What is a common method for determining the slope of a roof?

The most effective method for determining the slope of a roof is to use a level and measure the rise over a specific run. This technique directly assesses the vertical height (rise) of the roof relative to a horizontal distance (run), providing a clear ratio that defines the roof's slope.

By positioning a level along the roof and noting how much the roof rises over a certain horizontal distance, roofers can accurately calculate the slope, often expressed in terms such as "rise in inches per foot of run." This method is widely utilized in the roofing industry as it allows for precise adjustments and ensures proper drainage, which is crucial for preventing water accumulation and potential damage.

Other techniques, such as using a compass or measuring the perimeter, do not provide the direct slope measurement needed for roofing calculations. Calculating the area of the roof may offer useful information about coverage and material requirements but does not contribute to understanding the roof's slope.