2 ways to determine or calculate roof pitch or roof slope using a carpenters level

How to determine or calculate roof pitch or roof slope Roof pitch is one of the most used terms in the roofing industry. (Also referred to as roof slope or roof slant) So what does the 7/12 in the example to the right mean? The 7 means that the roof rises 7" for every 12" it runs. The example to right shows 2 different ways to determine or calculate roof pitch, also called roof slope. In Example A, the measurements are taken from on top of the roof. Simply mark a level at 12", hold it perfectly level and measure from the roof surface to your 12" mark, this will give you the rise.   Be careful with this method as a roof with many layers of shingles, or any type of roofing that is irregu...

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