1 2 Pitch Roofing

Pitch is the term used to describe the angle slope or slant of your roof.

1 2 pitch roofing.

Their fasteners are either concealed or screwed at the top of a ridge which makes them less likely to leak. Most roof s have a pitch in the 4 12 to 9 12 range. A 12 to 24 pitch is expressed as 1 2. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.

The maths behind this number is that it is the square root of rise run 2 1. 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. 0 pitch 1 00x the roof area. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Definitions vary on when a roof is considered pitched. 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.

You can go by the measurements taken by walking the roof. 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. The pitch can be expressed numerically as a fraction. Or the colon can replace the slash as in 2 12 or 7 12.

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. Thus pitch is typically greater in areas of high rain or snowfall. The exact roof slope in degrees is given by the arctangent. In degrees 10 2 in 12 or 1 in 6 is considered a minimum.

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. Roof pitch designations are comprised of two numbers indicating a ratio. Since this is a flat roof or nearly flat roof. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow.

But the taller profiles like standing seam and pbr shown below can be installed on roofs with as low as 1 4 or 1 2 in 12 pitch.