Interior walls and add insulation to existing insulation?

[Stryfe]

I want to frame interior walls in my pole barn. The posts are 12’ OC and I planned to frame walls like you normally would until I read on here that people were framing horizontally and it piqued my interest.

I guess normally you would frame the wall, stand it up, nail it in to the posts and the bottom sill plate would nail/anchor to the concrete. In a post I read here someone said they ran their framing horizontal so it wouldn’t be attached to a floating slab. Thoughts? I kind of think it doesn’t matter and I’m over thinking it. Attached is a picture of my rough ideas. I’m not in framing/construction by trade so these are very rudimentary ideas.

My other question is: Can I add additional insulation into these newly framed walls before putting OSB up? I already have white vinyl faced fiberglass blanket in between the siding and girts.

 

[Stryfe]

I am worried about potentially creating a moisture trap if I add more insulation.

Another idea I suppose would be to run horizontal framing alongside the front of the posts but being 12’ OC I’m not sure there is enough support. Also would lose a small amount of floor space.

 

[billconner]

What climate or how much insulation do you need or want?

 

[Stryfe]

What climate or how much insulation do you need or want?

Dry, semi-arid. Southern Idaho, Boise area. I only plan to run 8' OSB on the walls to protect the existing insulation from damage so I wonder if adding additional insulation behind that is a waste of money.

 

[billconner]

I don't have any suggestions with much insight.

Of your proposed options, I think I'd choose the horizontal 2x6s and unfaced R21 fiberglass batts. I'd ladder the blocking against the posts (22 1/2" blocks with 2x6 bookshelf girts sitting on them) and try to attach them to existing wall gifts instead of blocking. Poly vapor barrier and OSB or wall of choice. I think I'd slash the vinyl on the existing batts.

Consider 2" rigid foam boards against existing girts and just attaching OSB through them to girts. I suspect higher materials cost - foam versus framing and fiberglass - but pretty fast and simple.