Looking into buying this house that was built around 1900. From the photos, it appears that there is a layer of shiplap underneath the siding. Is there any way, barring ripping all of the siding off and re-sheathing and wrapping the house, that I could go about insulating? I've read a bit about insulation and moisture problems, and the idea that you need the vapor barrier seems to be somewhat disputed (according to this article the sheetrock ends up behaving as a vapor barrier). It also appears that this structure has some lateral bracing, so the sheathing may also be overkill. So what would be the most efficient way to insulate? just pack the walls with insulation and seal for air leeks? Get some closed cell foam panels and cut to size? Experience would be appreciated.
Also found this interesting article.