8 inches and you have an 8 in 12 pitch.
Roof framing measurements.
On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.
Roof reports and wall reports made easy.
This will the first point of the rafter measurement line.
We ll use satellite imagery and trigonometry to calculate your roof s measurements.
If this distance measures 4 inches you have a 4 in 12 pitch.
Measure down y height from the long point of the rafter cut and make a mark.
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.
This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.
Roof framing rafter layout.
Make sure to document the number of chimneys skylights or other obstructions and include dormers in your measurements.