Wallnut hard wood floor

The wall nut floor is glueded to the concrete floor with great care.
We have used 3 x the normal glue to secure the floor, this due to the under floor heating, the glue also alowes for movement.
The floor has been open for 6 weeks now at room temp, so we hope not much shrinkage if any. The has room to expand 25 mm on the outer walls.
Fingers crossed as no supplier give ant guarentee for a walnut floor over underfloor heating.
PS the boards are not small, that pencil you see is 12 inches long and a xmas pressy