After is adding the metal panels you will want the metal to extend 1 2 past the framing will run from tall side to short.
How to extend lean to roof.
From this existing post measure 3 feet distance in the same line dig a hole and drive the second post in.
If it is needed cut the metal roof panel to the length you need with tin snips hopefully you don t have too.
Use a razor blade to cut it and have it the size of the roof.
The rafter nailers spanning between the posts on the eave side of your lean to must be strong enough to support the load of multiple rafters.
Finish the shingles up to the top edge of the lean to as described in steps 1 5 above.
For roof spans 10 feet 3 0 m or greater 2 x 6 nominal framing or larger should be used.
Use a minimum size of 2 x 6 nominal southern yellow pine or other strong wood.
After the shed roof framing is complete finish the lean to along with any part of the existing roof from which you ve removed shingles with new shingles to blend the lean to into the old roof.
If the siding is vinyl use a siding removal.
Measure 8 feet from the existing structure towards the outer direction and dig a deep hole to drive the post in.