The home I recently purchased has a metal pole barn/garage. I was thinking about insulating it. I was wondering if anyone had experience with insulating an existing pole barn. I am looking a cheap method. It doesnt have to be perfect I just want it comfortable in the winter. I'll probably put a wood stove and a salamander heater in it. I am leaning towards 4X8 sheets of rigid foam insulation but I am also considering spray foam insulation. Any suggestions would be appreciated.