Correct installation: stone windowsill

Hello everyone,

when I read about the slope of window sills, I repeatedly notice that at least 5° is mentioned.

Unfortunately, I cannot find any guideline on this! The only one I found is from Austria. Of course, I cannot apply that to Germany.

Can someone tell me where I can find a precise description? I ask because I have the impression that the slope is nowhere correct here.
And in winter, of course, the roller shutters freeze shut in frost. I suspect due to insufficient slope.

Has the Rosenheim Institute or RAL written anything about this topic?

Thanks to you all!

Best regards

As far as I know, there is no binding regulation in Germany. However, there are guidelines ([Glaserhandwerk, Rosenheim]) that suggest a minimum slope of 5 degrees.

As far as I know, there is no binding regulation in Germany. However, there are guidelines (glazing trade, Rosenheim) that recommend a minimum slope of 5 degrees.

Do you have the guideline on hand? Name or possibly guideline number?

What is the name of the lady with the Heinz von Heiden house? They had a legal dispute and had all the window sills replaced. By the way, even if the slope is sufficient, the roller shutter gets stuck at the window sill.

Do you mean ?

Can someone maybe send me the above-mentioned regulations? The detail would be enough. Does anyone have that?