What is the slope of the roof as described in the example, in inches per foot?

• A. 5 inches per foot
• B. 6 inches per foot
• C. 7 inches per foot
• D. 8 inches per foot

Answer: (C)

Slope in inches per foot tells you how much the roof rises for each horizontal foot of run. In roofing terms, you’re looking at inches of rise for every 12 inches of run, which is one foot. If the example shows a rise of 7 inches for every 12 inches of run, then the roof climbs 7 inches for each 1 foot of horizontal distance. That makes the slope 7 inches per foot (often written as 7:12). So the correct result is a rise of 7 inches per foot.