Making a level 65 foot chalk line

[nestsman]

What is the best way to make a level chalk line, along the roof trim, that is 65 feet long? Is it even possible?

Thanks!

[mh_doni49]

You could use a water level (what they it use to level the home) to make two level marks at the ends and then snap your line between the marks.

[nestsman]

Good idea, thanks!

[Greg]

Laser level if you have an unobstructed view down the side of the home.
A line level should put you "Close enough" that you would never notice.

Greg