1 4 12 Roof Slope

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

1 4 12 roof slope.

Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. The table below shows common roof pitches and the equivalent grade degrees and radians for each. This will give you the rise over run or pitch. 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.

Roof pitch is a term describing how steep or flat your roof slope is. Most roof s have a pitch in the 4 12 to 9 12 range. The combination of two numbers are used to display or show the roof pitch. 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 slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. 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. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

These roofs have a pitch less than 4 12. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Drag sliders to animate the results and diagram. Conventional roofs are the easiest to construct and you can walk on them safely. The triangle diagram will be re drawn to scale with all dimensions marked.

Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. 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. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Pitch angle precision color.