Yep that's it - a Dutch Gable Roof. Now at least I know what its called. I looked at the KB referenced above which confirms that's exactly what I am trying to build....but I only have the Interior Design version of the software - which doesnt have the ability to edit roof planes like in the tutorial as far as I can see?
Is there any way to achieve a Dutch Gable Roof with the Interior version? (ie based on the wall definitions only). Thanks.