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Insight Horizon Media

How does a Mason line work?

Author

Emma Martin

Published Feb 27, 2026

How does a Mason line work?

A mason’s line, also called a Mason’s twine, is used to create straight lines and a level surface. It is needed when laying out posts, patios, footings and more. A mason’s line is necessary when doing these projects because you will not have to pick up the level so many times.

What is masonry twine?

Braided Nylon Mason’s Line is a product used everyday by the professional brick mason. Also known as mason’s twine, it does not get the credit it deserves. This speeds the job and, if used correctly, can give you a straight line for accuracy when laying bricks or blocks.

What’s a string line?

A string line is one of the oldest and most basic of hand tools, and it is commonly used in masonry and carpentry to help the user create a straight line between two reference points. A string level can also be used to create a straight, level horizontal line. A chalk line is another version of this tool.

How strong is Mason line?

With a test strength of approximately 160 lbs., this line is more than up to the job of holding a straight, sag-free line to keep your masonry straight and level, but that’s just the beginning.

What is a line block used for?

A line block is a small, roughly “L” shaped block with specially made grooves to which you can secure a brick line. Line blocks are frequently used by bricklayers (in conjunction with a brick line) as an aid to keeping brick walls horizontally level as they are constructed.

What is twisted Mason line used for?

Twisted Mason Twine is used to quickly and accurately ensure mason is level. It is rot proof, resists oil, gasoline and most chemicals. For contractor, carpenter, mason or home use. Warning: Do not use in situations where personal safety could be endangered.

How do you make sure a string line is level?

Hold the end of the string against the post or wall and adjust up and down until the bubble rests between the black lines on the line level. Secure the string. You have found level between the two points. You can use these marks on the posts or walls to make further measurements for your home construction projects.

How thick is Mason line?

Choose between pre-cut lengths of 250 feet, 500 feet, or 1000 feet. SGT KNOTS Nylon Mason Line diameter thickness option: #18 (1.52mm | 0.060 inch)….LENGTH / WIDTH / COLOR.

Twisted Nylon Mason LineBraided Nylon Mason Line
Diameter (inch)#18 (1.52mm / 0.060 in)#18 (1.52mm / 0.060 in)

How accurate is a line level?

A more advanced device may be accurate to within 0.3 mm/m; while lower-end models may be closer to 1.5 mm/m. The illuminated line is necessarily absolutely straight, so that the line level can be used as a straightedge; for example, to see if a shelf is warped, even if not horizontal.

What happens when you block someone line?

When you block an account on LINE: You’ll no longer be able to receive chat messages or voice/video calls from that account. It will appear in Blocked users instead of your friend list. Blocking an account doesn’t completely remove it as a friend or friend recommendation.