The slope of a roof is expressed as a fraction by placing the _____ over the ____.

The slope of a roof is primarily defined by the relationship between its rise and run. In roofing terminology, the rise refers to the vertical distance that the roof ascends, while the run describes the horizontal distance over which that rise occurs. When these two values are expressed as a fraction, the rise is placed over the run. This ratio is essential because it provides a clear representation of how steep the roof is, which is critical for proper water drainage and overall structural integrity.

This method of expression allows builders and carpenters to communicate the pitch of the roof effectively, ensuring that roofs are constructed to appropriate angles for both functionality and aesthetic appeal. Understanding this relationship is fundamental in carpentry and roofing, as it directly impacts the design, materials needed, and methods employed in constructing roof structures.