They have to be the same material.
How to join a roof to a wall.
Below are the steps on how to join two roofs together if they have different pitch.
Most simply use a nominal 6 piece of lumber.
If they are the seam between them will go away assuming they are perfectly aligned.
The roof flashing is then placed up behind this through the wall z bar flashing on the outside of the vertical blocking backing material.
The roof framing itself in this.
Do the same for any leftover sides.
A lean to roof also called a shed roof slopes in one direction with rafters that rest against another structure at their high end and overhang support posts or an exterior wall at their low end.
Seamless roof wall join model them on top of each other drag the roof to the end of the wall and then use join geometry.
Toenail a truss into the top of the wall plate by nailing through the sides of the bottom chord at a 30 degree angle.
Joining two roofs with different pitches.
The exterior wall covering material is then kept off the surface of the roof.
When the roof of an addition garage porch or patio meets a brick wall the intersection creates a number of concerns.
This happens to your wall it forms into the shape of the roof to cover the gap.
How to frame a roof against a brick wall.
As with rafter style roofs toenailing is one of the most common ways of attaching a truss style roof to a wall plate.