Garage insulation, glass wool, OSB board, vapor barrier, insulation

Hello,

we had a wooden stud garage built.

It consists of prefabricated wooden studs with 8 x 8 cm thick timber.
On the outside, an 18mm thick OSB board is attached which is plastered.

Now I want to insulate the whole thing on the inside.

I was thinking of

putting 80 mm of glass wool between the studs and simply screwing another OSB board on top.

Or should I add a vapor barrier as well?

I would be grateful for other suggestions etc.

Hi,

is the garage already erected? OSB on the outside? Will the plaster hold there? I wouldn't have thought of that somehow.

Normally, the OSB board is installed on the inside, in the weather-protected area. And just plaster as weather protection would be too risky for me. If you have an insulated wall, it has to become more vapor-permeable from the inside to the outside. Unfortunately, the OSB board is not vapor-permeable but, besides providing bracing, also serves as a vapor barrier. Therefore: OSB board on the inside and vapor-permeable plaster carrier board on the outside.

Regards