How To Measure Slope Of Roof

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.

How to measure slope of roof.

This ratio is always expressed as inches per foot. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. It is often compared to slope but is not exactly the same. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

Measuring slope from the roof surface 1. Mark the length with the marker. 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. Keep in mind that this is only usefully accurate for low slope or flat roofs.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Calculate the rafter length substituting these values into the following formula. Climb up a ladder without your tools to take a look at the roof surface. First measure 12 inches from one end of the level and make a mark.

Access one of the rafters then take. Once you have this measurement you can then measure the footprint of the home and estimate the actual roof calculation based on the particular angle of the roof. Calculate the roof pitch as the proportion of rise and run. 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.

For help determining the area of a sloped roof see here. Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. Many levels are equipped with a ruler on.

Measure 12 inches on a carpenter s level. 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. Outside of the u s a degree angle is typically used. 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.

Use a level against the underside of the rafter you re measuring to get the most accurate value. The most precise way to find the roof s slope is by measuring it from the underside. Pitch rise run 1 5 6 25. Measure the rise of your roof.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Locate the level s 12 inch mark. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Let s say it is equal to 1 5 m.