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We have insulated our garage. Inside there is water and heating. Humidity is monitored via KNX and if necessary a skylight opens slightly for ventilation.

Then the question is what even gives you the idea to insulate the roof? That would be complete nonsense..

To keep the garage frost-free in winter, I also insulated it. Insulation in, vapor barrier underneath... Result: garage frost-free in winter. In summer, however, the insulation started to sweat. As a solution, I created ventilation between the insulation and the roof covering and replaced the vapor barrier with a moisture-variable vapor retarder. Now I hope it really works..

That's exactly what it's about, that the garage is frost-free in winter and you can also tinker without the heat, for example from the gas heater, dissipating directly.

, how did you implement the ventilation? Do you have some pictures of it?

But the garage is usually frost-free in winter even without insulation, right? And if it's not for a few days, who cares?

That's exactly what it's about, that the garage is frost-free in winter and you can also tinker without the heat, e.g. from the gas heater, dissipating immediately.

, how did you implement the ventilation? Do you have some pictures of it?

I simply drilled a hole about 10 cm in diameter in each rafter bay on the outside and then installed a ventilation grille. If you believe the advertising promises of ISOVER, the humidity-variable vapor barrier should already be sufficient.