Here is what I did. I designed my own building (40 by 42') and used 2 steel trusses from this company. https://www.facebook.com/PERKABUILDINGS I also purchased 1/4" thick foil backed foam from the same company to install under the metal siding. I have no condensation problems at all. What really surprised me was how well that thin (1/4" thick) insulation keeps it cool from the sun rays in the summer. Yes, when it's hot it's hot, but nowhere near like a typical metal building.

One picture in my Flicker photos shows the building as we framed it.

Good luck

John

~ J Lucas
2006 GMC Envoy 4.2 I6
2023 Ram 2500/Cumins 6.7 I6
2010 Jeep Grand Cherokee (Wife’s)
2002 Silverado 2500 Gas 6.0
1941 Chevy 1/2-Ton
1942 Chevy 1.5-Ton SWB
In the Gallery
My Flicker Photos!