1 4 12 Roof Slope

This will give you the rise over run or pitch.

1 4 12 roof slope.

For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Most roof s have a pitch in the 4 12 to 9 12 range. The triangle diagram will be re drawn to scale with all dimensions marked.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. 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. For example if you measure 4 inches the pitch of your roof is 4 12.

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. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Conventional roofs are the easiest to construct and you can walk on them safely.

These roofs have a pitch less than 4 12. 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. 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. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Pitch angle precision color. 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.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch. Drag sliders to animate the results and diagram. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Roof pitch is a term describing how steep or flat your roof slope is. The combination of two numbers are used to display or show the roof pitch.