Standard Roof Rise

How do you calculate the slope of a roof.

Standard roof rise.

The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. 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. But the most commonly used pitches range between 4 12 and 9 12. Roof pitch is the measurement of roof steepness.

Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. This article series gives clear examples just about every possible way to figure out any or all roof dimensions and measurements expressing the roof area width length slope rise run and unit rise in inches per foot. You write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

The typical roof slope follows specific materials and design techniques to ensure perfect safety from leakage. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch.

3 12 1 2 12 and 1 4 12. The way pitch also known as roof slope is measured is rise over run. A six inch unit rise means that the roof rises six inches for every 12 inches which is the standard roof cutting basic unit of measurement. Pitch is written assuming a run of a foot or 12 inches so the ratio describes how much the roof rises for every foot of its run.

A common range is given from 1 12 to 4 12 whereas conventional dimensions vary from 4 12 to 9 12 but the steep roofing technique follows slope above 9 12 with additional fasteners. The pitch of a roof is its vertical rise over its horizontal span. This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. For example a roof that rises 4 inches for every 12 inches of run has a 4 12 pitch.

The span of the building is the total width of the building. Step 2 measure the span of the building or consult your blueprints. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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.