Cladding the gap between semi-detached houses - What is the best way?

It is precisely the solid connection that makes a semi-detached house a semi-detached house. [...] I still don't understand the purpose behind the gap if a semi-detached house was desired.

With this perspective, we are probably increasingly standing alone. In the past, people thought like that. The currently more typical semi-detached house builder probably thinks more along the lines of "let the flood come next to me"; for them, enemy territory begins next to the shared boundary. This modern mutation of the semi-detached house builder knows only one motive: to compensate for their too little money for a plot with a one-sided reduced boundary distance. Lord, throw brains down from heaven!

In the old town, one takes boards, man-high

Yeah, you can easily throw trash over it then ...

Yeah, you can then easily throw trash on it ...

But this shouldn’t be the problem here