5 lay a framing square at the intersection of the two lines to make sure they meet.
How to make a chalkline on a floor.
With a helper extend the chalk line across the room pull it taut and align it perfectly with the pencil line at the room s center.
If you re installing floor tiles you will often need to mark a straight line that stretches the entire length of the room chalk lines and kits that help you make them are invaluable when you re measuring and marking distances that can t be comfortably measured by a ruler.
Snap the chalk line leaving a straight chalk mark on the subfloor.
Snap the chalk line as before to create a full length reference line through the pencil line.
If the wall is too long to snap the chalk easily kneel by the midpoint of the line and press it down to the floor with one hand.
You ll see how to s.
Watch this video to learn how a pro does it.
Tie the chalk line to the nails so it stretches across the room perpendicular to the line you already snapped.
Be careful not to rub or strike the line against the floor as this will transfer chalk to the floor.
The first job is to make two marks at both the starting point and finishing point of your line so that you have two points to run your chalk line between you can either measure up from the floor or down from the ceiling the choice in yours but before you do make sure which ever surface you re using is level.