1 2 Roof Pitch

A 12 to 24 pitch is expressed as 1 2.

1 2 roof pitch.

The pitch can be expressed numerically as a fraction. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42. A ratio of the ridge height to the width of the building span and as a ratio of the rafter length to the width of the building. If a roof rises 2 in a length of 12 this is 2 12 roof pitch.

Roof pitch defined and explained. For example given a roof with a rise of 4 feet and a span of 24 feet the pitch is 1 to 6 pitch which can be expressed as the fraction of 1 6. Or the colon can replace the slash as in 2 12 or 7 12. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16.

Roof pitch designations are comprised of two numbers indicating a ratio. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. You can go by the measurements taken by walking the roof. The maths behind this number is that it is the square root of rise run 2 1.

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. Most roof s have a pitch in the 4 12 to 9 12 range. Pitch is the term used to describe the angle slope or slant of your roof. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.

2 12 roof pitch angle 9 46 degrees. Commonly used roof pitches were given names such as greek. Since this is a flat roof or nearly flat roof. The pitch fraction represents a certain amount of vertical rise over the entire span.

A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The combination of two numbers are used to display or show the roof pitch. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

0 pitch 1 00x the roof area. Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Historically roof pitch was designated in two other ways.