Hello!

I have a log house with very open spaces and a thunderous railway nearby, which sometimes causes significant shaking.

I’m going to replace the stairs in the hall and have decided to apply plastic and add insulation to the walls from the inside at the same time. I have removed the wall covering and have reached the planks; behind them is sawdust for insulation.

I have also removed the floor joist on the upper floor, which is approximately 2x2.5 meters. My plan is to frame new inner walls next to the old ones with 145*45 cc 60, insulate, apply plastic, OSB, and then gypsum board. Frame the new floor with the same dimensions, but with cc 30. The old timber beams were about 160*60, around 60 cc. I want the floor to rest on the newly framed inner wall. The new floor will not have tiles but parquet. Will this be a good and stable construction, or am I perhaps exaggerating?

Thankful for answers!
 
It will work well, I don't think you need to use 30cc studs, as I understand it, it is a maximum 2.5m span, and 60cc is more than sufficient.

The hardest part is knowing if it is good to use plastic in the construction. Does the rest of the house have plastic in the walls?

In several renovations, I have been advised by engineers/inspectors not to use plastic together with timber walls.

What does the wall structure look like when you are done? List the layers, for example, from inside to outside.
 
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