ᐅ Internal roof gutter: How to implement cost-effectively?

Hello everyone,

We are currently uncertain about our roof construction and carpentry work. We would like to have a clad shed roof with an internal gutter, but we are unsure how to install the gutter cost-effectively within this setup. This is roughly what it should look like:

Our architect (old school) has planned the following construction for the eaves side:

As you can see, he intends to work with an extended bracket. This raises concerns for me regarding the costs.
Do you see any other options? For your information: Due to the low pitch (8°), it will probably be a membrane roof.

Thank you in advance.

Is there no additional insulation layer (Pavatex or similar) above the rafters? From the detail, I see a ventilation gap above the rafters, correct? With a roof pitch of 8 degrees, a standing seam zinc roof might be an alternative, if you like that style.

BobRoss schrieb:

Is there no additional insulation layer above the rafters (such as Pavatex or similar)? From the detail, I see ventilation above the rafters, right? With an 8-degree roof pitch, a standing seam metal roof might be an alternative if preferred.

- No, apparently all the insulation is planned to be installed between the rafters.
- Exactly, there should be ventilation.

The remaining question is: How can this "internal" gutter be cost-effectively implemented or covered without having the complicated construction at the eaves?

.. and always keep in mind that it must remain plasterable.