How To Measure Slope Of Roof

Locate the level s 12 inch mark.

How to measure slope of roof.

First measure 12 inches from one end of the level and make a mark. Use a level against the underside of the rafter you re measuring to get the most accurate value. Climb up a ladder without your tools to take a look at the roof surface. And even flat roofs usually have a little bit of a slope so you might want to use a roof pitch multiplier once you have your area figured out 1.

Measure the rise of your roof. This ratio is always expressed as inches per foot. It is often compared to slope but is not exactly the same. Slope is the incline of the roof expressed as a ratio of the vertical rise to the horizontal run where the run is some portion of the span.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run. Calculate the rafter length substituting these values into the following formula. Measure 12 inches on a carpenter s level. For help determining the area of a sloped roof see here.

How to determine or calculate roof pitch or roof slope roof pitch calculator is determined by the number of inches it rises vertically for every 12 inches it extends horizontally. Confirm the roof is safe to walk on. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

The most precise way to find the roof s slope is by measuring it from the underside. Access one of the rafters then take. Keep in mind that this is only usefully accurate for low slope or flat roofs. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

Outside of the u s a degree angle is typically used. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. How do you calculate the slope of a roof. Let s say it is equal to 1 5 m.

Measuring slope from the roof surface 1. Calculate the roof pitch as the proportion of rise and run. Many levels are equipped with a ruler on. Mark the length with the marker.

If you re going to use an area calculator you can do this separately for each level of the home to ensure a more accurate calculation. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean. Pitch rise run 1 5 6 25.