In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where it ties into the framing of.
How to fit lean to roof.
The other side is for overlapping the panel.
Use a 2 by 4 inch board for a short roof up to about 8 feet a 2 by 6 for a longer one.
Next place the supporting posts into the notches.
This is where the supporting post will rest.
If you ve wondered how to frame a lean to roof off a pole barn this video will show you how i did it.
Cut out a notch on the top of your posts as shown in the image above.
Measure the width of the outside wall and cut the board with a circular saw to the same length.
The side of the panel that has a slightly flat side is to place on the roof.
I cut rafters out of 2x8s frame this pole barn lean to.