Insulating a pole barn *loft*
I’ve read many posts about insulating pole barns, but nothing seems to address my particular scenario. I’m building a 24x36x16 gambrel-style pole barn near Seattle, WA. It will be two stories — the ground floor (concrete with visqueen underneath and the back 12’x12′ will have foam underneath the concrete) will be a shop, and the upstairs is planned to be an ADU. There will be a door separating the ADU from the shop, at the top of the stairs.
My question is whether or not this will present a more insulatable space than the normal barn being referred to in other threads here. I plan to frame in the ADU completely with 2×6 studs, with 2″ cut out so that it will be flush with the posts. The roof will have a continuous vent, and I’ve signed up to have the building wrapped in tyvek as well. The floor system for the loft will be glu-lam beams making the 24′ span, and TJIs running perpendicular spanning the 12′ between glu-lams.
Is there a way to efficiently insulate this space despite it being a pole barn that’s not spray foam?