You may need a measuring tape to set these points.
How to use a chalk line for roofing.
Secure the line to the wall secure the hook ring on your chalk line to the wall or floor at your starting point.
This technique is good for irregular surfaces and will help prevent unwanted double lines.
To pop long chalk lines accurately when flooring or roofing.
Hammer a nail or drive a screw into one of the end points.
Attach the chalk line at the starting point of the line.
Press down on the string about midway between the ends with your thumb or finger and hold it.
Lift and snap the string on one side and then the other using the technique shown.
To distribute the chalk over your line shake the box several times.
Using white chalk on a white surface won t give you a readable line.
Holding down a chalk line in the middle to pop the line accurately.
The chalk box string is laid across the surface to be marked then snapped sharply causing the string to strike the surface leaving behind a straight chalk line where the surface has been struck.
Here is a quick guide on how to do it.
Pull the string loaded with chalk out of the chalk reel.
The end of the chalk line is tied to a loop or clip.
Using or snapping off a chalk line is simple.