I am in Minnesota and need to re-side my home and add some insulation. Home was built in 1980 and (from the inside out) the walls are: 1/2" sheetrock, 4" paper faced baths between 16" o.c. studs, 25/32" 'buffalo board' and 1/4" rough face plywood siding and 16" o.c. battens. The home is lacking in insulation and weather tightness, both significant factors in Minnesota. We like the look of the 'board and batten' appearance the home has, and plan to refinish with the same, but I want to improve the envelope when I do it.
My plan is to remove the exist. siding and install tyvek and 1/2" of foam insulation, then again apply a rough face plywood, or a similar engineered product (LP Smartsiding or cement board panels or similar). I have a couple of questions:
1. Should I strip the walls with 3/4" board's, install the 1/2" foam between them to allow an air space behind the siding for drainage?
2. Vapor barrier, moisture barrier, air barrier... which do I need here?
3. Foam first, then the barrier or the other way around?
I am working out all the flashing and trimming scenerio's as we speak, but the order of operations has me stumped. Any other options or recommendations? Thanks in advance. -Mike