anthony966,
Actually, the building specification you're looking at is a little more lenient on the "1/32 undercut allowed for every 12" than D1.1 is. D1.1 allows NO undercut greater than 1/32" for material less than 1" thick. The "for every 12" isn't a factor except that undercut is not to exceed 1/16" for any accumulated length up to 2" in any 12". In materials greater than or equal to 1" thick, undercut is not to exceed 1/16" for any length of weld.