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Is it possible to insulate a garage roof in a steel tank with a pane between purlins and steel tank because condensation forms and passes through the umbrella? Can we apply 20mm of expanded polystyrene, then 45mm of glass wool and then OSB? There will be a blade of air under the steel tray but how many centimeters to leave?

The proposed solution is conceivable, provided that perfect continuity of insulation, which will not be the case by combining 2 different insulators. A thicker layer of expanded polystyrene would certainly suffice. Plan a water resistant panel to prevent any risk of rotting in case of occasional condensation.

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