The most precise way to find the roof s slope is by measuring it from the underside.
How to measure slope of roof.
Calculate the roof pitch as the proportion of rise and run.
Calculate the rafter length substituting these values into the following formula.
Access one of the rafters then take.
Locate the level s 12 inch mark.
A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.
Measuring slope from the roof surface 1.
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.
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.
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.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
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.
Confirm the roof is safe to walk on.
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.
Keep in mind that this is only usefully accurate for low slope or flat roofs.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.
Let s say it is equal to 1 5 m.
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.
Pitch rise run 1 5 6 25.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
First measure 12 inches from one end of the level and make a mark.
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.
Climb up a ladder without your tools to take a look at the roof surface.
Measure 12 inches on a carpenter s level.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
Measure the rise of your roof.
Outside of the u s a degree angle is typically used.
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.
Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean.
Many levels are equipped with a ruler on.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
