posted 6 years ago
As long as the walls are protected from rain and summer sun, I think it will work fine. I have a friend who lives in Tuscaloosa, and have experienced late winter/early spring there, and I don't think it would be worthwhile insulating outside the cob walls. Most of the year the issue is cooling, and I think allowing the walls to be exposed to the night air will help keep them cooler than if they were insulated from it. Vines at the edges of the covered space would filter the heat and sun and make it pleasant. I would arrange the south overhang to allow winter sun penetration, and build a small heater for cold weather.
I do wonder if the weather would be conducive to making adobes and building with them, or if straight cob would work better. Experience from someone in that climate who has done both would be valuable.