4 12 Roof Pitch Meaning

As a reminder please don t forget to add height of rafter thickness of roofing material and ridge vent to the number that you ll get using our calculator.

4 12 roof pitch meaning. The pitch of a roof is its vertical rise over its horizontal span. So a roof pitch of 10 12 as seen below means for every 12 horizontal inches of roof the roof rises 10 inches. 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. Simply mark a.

A 12 to 24 pitch is expressed as 1 2. The 4 12 pitch is a roof that rises vertically toward the peak 4 inches for every 12 inches of horizontal run. The gentle slope of a 4 12 pitch roof falls. The first is from the top of the roof.

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. The table below shows common roof pitches and the equivalent grade degrees and radians for each. There are two suggested ways to measure a 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. For example given a roof with a rise of 4 feet and a span of 24 feet the pitch is 1 to 6 pitch which can be expressed as the fraction of 1 6. The term pitch and slope are often used interchangeably which is incorrect. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

Roof pitch or slope tells you how many inches the roof rises for every 12 inches in depth. This is a steep slope roof. An example of a roof pitch would be a 6 12 pitch which means that the roof rises 6 for every 12 inward towards the peak or ridge. However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. If you ever wondered how to figure your overall building height or roof height here we have a calculator to make life a little easier for you. Layout step 1 measure the width of your side walls at the top from outside to outside using a tape measure. Add at least 12 inches to either side for eaves which are typically 12 to 36 inches depending on the style of the structure.