My shop is all wood construction and insulated. It still draws moisture because of a second floor and no ridge vent. Stay away from the foam its a fire hazard. Space heater with thermostat set at 40 or a coal stove. We had to do this or the machines sweat going from hot to cold. This barn was foam insulated. It went up in seconds and the owner a friend burned with it.
We have a coal / wood stove. 3 shovels every 12 hours. Keep the metal warm. Moisture is our enemy here
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