Roof Pitch Roof Area Formula

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

Roof pitch roof area formula.

The slope is the same as the pitch. Roof pitch is given as the number of inches in height change over the distance of one foot. Calculate the roof pitch as the proportion of rise and run. Rafter rise run this formula is from the pythagorean theorem.

For a roof with the ridge above one wall the span is the same as the run. While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12. The formula for the roof pitch multiplier comes from the formula for a right triangle and more specifically the pythagorean theorem. Calculate the rafter length substituting these values into the following formula.

Roof slope pitch rise run area calculation methods. Use the following formula which also describes a right triangle. It is sometimes called the roof pitch multiplier. Dividing by 12 gives the ratio of inches in rise per distance.

Roof pitch degree table. Pitch rise run 1 5 6 25. You can also calculate roof pitch even without using a roof slope calculator. To accurately calculate the area of your roof you must first determine its slope or pitch.

See the image below for more explanation on rise run and pitch. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. What is the roof pitch factor. Here we explain and include examples of simple calculations and also examples of using the tangent function to tell us the roof slope or angle the rise and run of a roof the distance under the ridge to the attic floor and how wide we can build an attic room and still have decent head room.

For example a standard roof pitch is. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Let s say it is equal to 1 5 m. The roof pitch conversion factor is a number that when multiplied by the area covered by the roof gives an estimate the total surface area of the sloped roof itself.

For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. For example 40 feet x 30 feet 1 200 square feet next multiply the area by your roof s pitch. A 12 in 12 pitch is a steep 45 degree angle roof. Multiply your house length by your house width to get the area.

Here are the equations you may use to solve for the length of the slope and the rafter. Measure the rise of your roof.