I am modeling a house.

The extrude face tool is automatically rotated orthagonally to the face normal ( I am guessing ). I want to extrude the face on an angle. How do I do it?

ex. I am making a house. I want to extrude the roof-line to overhang the walls by a couple feet (at a 45 degree angle). The roof edge face is perpendicular to the walls. sooo, if I extrude, the roof edge extrudes perpendicular to the wall.