Got some Glava insulation and moisture protection film. I heard that this moisture protection film was extremely important to prevent hot humid air on the inside to leak out and condensate in the insulation. There it will be trapped and can cause damage over time to the wooden structure. It's very important that the film is on the inside of the insulation, understandably
On the roof it will be a PITA to apply that protective film without taking down all the roof plates, which also would be a PITA. Did some research about it, and it turns out as long as the insulation is less than 20 cm, the condensation will occur on the outside of the insulation, this it will simply evaporate. My insulation is 10 cm. All this moisture thing is really of academic interest for my garage. How wind tight it is, is of importance too. My garage isn't exactly wind tight.
In new houses in Norway the insulation is much more than 20 cm, and they are super wind tight. Then this is a real problem of course, only not in my garage. I just continue with this moisture protection film on the other walls (since I bought a lot of it, and it's easy to set up), but not on the roof.
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