Thanks, I figured as much.

My house is in Maryland where we get all four seasons, with a walkout-style foundation and a natural stone facade, built in the early 60s. I did some remodeling and got inside some walls above and below grade and found no vapor barrier. At the time I couldn't find good info so just assumed it was built correctly, and the vapor barrier was either part of the exterior or was not needed. Homes under construction around here you always see with Tyvek Homewrap before the siding goes on, which is assume is a vapor barrier.

Do you have any links as to the correct vapor barrier for each climate zone in the US? Like OP, I've never been able to find good info on that either.