Commonly it is 3 4 th of span as per gothic rafter must be equal to span.
Ranch house roof pitch.
Usually average roof pitch is determined using the same roof length method.
Greek says one must keep rafter length in range of 1 9 to 1 7 th of span but as per roman style the standard dimensions are kept about 1 3 to 2 9 th of span with an angle of 23 to 24 degree.
Hipped roofs are also common which offer a slightly different design and lower pitch.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
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.
Both could be called a ranch house.
Roof pitches can be as high as 12 12 according to the mhimperialhome website.
The one on top has a roof pitch of 1 2.
The most commonly used roof pitches fall in a range between 4 12 and 9 12.
The one on the bottom has a roof pitch of 3 4.
Gable roofs offer the advantages of easily shedding rain and snow in cold climates.
Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.
Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.
Gable roofs on ranch style homes can have a variety of pitches from low to steep.
Compare these next two houses.