Good advise but if it is just storage as stated, I would go for a
drop in the center as I described earlier and then not even be
concerned about weight. Even stronger and a whole lot cheaper.
Not to mention dropping from 14" to 6 or 8 gives a lot more head
room.

"Bob Morrison" wrote in message
k.net
In a previous post James wrote...
I plan to build a small garage, 20 feet by 30 feet.
I want to be able to span the 20 foot width, so that I
don't have to use interior posts.


Use engineered lumber I-joists. 14" TJI 210 @ 16" o/c
should be about right.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com