
You probably should have insulation and also a complete vapor barrier against the roof panels. The easiest way to achieve this would likely be closed cell urethane spray foam sprayed to the back of the roof panels.
Hi, I have a 30x30 post frame pole shed that is metal walled and metal roofed, the walls are insulated with double faced rigid foam board with a radiant barrier as one of the faces, my question is what is the best way to insulate the roof to avoid condensation and heat loss. (the building is metal roofing over purlins) The shop will also be heated with an outside vented 75Kbtu unit heater.
I always thought you get what you pay for. Not in this case! I went with Hy-Grade roofing even though they were by far the most expensive quote I received. Worst decision I could have made. They promised to install the roof in 4-6 weeks, of course they were late. When they finally showed up without the proper equipment and they damaged my property. Sad part is that my poor wife found the damage after coming home from her frontline COVID job. Broke my heart to see how upset she was when she saw the damage! SHAME ON HY-GRADE! They are really proud of the “Quality Audit” that they do, but of course they won’t give you a copy of the audit…lol BTW - the “Quality Audit” they did at my house consisted of 2 guys coming over to pick up the leftover junk they left at my house for a month. They never even went up on the roof! Horrible customer service experience! Save your money use someone else!