Calculates the dimensions of a gambrel roof based on user inputs.
Start with your values, or try a preset.
Enter Building Width, Upper Roof Pitch (rise/run), Lower Roof Pitch (rise/run), Overall Roof Height, and Eave Overhang in the units shown.
Read Half Building Width, Lower Rafter Length, Ridge Height, Upper Rafter Length, Total Rafter Length (per side), and Roof Area (per side) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Building Width: 12 ft; Upper Roof Pitch (rise/run): 4 in/ft; Lower Roof Pitch (rise/run): 12 in/ft; Overall Roof Height: 10 ft; Eave Overhang: 1 ft
Half Building Width: 6 ft; Lower Rafter Length: 8.485281374 ft; Ridge Height: 4 ft; Upper Rafter Length: 6.32455532 ft; Total Rafter Length (per side): 14.80983669 ft; Roof Area (per side): 177.7180403 sq ft
Building Width: 24 ft; Upper Roof Pitch (rise/run): 6 in/ft; Lower Roof Pitch (rise/run): 12 in/ft; Overall Roof Height: 16 ft; Eave Overhang: 1 ft
Half Building Width: 12 ft; Lower Rafter Length: 16.97056275 ft; Ridge Height: 4 ft; Upper Rafter Length: 13.41640786 ft; Total Rafter Length (per side): 30.38697061 ft; Roof Area (per side): 729.2872947 sq ft
Building Width: 40 ft; Upper Roof Pitch (rise/run): 8 in/ft; Lower Roof Pitch (rise/run): 12 in/ft; Overall Roof Height: 24 ft; Eave Overhang: 2 ft
Half Building Width: 20 ft; Lower Rafter Length: 28.28427125 ft; Ridge Height: 4 ft; Upper Rafter Length: 24.0370085 ft; Total Rafter Length (per side): 52.32127975 ft; Roof Area (per side): 2,092.85119 sq ft
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