ᐅ Cladding the Space Between Semi-Detached Houses – What Is the Best Approach?

I need your ideas! We have built a prefabricated house as a semi-detached unit next to an existing masonry house. Unfortunately, the wall of the existing building is not straight, so we have a gap of up to 30 cm (12 inches) at the base, while at the gutter level there is no gap between the buildings. Does anyone have suggestions on how we can cover this gap? The site manager recommended using a perforated metal sheet or a ventilation grille to prevent mold from forming behind it. The plastering will be done soon, and I would like to take advantage of this opportunity.

I appreciate any suggestions.

In such cases, pictures greatly help to support understanding.

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I should have thought of that right away.
Attached is a picture of the problem.

Unfortunately, I can’t help you technically, but this already looks like a case of: built strictly according to plan, but without any common sense. That’s just unacceptable; it could (or should) have been filled in right during construction.

I’m just trying to imagine what you might find there after a few years... keys, children’s toys, the neighbor’s cat,...

Fuchur schrieb:
Unfortunately, I can’t help you technically, but this already looks like: built strictly according to the plan, but without any sense. This is unacceptable; it could and should have been filled during construction.

This is a perfectly executed building separation joint designed to prevent structure-borne sound bridges. In new construction, these joints are usually left unfilled; on the contrary, filling them with binding loose-fill materials like expanded polystyrene (EPS) or similar actually ruins the effective impact sound insulation of the multi-layer party wall.
Perforated metal sheets / ventilation grilles and so on can work, but you have to make sure they are mounted permanently elastically against the exterior wall. Otherwise, you create a sound bridge.

Ok, then I withdraw my professionally unqualified objection.

It is precisely the solid connection that makes a semi-detached house what it is. We have already lived in two different ones and never had any problems with noise from the neighbor. I still don’t understand the purpose of the gap if a semi-detached house was what was wanted.