Mort Stevens wrote:
2x3's have been around a long time.... they don't have the structural
strength of a 2x4, and require 12" c/c spacing when used in bearing
wall partitions.... that means 25% more studs than if you used 2x4s
(plus the additional labor cost of setting 25% more studs!), so much
for cost savings! In my area, for the past 25-years or more, it has
been typical to use 2x6 studs for exterior walls because of the
additional insulation space available.


Mort
And by all means check your local codes before using the 2x3s.
mahalo,
jo4hn