What does roof slope mean and why is it important?

What does roof slope mean and why is it important?

Roof slope is generally expressed in the form of vertical rise:horizontal run.  As an example, a roof could rise 5 inches for each 12 inches of horizontal distance.  This would be a roof with a slope of 5:12.  Roof slope is important because the slope dictates how the roof is applied.  The standard application practices detailed in the PABCO® Directions For Application are intended for roofs with a slope between 4:12 and 20:12.  Special application practices (also found in the PABCO® Directions For Application) are used if the slope is lower or steeper.

Do not use PABCO® shingles if the slope is less than 2:12.

See the PABCO® Directions For Application for additional details and related information.