Insulating garage roof, correct sequence of execution

So last winter, in my double garage attached to the north side of the house, it was never colder than 7 degrees. Usually, there were 2 cars inside that were driven daily (short distances). The garage is made of 24 cm Ytong walls (012) and the roof is insulated. Additionally, the window on the north side was mostly tilted open for ventilation.

My big engines have always "roared" for a long time - hence my statement on that.

And I never had stop/go...

It's not too much effort for me, but to each their own.

The old A4 in front of the cabin also only has 4 cylinders...

And btw I've never experienced frost in a garage... so something must be going wrong there.

The old A4 in front of the hut also only has 4 cylinders...

Nope, you're wrong - whatever you base that on. I never said I was referring to the car...

By the way, I no longer have the old A4 parked in front of my hut.

There are a few characteristics that reveal it... but let's leave it at that.

Then you don't know your stuff - but you're right, better to leave it, otherwise embarrassing