This means that for every 12 horizontal run you must have at least 3 of rise.
Shed roof dimensions.
8 8 8 12 8 16 and 8 20 sizes available.
You want the ridge of the gable to be 2 feet.
When you are designing your shed roof whether it be a gambrel gable or saltbox you should never have any roof pitch less than a 3 12.
That gives us rise over run of 2 4.
The preview window displays a dimensioned side view of the shed roof.
Since the ridge of our gambrel roof will run the length of the shed down the center that leaves us with about 4 horizontal feet from the ridge to the outside edge of the shed.
Anything less than this will ultimately result in a roof that leaks if you plan on putting shingles on it.
Don t forget to cut the ends of each board to the appropriate angle to allow them to fit together at the peak.
To calculate a shed roof select shed from the roof type dropdown list or click on the corresponding button on the toolbar to calculate a shed roof.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
The advantages to sourcing this product through tuff shed include quicker turnaround time delivery of the units fully assembled and the ability to purchase in single unit quantities.