ᐅ Closing the gap between the neighbor’s house and ours

Hello,

Does anyone have a tip on how we can solve this?
During our house construction in an existing neighborhood, gaps have appeared between our houses on one side next to the neighbor. Because of this narrow space, the bricks could not be plastered. See photo: there is also a gap at the front, but this narrows towards the back and closes like a triangle. I want to close both gaps soon to protect the unplastered bricks from moisture.

Due to the tightness of the spaces, my idea is to cut Styrofoam insulation boards to size (they are easy to cut to size) and glue them in with a slope towards the front, above the area where there is still plaster on our wall (if I can get in there somehow). If larger gaps appear on the right or left, these could be reduced with joint filler profiles and then sealed with all-weather sealant applied from a caulking gun. Afterwards, the whole thing would be painted white so it is less noticeable.

Would this be an option? Can we do it like this?
Thank you

Marc240 schrieb:

that would be my idea

…in my opinion, a bad idea.

Marc240 schrieb:

I want to close both quickly to protect the unplastered bricks from moisture.

If you want to protect something in between, I would do it from above – a roof extension and that’s it.
Insulating from the front and back seems to me the wrong choice and pointless.

We wanted to glue Styrodur above the top of the untreated bricks to protect the gap and the untreated bricks from rain.

ypg schrieb:


If you want to protect something in between, I would do it from above – roof extension and that’s it. Insulating from the front and back, I think, is the wrong choice and pointless.

Roof extension? That would be the neighbor’s house. Would the neighbor then have to alter their roof to protect our untreated wall from rain? Or is that meant differently?

Marc240 schrieb:

That would be the neighboring house.

Why? Don’t you have a roof on your building? Where exactly is the property line?

K a t j a schrieb:

Why? Don’t you have a roof on your building? Where exactly is the boundary line?

Of course we do. However, our house is 5–6 meters (16–20 feet) higher. The land slopes upward. The boundary runs directly between our houses. The roof extends right up to the boundary. Even if we extended our roof, the wind would still blow rain into the gap because of the height difference. So, only the neighbor’s roof would cover that area.

Are there no options to install something between our facades? Something that would drain the rainwater forward and prevent rain from getting into the gap? Would cutting Styrodur (extruded polystyrene foam) to size be impossible? It doesn’t absorb water, and with a slope directing water out of the gap, it should drain quickly anyway.

Boundary construction 6m (20 feet) high? That wasn’t immediately obvious.

Unfortunately, I’m not a technical expert. From experience, I would say that you always need a roof that collects and directs water away. Just putting something in between and sealing it doesn’t solve the problem in my opinion, especially if water falls on it from above and the area cannot dry out again. But maybe someone else has an idea.