Awl--

When choosing beams for supporting roofs, floors, etc, what is an acceptable
deflection over a given length?

I'm looking at a 12 ft beam, supported at 0, 6, 12 ft, and depending on the
beam I choose (and various point/distributed loads), I'm winding up w/
deflections of between .010 and .033 between supports, ie, at about 3 and 9
ft.

What is acceptable? Is this a matter of local codes, or do rules-of-thumb
apply here?
--
Mr. P.V.'d
formerly Droll Troll