Transition from rain gutter to terrace roofing

Hello everyone,

I am currently building a terrace roof on our single-family house (bungalow). We are attaching the supports of the roof to the rafters of the house, so the roof starts exactly below the gutter. Now, a small gap is forming between the house gutter and the double-wall sheets of the roof.

Certainly, something would only get through in strong wind, but I still want to seal it. My first idea was to install a wooden cladding between the roof box and the support beam. However, there might be more elegant solutions?

I thought of a kind of flexible rubber lip or similar that hooks into the gutter and then presses against the double-wall sheets?! Does such a thing exist or has someone already carried out a similar project?

Thanks for your feedback and best regards Bros