On Sep 21, 8:56 am, Mogga wrote:
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?

Yes, probably about two thousand books.

Robert