have a garage made of 145x45 framing timber.

I'm thinking of adding plastic and installing 45x45 as an installation layer inside the framing structure.

Since the walls are quite high, at 4.40, I was on the edge of what the wood could handle and a builder advised me to add a couple of 195x45 on either side of the windows. I would sleep more soundly then, he said (wise man) and then glue and screw OSB behind the drywall.

2 problems came to mind immediately about doing this.
1. It will be difficult to install 45x45 horizontally on the inside because there is a vertical stud "in the way" in every 3-4 bays (the extra 195). Should I still install them horizontally or would it be just as well to set them vertically?

2. I can't put the plastic as I intended on the 145 since those studs will be in the way =)

I also can't place the plastic on the 195, i.e., behind the OSB if it's to be glued to the frame?

Can I put the plastic between the OSB and the drywall?
 
You should manufacture 5 mm spacers so that the horizontal 45x45 beams align with the vertical 45x195.

Should the garage be heated to room temperature in the winter? If it's only heated occasionally or to a low maintenance temperature, you should not use any plastic at all, but rather some form of more vapor-permeable material.
 
It is also strapped outside with 45mm, so I am inserting the 195 so that it ends up 45mm inside the stud frame, I thought:)

I'm just planning to have maintenance heat, like 10 degrees.. then maybe more over the weekend or so if I'm going to be there and tinker.

It will probably be warmer inside than outside for the most part anyway:)

There will also be an upper floor in the framework trusses, and partly it will probably be warmer there than in the garage..
 
It's completely fine to have plastic between OSB and drywall. However, you must be very careful with the penetrations for electrical and plumbing in the plastic.
 
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