For help determining the area of a sloped roof see here.
How to measure slope of roof.
Calculate the roof pitch as the proportion of rise and run.
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.
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.
Let s say it is equal to 1 5 m.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
Measure 12 inches on a carpenter s level.
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.
Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean.
Climb up a ladder without your tools to take a look at the roof surface.
Confirm the roof is safe to walk on.
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.
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.
Measuring slope from the roof surface 1.
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.
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.
Locate the level s 12 inch mark.
Measure the rise of your roof.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
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.
Keep in mind that this is only usefully accurate for low slope or flat roofs.
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.
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.
Pitch rise run 1 5 6 25.
First measure 12 inches from one end of the level and make a mark.
This ratio is always expressed as inches per foot.
A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.
Access one of the rafters then take.
How do you calculate the slope of a roof.
