How To Measure Slope Of Roof

Calculate the rafter length substituting these values into the following formula.

How to measure slope of roof. Locate the level s 12 inch mark. Use a level against the underside of the rafter you re measuring to get the most accurate value. Many levels are equipped with a ruler on. Measure 12 inches on a carpenter s level.

Measure the rise of your roof. Climb up a ladder without your tools to take a look at the roof surface. Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

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. Keep in mind that this is only usefully accurate for low slope or flat roofs. 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. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

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. Pitch rise run 1 5 6 25. Calculate the roof pitch as the proportion of rise and run. Outside of the u s a degree angle is typically used.

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. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. First measure 12 inches from one end of the level and make a mark. Access one of the rafters then take.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Let s say it is equal to 1 5 m. 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.

The most precise way to find the roof s slope is by measuring it from the underside. How do you calculate the slope of a roof. This ratio is always expressed as inches per foot. For help determining the area of a sloped roof see here.

It is often compared to slope but is not exactly the same. Measuring slope from the roof surface 1. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. 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.