Roof Pitch Multiplier Metric

The main navigation tabs at top of each page are metric versions of calculators.

Roof pitch multiplier metric. For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.

Multipliers for common roof pitches that can be used to find the total area of a roof. 100 1 054 105 4ft 2. In construction the roof pitch can be known as stair while in trigonometry it is known as the tangent function. 48 10 4 8.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive. Roof pitch area multipliers. For example a 4 12 pitch roof that is 100 square feet.

Also the multiplier is so close to one that it does not really change the total size unless your roof is something like a 100 100. Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. Roofs with pitch over 12 are not very common and besides you can now calculate it yourself. In us instead of the whole run 12 inch is.

The pitch of this roof is 4 8 12. With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof. Both metric and imperial measurement systems are displayed in a popup menu over the results area. Roof pitch refers to the slope which the rafter creates.

If there s an inch version directly under the main tab is a smaller inch tab for the feet and inch version. Accurate roof calculations are achieved using this table and all you need to do is measure the roof width and length and then you are ready to do a roof pitch measurement. The maths behind this number is that it is the square root of rise run 2 1. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory.

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. With a single pitch roof you ll have only one area result that relates to the entire footprint or perimeter of the roof. Pitch is expressed as a degree or percentage in countries that use the metric system while in countries that use imperial measurement pitch is expressed with rise first and run second. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.