We are looking at potentially building a barndominium (a steel building finished inside to use as a residence). After erection of the steel structure and exterior, I will need to frame out exterior walls on the side of the insulation. The steel building itself will be loadbearing and protect from wind and elements; the wall I'm framing will be purely for finishing (providing a place to attach drywall and running pipes and electrical wires)
Much of the house will be two stories and can be build with standard 8' or 10' 2x4s, but the great room will need to be approximately 20' tall leading up to a finished ceiling. I am hoping to frame and install these walls with as little help (or machinery) as possible.
I had planned on 16" OC throughout the home, attached to the concrete pad using a nail gun. For exterior walls I considered a 2x6 top plate attached to the exterior structure for support, though that creates a thermal bridge that I'd rather not have.
How does framing a wall of this size differ from framing a standard 8' tall wall? I've seen 16' long 2x4s at Home Depot; does one simply build the wall the same as an 8' tall one using those? If so, how do I reach the remaining 4' to the ceiling? Is there anything additional I need to do to secure the wall given its higher center of gravity?