1 4 12 Roof Slope

Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.

1 4 12 roof slope.

Drag sliders to animate the results and diagram. 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. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Roof pitch is a term describing how steep or flat your roof slope is.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. The combination of two numbers are used to display or show the roof pitch. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. 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. They have a pitch ranging from 4 12 to 9 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each.

The triangle diagram will be re drawn to scale with all dimensions marked. Most roof s have a pitch in the 4 12 to 9 12 range. These roofs have a pitch less than 4 12. 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. 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. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Conventional roofs are the easiest to construct and you can walk on them safely. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. For example if you measure 4 inches the pitch of your roof is 4 12.

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.