I just got my metal building installed yesterday after a 4 month wait. I have been doing research for a while and have found a lot of conflicting info regarding insulating metal buildings. I moved to FL about a year ago and am still learning about the climate differences. Your climate and building material are two of the most important aspects of your insulation choice. Check out the Garage Journal forum and do a search. You will found a ton of info that will help you decide. My building is 1200sqft and I may install A/C in the future but I did install a commercial-type exhaust fan in the upper rear wall and a walk-through door near the front of the building. I insisted on a thick vapor barrier beneath the slab. I hope the exhaust fan is able to pull the majority of the heat out of the building using a screen over the walk-through door. I will be wiring for a mini split HVAC system either way. I haven't decided on insulation choice yet but I think foam is too expensive for what I expect from insulation. I still have wiring, lighting and a lift to install. I have another existing metal building (625sqft) that has foam board insulation behind OSB with a drop ceiling and no roof insulation that has no condensation issues. It also has no ventilation. If you can ask other metal building owners in your area/climate you can get real-world experiences as well. Good luck. Everyone likes photos:
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