Thank you for all the awesome information here. I wish I had known more about this site as a resource when my inlaws built their new cabin. Here is my concern/question…
Collectively, we built a new 40’x30′ cabin in the Adirondaks , NY. The crawl space foundation was poured and box set by the builder and we took it from there with a few exceptions. The floor sheathing is Advantec, the roof and side sheathing is Zip-system with taped seams. Pine ship lap siding on the outside, metal roof over perlins, and the roof system is not ventilated. The house was built with scissor trusses in the front third and attic trusses over the bedroom/bathrooms to creat a loft. Insulation was spray foam and done by a contractor and was at least 3″. Over the insulation went tounge and groove pine directly. The house is heated with a propane fired forced hot air unit. The only ventilation the house has built in are the bathroom fans. I’m worried about condensation that gets very heavy on the windows and what that means for every other place the vapor is driving through the interior siding and finding a cold spot. Am I worried about nothing? Do we need an hrv or efv to fix the problem? Could we just use some stand alone dehumidifiers? Thanks for the help.