A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.
How to measure slope of roof.
How do you calculate the slope of a roof.
Outside of the u s a degree angle is typically used.
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.
Many levels are equipped with a ruler 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.
Calculate the rafter length substituting these values into the following formula.
Confirm the roof is safe to walk on.
First measure 12 inches from one end of the level and make a mark.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
Calculate the roof pitch as the proportion of rise and run.
Climb up a ladder without your tools to take a look at the roof surface.
Measure the rise of your roof.
Let s say it is equal to 1 5 m.
Locate the level s 12 inch 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.
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.
Keep in mind that this is only usefully accurate for low slope or flat roofs.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
Access one of the rafters then take.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 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.
Measuring slope from the roof surface 1.
This ratio is always expressed as inches per foot.
Mark the length with the marker.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.
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.
For help determining the area of a sloped roof see here.
It is often compared to slope but is not exactly the same.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
Measure 12 inches on a carpenter s level.
