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.