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