"HerHusband" wrote in message
...
We just completed the construction of our new house (did all work
ourselves).

All floors are constructed with 2x10 joists at 16" OC, with 3/4" OSB
subfloor, and solid blocking every 8' of the span.

The floors feel quite solid throughout the house, except in our living
room
where the floor is a bit bouncy. The span there is about 15' from sill to
sill, just about the max for 2x10 Doug Fir joists.


A little advice I discovered by accident while renovating my house:

Use pressure treated joists--they are made from a much harder, denser,
stronger grade of wood than typical doug fir. I did some ceiling joists
recently with a 12' span and walking up there (flat roof), it's as if the
frame were sitting on concrete on the ground.

Short of replacing or adding additional PT joists, I'd recommend a carrying
beam perpendicular to the existing joists, supported by lally columns on
cement footings. Lots of extra work, but ultimately, it solves the problem.

Normally, I do 2x12 joists for floors. And I love PT joists. They are almost
like steel "I" beams in terms of rigidity.


--
Take care,

Mark & Mary Ann Weiss

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