House Roof Pitch Angle

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

House roof pitch angle.

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. Divide the first part of the ratio by 12 to work out the pitch. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. Usually average roof pitch is determined using the same roof length method.

The rafter length is 3 4 the span about 48. Pitches above 9 12 are very highly angled and are designated steep slope roofs. To convert between american roofing ratios and pitch degrees follow these steps. The rafters equal the span 60.

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. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16. The combination of two numbers are used to display or show the roof pitch.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. 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. Commonly used roof pitches were given names such as greek.

Roof pitch in layman s language simply refers to the steepness of the roof. There are different kinds of roofs and all these have particular specifications for their installation. The most commonly used roof pitches fall in a range between 4 12 and 9 12. Simply put roof pitch is the measurement of the angle or the steepness of your roof.

A 12 12 pitch roof has a pitch angle of 45. Roof pitch is a term describing how steep or flat your roof slope is. Roof pitch refers to the slope which the rafter creates. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

The ridge height is 2 9ths to 1 3 the span an angle of 24 to 34. Because it is one of the many key elements that determine the safety of the roof over your head there is a very good reason to understand the purpose of roof pitch. The pitch of a roof is arrived at by dividing the vertical rise and its horizontal span or what people in the roofing industry would refer to as the slope. Roof pitch angle and slope factor charts.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.