Engineered oak floor planks crowning

[Wilson78]

You use wedges at the perimeter for this.

No its supposed to be floating

Confused as solid Oak is that - solid and engineered Oak is not solid - it has a ply backing and a top layer of oak.

That is how an engineered oak floor is supposed to be done.

And I would second the "check all of the gaps all around.

OK this bit


Could it be that the whole floor has expanded and pushed itself away from this screwed down point and so now it is touching at other places that previously you left gaps at.

What you say , sets my mind at rest.
I agree ...yes...it's just a case of the floor has expanded due to normal conditions .
Because NOT One area was open for 'Point 2 point contact' with any bare concrete.
The rolls of underlay were all layed really recently.
Thanks yeh....appreciate your efforts