Help adding a gable roof

[Paulco]

I am trying to add a gable roof over a door on a gable wall and the gable over opening tool wont do anything. any help trying to figure this out would be greatly appreciated. 

[DBCooper]

I don't think the "gable over door" tool will work when the wall is already a gable wall.  I think all it does is build a "gable line" for you automatically and the gable line won't make a gable on a gable wall.

 

You could create a "porch" room using invisible walls or railings and then tell the program to make a gable roof over it.  This will give you a slab floor and allow you to control things more automatically through the walls/room definition.

 

You could also just create the gable using two manual roof planes.