Hello.

Recently bought a house where they had an extension directly against the previous facade, which I have now decided to demolish to reduce wall thickness.
This has in turn created a gap between the older and newer part.

I know that you should not anchor the building bodies to each other, but framing to lay floorboards shouldn't be a problem, right? I will also need to screw studs against the former exterior wall to build new interior walls in the extension...

I'm thinking of placing a longitudinal stud directly against the cleaned exterior wall of the old part to lay boards on. Boards that are screwed into both the stud and the floor structure of the extension.
 
  • Measuring tape showing gap between old and new construction sections with exposed inner wall structure.
Sounds like a reasonable approach.
But in the gap between the buildings, the black part in the picture, is it open straight down to the free air?
In that case, you need to insulate and make it windproof from the outside.
 
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