Tenement living room window bay paneling and insulation

8 May 2022
Reaction score
United Kingdom
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


  • IMG_20220508_134920897.jpg
    286.8 KB · Views: 90
  • IMG_20220508_134932691.jpg
    251.7 KB · Views: 87
  • IMG_20220508_134936573.jpg
    261.6 KB · Views: 88
  • IMG_20220508_134941563.jpg
    193.1 KB · Views: 82
  • IMG_20220508_134950027.jpg
    177.3 KB · Views: 87
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local