I believe this is not a roof problem, but just another case of the even longer wished-for issue of ArchiCAD not displaying dashed (or any non-solid linetype) in a sensible way - so that two dashed lines on top of each other can result in a solid line.
Trying to reproduce this just now, I only had one valley that showed as solid. I dragged all of the roof planes away from one another, and all displayed properly as dashed.
My roof settings were for:
Show on Stories: all relevant stories
Floor Plan Display: Projected with Overhead
Show Projection: Entire Element
Uncut Lines: Solid Line
Overhead Lines: Dashed
and my Floor Plan Cut Plane was adjusted to include the entire roof.
Maybe I'm missing the problem though?
I've been searching the forum for an answer as to how to show only the roofs eaves as well as a bit of the lower part of the hips and valleys on the stories below the roof story. In the old pencil drafting days on plans of stories below the roof story we only showed the roof eaves above with a dashed line as well as few feet of the bottom of the hips and valley lines to indicate the roof layout above.
In ArchiCAD, when I show a roof that is above a story all of the roof's lines (eaves, hips, valleys and ridges) show up. The upper part of the roof's lines are uneeded on a floor plan.
Can this be controlled with the Floor Plan Cut Plane setting?