We would like to have a single-pitch roof with internal gutters, but we do not know how to fit a gutter into this design with minimal cost. The photo shows what it should look like. And how our architect drew it.
As you can see, he wants to work with a pin extension. My concern is the cost.
Do you see any other possibilities? For reference: Because of the flat slope (8°), this will probably be a foil roof.
Doesn't another layer of insulation (Pavatex or similar) go on top of the rafters? In the details, I found a back vent over the rafters, right? With a roof pitch of 8 degrees, a zinc double standing seam roof could be an alternative if you like it.