During building construction, a roof may be flat or pitched. The pitch is the slope or the angle of a roof is calculated by measuring the number of inches the roof rises vertically for each foot (12 inches) it extends horizontally. If a roof rises 8 inches for every 12 inches of run horizontally then it has an 8-in-12 pitch. It’s important to know the pitch of one’s roof when installing skylights, cutting new rake boards or even adding an addition.
The safest way to measure your pitch is from the inside of the attic. Measure 12 inches from one end of a level against the bottom of the roof rafter making sure to hold it perfectly level. Next, measure vertically from that 12-inch mark from the level to the underside of the same rafter. The second measurement is the number of inches that your roof rises by 12 inches.
The pitch is important because of the type of roofing material that is used as well as the proportion to the building as a whole, which determines the style of the pitch too. Pitch helps to redirect snow or water. Ultimately, a pitch is greater in areas that have either high snowfall or a rainy season.
A professional home building will determine the correct pitch for a home’s climate.