Need an opinion on the practical side of perm ratings
Thanks so much for your time and advice. I plan to build in a high humidity environment, with off-grid PV power. Central dehumidification is a must, and is by far the biggest electrical load. I don’t have a feel for whether plywood sheathing/OSB (perm range of 1-4?), combined with large wall surface areas, will allow a significant amount of moisture to creep into the house 24/7, requiring significant additional dehumidification beyond what we’d expect from normal interior sources (humans, showers, cooking, open windows, etc). Or, put another way, at what perm level can I maybe discount the exterior moisture transfer as rounding error?