Here is a quick guide on how to do it.
How to use a chalk line for roofing.
Tap the chalk box occasionally to settle the chalk.
When the compartment is filled with chalk the string in the coil becomes coated in the chalk.
Repeat this on both sides of the roof.
Fill the chalk box about half full with powdered chalk from a squeeze bottle.
Mark the two end points of the line you are trying to draw.
Every 5 inches make a new mark until you get to the rop of the roof.
The end of the chalk.
You ll have a choice of red blue white or fluorescent chalk.
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How to use a chalk line.
The best way to load chalk into a chalk line.
Using or snapping off a chalk line is simple.
You may need a measuring tape to set these points.
These chalk lines will serve as a guide for subsequent even numbered rows of shingles and odd numbered rows respectively.
Fill your chalk box with blue chalk for general use.
Snap a vertical chalk line from the inside edge of the first shingle on the second row to the top of the roof and from the inside edge of the first shingle to the top of the roof.
Marking straigh level lines with a spirit level can be a little tedious using a chalk line however can make things decidedly more simple.