WC Jerry,
Keep in mind what we always say "Code is minimum, it is the crappiest one is legally allowed to build to."
Nothing wrong with blocking 2x6 either.
When I was a working general contractor, 'is it code' or 'what does code require' never came up - I did not want to be associated with 'the crappiest I was legally allowed to build to'.
Code is like starting your car or truck up and driving around at idle all day ... it just ain't any fun to go minimum!
