Standard Hip Roof Angles

The british standard for tilling and slating provides specific guidance about double lapped slating where calculations and recommendations for pitch and lap of slate are based on.

Standard hip roof angles. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. This style of roofing became popular in the united states during the 18 th century in the early georgian period. Types of hip roofs. The hip roof is the most commonly used roof style in north america after the gabled roof.

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Pitches above 9 12 are very highly angled and are designated steep slope roofs. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. The most common hip roof pitch ratios fall between 4 12 and 6 12 although variations occur based on factors such as snow rain and wind conditions which is because steeper hip roof pitch ratios allow for less accumulations of snow and rain on the roof and lower ratios provide less wind resistance.

Using these angle definitions i will derive formulas for the sheathing θ s and hip pitch angle θ h given the common pitch angle which i call the roof pitch θ r and plan angle θ p. The most common type of a hip roof. The sides come together at the top to form a simple ridge. 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.

A hip roof or a hipped roof is a style of roofing that slopes downwards from all sides to the walls and hence has no vertical sides. Use separate hip roofs on homes with different wings. To derive formulas for the critical angles we need to define some terms which i do in figure 2. Similar to a cross gable roof.

While the slope of the common rafters are expressed as x in 12 the slope of the hip and valley rafter on the same roof will be x in 16 97 so where two roof sections intersect to form a 90 angle a regular hip or valley and each roof. The most commonly used roof pitches fall in a range between 4 12 and 9 12. Making decision about roof pitch. The line where the two roofs meet is called a valley.

The roof pitch is described by the vertical rise divided by horizontal span. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Modern residential hip roof construction uses common pitch ratios in general. On a related note the pitch properly the slope of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections.

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. Hip roof framing hip to common to ridge join diagram. The combination of two numbers are used to display or show the roof pitch.