To clarify there's the 'aesthetic arch' which may appear to be an arch but isn't an arch at all, such as the corbelled arch.
As opposed to the 'engineered arch' which does offer a structural advantage.
The 'gables, chevrons, roof structure' in G3 fall into the aesthetic arch category in that they provide no advantage over straight gables.
In fact their profile can only serve to weaken them under vertical and compressive loads.
Not all arches are created equal.
I have no idea why the builders would choose to select a 'false arch'.
Although it is an interesting and very complex configuration, don't you think?
Edited 1 time(s). Last edit at 27-Oct-17 03:44 by Jon Ellison.