What’s the Difference Between Masonry Line and Leveling Line?

The differentiation between a masonry line and a leveling line serves as a fundamental yet intricate aspect within the realm of construction and building projects. While these two lines are inherently related, they offer distinct functionalities that cater to specific needs and requirements in the field. A masonry line, also known as a brick line or a string line, is primarily employed to ensure precision and straightness in the alignment of bricks or blocks during the construction of walls, fences, or any other brick-related structures. On the other hand, a leveling line is employed to determine and maintain a consistent height or level throughout the construction project, allowing for uniformity and stability.

What Is Masonry Line Used For?

Instead, it remains taut and firm, ensuring that your work remains precise and accurate. This allows for a more efficient and streamlined construction process as you can work confidently knowing that your lines are straight and level.

Masonry line is typically made from strong and durable materials like nylon or polyester, making it resistant to wear and tear. It can withstand the rigors of construction work, including exposure to harsh weather conditions and rough handling. This durability ensures that the line won’t break or snap easily, providing reliable support for your construction needs.

One of the main uses of masonry line is in bricklaying. When building a brick wall, it’s crucial to have straight and level rows of bricks. Mason line acts as a guide to ensure that each row is aligned correctly, resulting in a sturdy and aesthetically pleasing structure. The line is stretched between two points on the wall and acts as a reference point for brick placement.

These projects require precision and accuracy to ensure that the end result isn’t only visually appealing but also structurally sound. Masonry line helps maintain consistency and uniformity throughout the construction process.

How to Properly Use Masonry Line in Bricklaying

  • Gather all the necessary tools and materials.
  • Prepare the area where you’ll be working.
  • Start by spreading a layer of mortar on the foundation or base.
  • Place the first brick carefully on top of the mortar, ensuring it’s level and plumb.
  • Apply mortar to the sides of the first brick.
  • Place the second brick alongside the first, leaving a small gap for the mortar.
  • Tap the second brick gently with a trowel handle to align it with the first brick.
  • Continue adding bricks in the same manner, staggering the joints for added strength.
  • Check the level and plumb after every few rows of bricks.
  • Use a masonry line to ensure straight and even rows.
  • Tie the masonry line securely to the ends of the wall to keep it taut.
  • Guide the bricks against the line as you lay them, adjusting as necessary.
  • Remove any excess mortar with a trowel or brush.
  • Allow the mortar to dry and cure before applying any additional layers or finishes.
  • Clean up the work area and tools once you’ve finished.
  • Inspect the finished brickwork for any imperfections and make necessary adjustments.

Masonry line, a crucial tool for professional masons, is typically made from #18 twine composed of 100% Nylon filament. This versatile material offers exceptional durability and strength, ensuring reliable performance on construction sites. Mason lines are available in two variants: twisted twine and braided twine. While both serve their purpose admirably, the braided twine possesses the advantage of being less prone to unraveling when cut.

What Is Masonry Line Made Of?

The main component of a masonry line is the twine, which is typically made from 100% Nylon filament. This material is chosen for it’s strength and durability, both essential qualities for a mason line. The Nylon filament ensures that the line can withstand the rigorous demands of masonry work, resisting fraying, stretching, and breaking.

Mason lines are available in two different types: twisted and braided. This twisting process helps to enhance the overall strength and resilience of the line. However, one drawback of twisted mason lines is that they’re more prone to unraveling when cut.

This braiding technique ensures that the line won’t easily unravel when cut, making it a preferred choice for masons who require a reliable and long-lasting line.

Twisted lines are generally easier to handle and tie knots with, while braided lines offer increased resistance to unraveling and overall longevity.

Regardless of the chosen type, mason lines are essential tools for ensuring precise and accurate masonry work.

Source: Mason Lines – Braided & Twisted – Brownell Twines


While both lines serve the purpose of ensuring accuracy and alignment in building projects, they differ in their methodology and usage. Understanding these disparities is crucial for builders, contractors, and construction professionals to ensure the successful execution of their projects, accounting for the intricacies of each approach.

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