Better insulation and sound barrier. When I built mine I insulated the building then was left with an 8" air gap (width of the purlins) and then a standard 2x4 stud wall, which was also insulated and sheet rocked. I added on to my house last year and built the addition like a standard wood framed home. I lost the argument with my wife and ended up re-skinning the entire outside with Hardie plank. I miss my "Tin Shack" as I used to call it.
EDIT: Adding on to a metal building was a lot more difficult than if it were a wood framed house. Partially my fault when I originally drew the plans. I did not intend on adding on to it. I was planning on building in front and turning that into an outdoor kitchen/guest house. Just didn't have money when the time came. Adding on was our cheapest option. So keep that in mind as well if expansion is a possibility in the future.
Red is right in that it may be harder to sell, especially if their is a wife involved in the buying decision. They tend to look down on living in a "Tin Shack." I know that when I built mine in 2007, others that were looking into metal building houses had trouble getting financing due to the unknown of the marketability of them if the borrowers were to ever default. I'm not sure if that has changed since then. I know they have gained in popularity over the years.
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