The pitch of your roof is a determining factor when it comes to the cost of replacement and even the type of material that should be on your roof. For example, if your roof has a pitch that is too low then shingles might not be the way to go. You would likely need a material for flat roofs.
The angle, or pitch, of a roof, is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of the horizontal run has a 6-in-12 pitch. Here’s an easy, safe way to determine the pitch from inside your attic: