Gambrel Roof Pitch Angles

A gambrel roof is a popular roof style on many contemporary barns and sheds.

Gambrel roof pitch angles.

The combination of two numbers are used to display or show the roof pitch. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. Gambrel roofs are symmetrical with two slopes on each side of the roof. Gambrel roof framing geometry calculator metric this gambrel roof confines to a semicircle and starts as the top half of an equal sided octagon.

Determine a pitch for the top slope of the gambrel roof the rise in inches per foot from the midpoint connection to the peak. 7 12 or a rise of 7 inches per foot is a common top gambrel pitch. With the gambrel roof design there are four angles that are used to make up a total of 180 degrees. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Depending on the size of the roof and the pitch of the roof these angles will change. This means that for every 12 horizontal run you must have at least 3 of rise. Gambrel roof framing geometry calculator inch this gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. To calculate a gambrel roof select gambrel roof from the roof type dropdown list or click on the appropriate toolbar button to calculate a.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. You want to try and use angles that are as close to 45 as you can get for both ease of construction and good strength. If you plan on building and installing your own gambrel roof you ll have to draw out plans first to determine the proper dimensions.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. Besides its unique appearance a gambrel roof also serves to maximize the usable floor space in the attic area. Anything less than this will ultimately result in a roof that leaks if you plan on putting shingles on it. 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.

A gambrel or barn style roof is simply a gable roof with a change in slope partway up the roof. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.