Roof Slope 3 12

The table below shows common roof pitches and the equivalent grade degrees and radians for each.

Roof slope 3 12.

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. If a roof rises 3 in a length of 12 this is 3 12 roof pitch. We included a roof pitch chart below the 7 12 example image and the calculator below that. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Roof pitch defined and explained. 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. I e 4 inches of rise per 12 inches one foot of run.

This will give you the rise over run or 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. For example if you measure 4 inches the pitch of your roof is 4 12. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.

The combination of two numbers are used to display or show the roof pitch. Roof slopes are most commonly defined by the rise over run ratio. 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. If this isn t practical then perform the same measurement on the underside of the roof.

Pitch is the term used to describe the angle slope or slant of your roof. Roof pitch degree table. What exactly is roof slope. A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain.

Or the colon can replace the slash as in 2 12 or 7 12. The fraction 4 4 equals 1 so it doesn t change the value of the pitch and it produces a pitch of 4 12. Image 1 12 to 12 12 roof pitch 7 12 pitch. 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.

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 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.