Roof Slope Factgore

A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.

Roof slope factgore.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. Charts list the slope factor for various pitches usually from 1 12 to 12 12. For instance if the measurement was 3 your roof slope factor would be 3 12 and you. See below after the table for directions on how to convert any roof slope from one form to another even roof slopes not shown in the table.

The roof slope factor is written as x 12 where x is the vertical distance you measured from roof to level. Also see our page quick reference. Degrees to roof pitch rise in run to see a table. The slope factor works with metric and imperial measurements.

For instance the ever last roofing company distributes a chart to the general public. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Roof pitch calculator roof slope calculator the roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. This will give you the rise over run or pitch.

For example if you measure 4 inches the pitch of your roof is 4 12. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run.

The headache of using pythagoras and trigonometry can be spared by making use of these charts. It s just a little math. You could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts. The roof slope factor chart also consists of conversion factors to determine the slope of the roof.

The combination of two numbers are used to display or show the roof pitch. So a roof with four inches of rise every 12 inches horizontally run would have a slope of 4 12 sometimes displayed as 4 12. The slope of a roof often referred to as the pitch is determined by rise over run the roof s vertical rise in inches for every twelve inches of horizontal length the run. The maths behind this number is that it is the square root of rise run 2 1.