ᐅ Roof Pitch for Glass Walkway – Is 2 Percent Realistic?

Good evening everyone,

My wife and I are currently building a house consisting of the main building and an extension. The two parts are supposed to be connected by a glass corridor (a three-sided glass element: 2 glass walls plus 1 glass roof).

The window company says they have to build this stylish flat roof glass corridor with a minimum slope of 10 degrees and cannot make it shallower. Their reasoning: warranty requirements.

Unfortunately, we find this very unattractive. We had expected a much flatter roof. Our architect says that a 2-degree slope should be possible.

Now the glass roof in the middle would be about half a meter (20 inches) higher than at the edges, so it would look more like a pitched roof than a flat roof.

Can anyone say if a 2 percent slope is realistic and which manufacturers might offer this?

Thank you very much and best regards!