This will the first point of the rafter measurement line.
Roof framing measurements.
From one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it.
Roof reports and wall reports made easy.
How to calculate your roof square footage first measure the length and width of each surface on the roof then multiply these values to get the square footage of that surface.
Pitch measurement method 1.
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 framing rafter layout.
Measure down y height from the long point of the rafter cut and make a mark.
8 inches and you have an 8 in 12 pitch.
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.
Make sure to document the number of chimneys skylights or other obstructions and include dormers in your measurements.