Roof Slope 3 12

Roof pitch designations are comprised of two numbers indicating a ratio.

Roof slope 3 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. Image 1 12 to 12 12 roof pitch 7 12 pitch. Roof slopes are most commonly defined by the rise over run ratio. Roof pitch defined and explained.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch is a term describing how steep or flat your roof slope is. This will give you the rise over run or pitch.

For example if you measure 4 inches the pitch of your roof is 4 12. However from the wind uplift mitigation perspective a 7 12 roof slope can be considered as a two story building due to the higher overall steepness and profile of the roof. I e 4 inches of rise per 12 inches one foot of run. 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.

3 12 roof pitch angle 14 04 degrees. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. Roofers like to express the roof pitch ratio in inches and for simplicity they always use a run of 12 inches. The fraction 4 4 equals 1 so it doesn t change the value of the pitch and it produces a pitch of 4 12.

A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain. What exactly is roof slope. To express a slope of 1 3 as a roof pitch you would multiply by 4 4 to produce 12 in the denominator of the ratio. The combination of two numbers are used to display or show the roof pitch.

If a roof rises 3 in a length of 12 this is 3 12 roof pitch. The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Most roof s have a pitch in the 4 12 to 9 12 range.

Or the colon can replace the slash as in 2 12 or 7 12. Roof pitch degree table.