Cicero wrote:
On Thu, 20 Sep 2007 20:38:15 +0100, Owain wrote:

Cicero wrote:
Google pictures suggest that it's on castors which in turn suggests very
localised loading. It would be worth considering some kind of load
spreader made from material other than wood which can't be easily
penetrated or indented by pressure.
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I'm slightly more concerned about the point loading too. I think I'd be
inclined towards thickening the floor rather than the joists.

If belowfloor supports are used, it might be worth recessing polished
metal plates into the finished floor to (a) spread the load, and reduce
indentation into a soft floor, and (b) indicate the correct location of
the piano feet.

Owain

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I, too thought of inset metal load-spreading plates, but the hard plastic
castor cups mentioned by the OP (and recommended by Steinway) seem to be a
sensible compromise. It gives the OP an option to move the piano to an
entirely different position if he should decide to do so without having to
re-work the whole of his floor. Of course the OP, if he wished, could
prepare a fixed location with inset plates and use the castor cups for
occasional use in other locations.

Cic.
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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.

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

Steve