Will closed cell spray foam on rim joist interior be a vapor trap with 1″ XPS on exterior?

We are in Southwest PA, climate zone 5. Right now, our house is going to have 1″ of XPS on the exterior walls, including rim joists to the basement. We… We are in Southwest PA, climate zone 5. Right now, our house is going to have 1″ of XPS on the exterior walls, including rim joists to the basement. We…Read MoreGreenBuildingAdvisor