Hello, I am looking for more information or to speak with someone about external foam insulation. My builder wants to put on 1/2” foam, but I am unsure this is the right thing to do. We currently have it framed as a 2×6 and are considering closed cell foam on the interior. My concern is the thermal bridging where he suggested the 1/2” exterior foam. We are in climate zone 6 with climate 7 in the county just north of us. Would it be okay to put on the 1/2” or put on none at all?