A client wants to put 1″ polystyrene on his exterior walls. I don’t see any problem with the extra foam, but I was wondering about the order of materials. The studs are 2×6, 16″ o/c, and he will have/wants 7/16″ o.s.b. over the foam board. My question is what is the “normal” protocol for the sequence, and should house wrap be used in an application like this? (foam first then 7/16″ o.s.b., or 7/16″ o.s.b. then foam?). He is using cementatious lap siding for the finish. I was assuming that the foam would go first, then o.s.b. Any problems with an install like this? I sure don’t see any construction of this type in my area. Any thoughts?
FHB chats with Linda Reeder, an architect, professor, and author of books on green and sustainable building, about her career experience.
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