Gee, do 2 years pass by fast! Yes they do!
Anyhoo, I've sort of given up on the garage-basement idea, because it seems I still have problems with water somehow finding its way inside. Here are some photos to illustrate what we've done so far:
All the crap that was up against that wall is now removed:
We removed as much as we managed on the side as well, I will make steps there:
We dug up the entire front of the garage as well, where most of the water seemed to come in:
Replaced the plastic (Notice the right hand side, outer corner. This is the only place we couldn't manage to dig up from either the front or the back of the house, and I'm guessing the water either comes in here, or it comes in in the small gap between the bricks and the garage floor and seeps down..):
Not really related, but we changed the asphalt with bricks:
Now, I've started considering closing off one side of the garage (the one to the right).
We only have one car, so we only use one side of the garage. Then the rooms below can be used for storage of all the stuff in the garage now.
There are some pros to this:
1. Much more height available (281 cm), giving me the possibility of angling the ceiling?
2. More room for slightly angling the back wall and one of the side walls (the new wall dividing the garage, for example?) reducing the need for diffusors and clouds? (Atleast that's what I've gathered from some reading around here)
2. No water issue!
3. It is even more separate from the house, with the left garage side inbetween.
4. The entrance to this room can be from inside the garage which is locked when the gate is down, making it harder to reach for unwanted people..
I feel sort of bad for throwing away the nice suggestions I've been given here though :/ But at the same time, I don't want to take the risk with possible moisture and water coming in if I'm using the rooms below..
One last alternative might be to only use one of the rooms in the basement, the one where you can see the window in the first two photos. But then you have the low ceiling, direct connection to the house, etc.
Best regards,
Alex