Do I need a vapor barrier in ceiling?

[mdg]

Just purchased a home in Lebanon TN and there's a 40 x 60 metal building that I'm looking to condition as a workshop. Not living on the property yet but was just there and realized there's no ventilation for what will be the attic space. I'm working with a contractor to put a metal ceiling in before I move the majority of my now basement shop. I asked him to replace the soffits with vented soffits and will be putting in vents along the length of the roof. The roof now has vinyl backed fiberglass between the metal and purlins. The bottom of the trusses are 14'. My plan was to do blow in insulation. I will cool and heat the space to at least bearable levels like 80 in the summer and 60-70 in the winter. Also putting in two 10' fans at 10' height. From what I've been able to see information wise is that colder climates seem to need a vapor barrier more when heating the living space but this whole topic seems a little vague as far as actual legitimate info. Thanks.

 

[Hank11]

Welcome to Tennessee.
No ceiling vapor barrier needed here. Although note that metal ceilings won't pass much moisture unless its a swimming pool below. Make sure you baffle the soffits so that your insulation is not up against the roof deck and blocking the airflow.

Unless you already own the fans (seems like expensive fans) smaller ones would be fine and much less money. A dehumidifier will be welcome and keep you comfortable when its hot and sweaty outside.

 

[mdg]

Thanks for the welcome and for the info. I already bought the fans but they weren't anywhere near the price of the Big A** fans. I'm sure those and the other companies that want your info so they can call you and give you a "quote" make great industrial fans but I'll find a better place to spend thousands on the shop.