Steve wrote:
Time soon to put new floor down in lounge, but it is a bit more
involved.
This floor has to support a substantial dead weight or two - A
Steinway Concert Grand Piano that weighs in at 480kg, or about half a
tonne. The weight is, according to Steinway, evenly distributed over
the three legs i.e. 160kg per leg.

The other dead load is a lighter but still heavy - Boston upright
piano that is probably half the weight or less and with weight on
four feet, although centred on a much smaller overall area. .

The remaining "live" load will be furniture etc. - normal things :-)

Couldn't you play the mouth organ instead? :-)

The existing joists are 4" by 2" and are at present supported by
sleeper walls at 5 foot centres, the spacing between joists is 10"
with no noggins.

I built a deck for 2000kg hot tub last year. 6 x 2 joists at 12" centres
supported every 4'. Not a millimetre of movement!


--
Dave
The Medway Handyman
www.medwayhandyman.co.uk
01634 717930
07850 597257