Adjust the square until the level is level. Place your pencil in speed square s so called diamond cutout for 3 1 2 inches or in one of the ten notches located in the triangular cutout for 3 8 inch to 3 inches.
The most common use of a speed square is creating a square line.
How to use a speed square. Place the pivot point against the shingles. You can hold the square either from the top or bottom really just personal preference we both typically hold it from the top. Then if you need to mark a straight line follow the straight edge of the speed square with a pencil.
Read the pitch on the side of the speed square. Simply hold the square against the long edge you can draw a straight square line. To use a speed square for marking lines start by taking the lipped fence of the speed square and placing it flush with the edge of the surface you re marking.
The pitch tells you the amount of vertical rise in inches for every 12 inches of run. Use a regular pencil not a carpenter s pencil. Slide the square down the length of the board drawing the line as you go.
Then place a torpedo level on the fat base of the speed square.