Tenement living room window bay paneling and insulation

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Hi there

I have a tenement flat in a tenement building built in the 1890s. I've just removed the ugly upvc window casing and wooden stool or sill. What's left then is the stripped upvc windows in wooden frames, sitting on the sandstone exterior wall.

I like the original wooden panelling and would like to replicate that as far as possible. I'm wondering about insulation for one thing.

The large wooden panelling boards to either side of the windows and beneath the window sills are not well secured against the wall behind them and there is about an inch or two of empty space behind them (see photos).

  1. Is it a good idea to put rock wool between the panels and the exterior wall?
  2. If so, is it a good idea to put insulating plastic to cover the rock wool to exclude moisture?
  3. Is it a good idea to line the edges where the wooden window frame meets the sandstone with expanding foam to further insulate?

Thanks for reading
 

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