"Steve" wrote in message
. uk...

The finished floor will be thickened by a further 15mm as we have T&G
engineered oak floor to go on top of the Caberboard. This should help with
the point loading but will not help much with any bounce if there is any.

Metal plates would be a good idea but would be difficult to implement with
the oak floor.

What will stop the piano marking the floor?
160kg on most castors is going to put grooves in a wooden floor IME.


It is unlikely that the piano would be moved from the spot. There just
isn't the room!

I wondered what the acoustics will be like and if it will hold tune if the
floor sags unevenly.
Is there a mechanism to level the piano or doesn't it matter?

Have you considered casting some concrete pads under the floor and building
some small supporting piers in the correct places?
It is probably easy if you are going to cover the floor.

BTW you can get some nice electronic pianos these days that play like the
real thing and don't need maintenance every six months, take up less space
and are cheap(er).