House and garage, close the gap between both structures?

Thank you, so I'll let them seal the boat-building mush. As air holes, I'll give them a few Mc Donalds straws. Thank you. If no one else has a more reasoned opinion....Karsten

Here, the roof overhang provides sufficient protection; otherwise, a roof-wall connection strip should be provided (fixed to the wall, loosely resting on the garage).

It is important that the connection or the joint is executed permanently elastic, as there are two different building structures.

By the way, the question of whether the wall should have been plastered has already been discussed in this forum.

The joints have now been sealed with an MS polymer seam. It is now completely sealed. I still had an expired but still usable cartridge on the ship. It is now used up. Regarding the question of plastering, the site manager says: If we had built with brick facing, the Ytong would not have been plastered either. The concrete garage protects the stone like a brick masonry does. That also makes sense to me. Karsten

By the way, the question of whether the wall should have been plastered has already been asked in this forum before.

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I’m digging up the old case.
I’m currently facing a similar problem.
The residential building is being constructed by the general contractor. The shell of the building is standing. The garage is being built by myself, directly adjoining the house wall. There is a 2cm gap between the house wall and the garage wall.
The house wall is monolithic 36.5 Poroton. It is already built.
The garage wall is made of 24cm formwork blocks. It is not built yet.
As already mentioned: the gap between the two walls is 2cm.
Should the gap be left "airy" or closed, for example, with 2cm XPS boards or something similar?
From above, a connecting flashing between the house and garage wall will protect the gap against rain.
What do you think is the smartest way to do this?!

House wall monolithic 36.5 Poroton. Already standing.
Garage wall made of 24cm formwork blocks. Not standing yet.
As already said: the gap between the two walls is then 2cm.

That seems contradictory to me: the second wall is not yet standing, but the distance is fixed.
A distance of 2 cm could at least be almost completely used up by tolerances locally; maintaining a constant 2 cm gap requires quite some experience.

Should the gap be left rather "airy" or closed with, for example, 2cm XPS boards or similar?
From above, a connecting sheet between the house and garage wall will protect the gap against rain.
What do you think is the cleverest way to do this?!

No, of course I have no experience with clumsy constructions *smile*
and a gap in literally textbook expansion joint thickness is certainly best as an air gap, although not only easy to seal against rain. The seal should be flexible in this regard, so as not to transfer forces.