Hello everyone!
I allow myself to bump the thread again because we have similar thoughts and considerations. Ytong vs. sand-lime brick. Ultimately, both have their advantages and disadvantages, which for me are somewhat balanced, and in the end, probably the price (material + labor costs) would decide.
However, there is the following consideration: Our garage will be built in the gap between our house and the neighbor’s existing garage. A flat roof is mandatory in our case. As far as I understand, the garage ceiling will be sealed watertight towards our house. On the other garage side of the neighbor, a gap of a few centimeters is supposed to be left so that the garages stand separated from each other.
Question about this: Does the outside of my wall need any "treatment" against moisture, or is there nothing to consider? Just masonry and done? After all, you won’t be able to access it anymore. Does the moisture not penetrate into the interior?