My house was originally built in the late 30s I put an extention on some years ago, kitchen 15'X12' and living area 10'x12' the original back wall is about 22' long. Although the outside was all insulated at the time, in the winter it is still cold internally where the old building meets the new. We have checked out the flashing and all the areas where the buildings join and they seem sound and intact there is no significant dampness. When I was offered insulation (which I already had in all of the exterior walls) I asked if they could put insulation into the gap between the old brick wall and the stud partition which we installed instead of just plastering, but the young chap had no idea what we were asking for and waffled about not being sure if it was a good idea to insulate internal walls.
I have wooden panneling (instead of wall paper) so I could take it off without then having to redecorate half the house but what do I put in? I asked them because I thought that liquidish foam would have suited and I did not think it was the kind of thing you could use for diy ing but it would be difficult to put anything else in without dismantling half of the back of the house.
The question is, is there anything that I could put in if I take the panneling off, I am not as fit as I used to be but my son will help and we are game to try almost anything that would help especially in this weather with the cost of energy as it is.
Thank you
