On Fri, 21 Sep 2007 00:54:33 -0700, Robert
wrote:



In fact I face a related problem. I plan to put an upright piano into
our 1960s house and the position it will occupy means that all the
weight will be one two joists running parallelto the piano. the
joists in the house are inadequate; I have alrady had problems with
the floor moving when I piled a lot of books on it, so I plan to add

How many books? Thousands?

some supports under the floor first. i was going to support the
centres of all the joists by wooden struts up from the ground each
standing on long planks placed on damp-proofing membrane placed on the
ground. Adjustment would be by carpenters wedges hammered together
and then nailed. I woul ddo the whole floor, to reduce the
pringiness, not just the two joists under the piano.

In my case it is the springyness that is the problem, not the danger
of collapse.

R


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