble is, nobody else is going to do it 
floor boards in bedroom have been a bit ‘floaty’ in certain areas since we bought the place so it was time to see how far things had gone…
I start with the perimeter, removing boards as I go, not good, dry rot has left end joist completely shagged, needs to come out and be replaced, next joist back is fine though (or at least i thought)
moved onto the joist ends to see what they were resting on, seems the ends have been cut back before then half jointed and new small joist used to fill to end, no bad thing if done right which these were but the end joist pieces had rotted away again so I will just replace again with some more oak, I’d say this was last done a fair time ago, padstones are all fine with new padstones having been laid under the half joints so base for new joists are very good.
here you can see one of the half joints, in very good condition
his padstone was not so effective, this was underneath the joist that was completely rotten, expanda foam!
Gill said she wanted a centre island 
the whole floor has intermediate padstones under each joist so a pretty solid base, no rot whatsoever in the middle of the floor, just the perimeter
new joist in sat on cement bed, one of the new half joists in, weirdly, the oak used for these I only removed 3 days ago from outside the framework on outside of bathroom, keeping them thinking they’d come in handy at some point, wasn’t expecting it to be this quick! they’re a perfect size 
plenty to keep me warm as things get colder
concreted in some double folded mesh to keep critters out from entering vents beneath floor
all boarded up again
Our build 