Mark the area where you want the structure.
Lean to roof joists.
Frame the top bottom and sides of the wall using 2x4 lumber and attach joists between the top and bottom every 22 5 inches 57 cm using 3 inch screws.
Measure 8 feet from the existing structure towards the outer direction and dig a deep hole to drive the post in.
Drive the post in and fill the hole with concrete to set it in place.
Find the total rise of the roof using the formula r ps 12 where r is the rise p is the pitch and s is the span.
From this existing post measure 3 feet distance in the same.
In any case the structure.
How to figure the size for trusses on a lean to shelter.
Calculate the length of the top chord with the formula h sqrt r 2 s 2 where h is.
2 screw the add on wall to the top of 1 side of the shed.
The sloped roof of the lean to shed will allow water and snow to run off to one side of the roof without soaking into the wood.
In other words if there is a 1 1 2 ridge board nailed into the wall and the width of the lean to is 96 then the run will be 94 1 2 96 1 1 2 94 1 2.