Use a 2 by 4 inch board for a short roof up to about 8 feet a 2 by 6 for a longer one.
How to buid leanto roof.
You must consider the following.
Place the starting panel onto one edge of the roof.
How to build a lean to roof adding a lean to porch deck top lean to how to build a lean to porch with posts lean too ideas simple lean to roof construction.
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For the final step install the trim of your choice as a cover against the side structure.
Fit the trims to the sides of the lean to roof and lock them into place with 6d nails.
For shingles or 24 o c.
The other side is for overlapping the panel.
Measure the width of the outside wall and cut the board with a circular saw to the same length.
Screw it in with a drill.
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The side of the panel that has a slightly flat side is to place on the roof.
Make angle cuts to the trims with a miter saw.
Next measure out a choice of your roofing material and place it over the base roof structure.
When attaching ledger board to an existing wall install proper flashing when required.
Use right size of rafters and headers.
Space rafters either 16 o c.
Step 1 make a ledger board to fasten to the existing wall and support the upper end of the lean to roof.
Design lean to roof per your local building codes.