1 4 12 Roof Slope

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

1 4 12 roof slope.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. The combination of two numbers are used to display or show the roof pitch. They have a pitch ranging from 4 12 to 9 12. 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.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. Conventional roofs are the easiest to construct and you can walk on them safely. Most roof s have a pitch in the 4 12 to 9 12 range. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. The table below shows common roof pitches and the equivalent grade degrees and radians for each. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. Drag sliders to animate the results and diagram.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. This will give you the rise over run or pitch.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. For example if you measure 4 inches the pitch of your roof is 4 12.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. These roofs have a pitch less than 4 12. The triangle diagram will be re drawn to scale with all dimensions marked. Pitch angle precision color.

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. 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.