Originally Posted by nealtw
I think if you look closely you might find the peice you said was 3 cm. You might find two peices like 5/8 and 5/8 or 3/4 and 1/2. But if they glued everything down it may as well be one peice. I suspect the gray stuff is just glue.
You will have to investigate some more. Sometimes you just have to take it down the joists and start over but that brings other nightmares with it, as the floor runs under the walls and cupboards and jointing to the old floor can be tricky
What does this mean, it hardly makes sense.
That one piece is DEFINITELY solid wood, why would you think it would be otherwise?
ALL we need to know is WHICH part is the subfloor. Why does it seem like this question is being avoided.