In article , ATP wrote:
Loren Coe wrote:
....
i would rather use 3 & 4, rather than 4 & 5 wood members, if
the wider spacing is no problem. this leads to the question:

with support at 32" intervals, how much load can a 2x4
support on its side?
....
The species and grade of lumber has to be specified. There is a wide
variance between spruce and douglas fir, for example.

it's "HEM FIR", Hemlock Fir, about the cheapest "stud" on the market.
these are about "util" grade, there is one about a dime cheaper at HDepot.
if there is a grade stamp, it must be, "STUD-R", manufactured in Cowlitz,
Wa. Thanks! --Loren