ᐅ Interior window sills with shadow gap detailing

Hello everyone,

I would like to have interior window sills with a shadow gap in my house. Originally, I wanted to use "Helopal linea," but both my plasterer and carpenter advised against it. They said that installation on plastered walls is extremely difficult and they cannot guarantee a clean result.

So, I started looking for alternatives. I came across interior window sills with pre-assembled shadow gap profiles. According to my carpenter, installing these should be straightforward. However, I am skeptical about the HDF material they are made of. My clear preference would be cast marble.

Therefore, my question is: Does anyone in the forum know where I can get the type of shadow gap profiles shown in the attached picture? Or does anyone know of a similar product made of cast marble with pre-assembled profiles?

Many thanks!
Clemens

Could you please share a picture showing how something like this is supposed to be "installed"? I can't quite imagine it. Shadow gap between "what"?

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Thank you for the feedback.
This is roughly how the installation should look.

You get the same shading effect if you let the windowsill extend about 2cm (1 inch) into the room without a joint. The main difference is that significantly more installers would be able to do this flawlessly.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

11ant schrieb:

You get the same shadow effect if you let the windowsill extend about 2cm (1 inch) into the room without a joint. The main difference is that many more installers would be able to do this perfectly.

Unfortunately, this option is not possible for me. A flush finish with the wall is a basic requirement for aesthetic reasons.

But Helopal, as far as I know, offers accessories or profiles specifically designed for this shadow gap.