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What are control lines used for in construction?

Updated: Feb 6


In the construction industry, control lines are used to establish reference points that guide the placement of structural elements such as walls, columns, beams, concrete Joints, etc. These lines are typically made from durable materials such as nylon, steel, or masonry string and are stretched tautly between two fixed points on a construction site.

The control lines help ensure that the construction project is built according to the approved plans, specifications and accuracy. By following the control lines, workers can ensure that structural elements are placed in the correct location, at the correct angle, layout and at the correct elevation.

Control lines are especially important in large construction projects where even minor deviations from the plans can result in costly mistakes. They are also used to ensure that the final structure is level, plumb, square and the design comes together as planned.


The process of establishing control lines begins with a survey of the construction site. A surveyor will use specialized equipment to determine the exact location and elevation of key reference points. Once the reference points have been established, control lines are set up between them.

During the construction process, workers use a variety of tools and techniques to ensure that the control lines are followed. For example, a laser level can be used to ensure that walls are built perfectly vertical. A level or transit level can be used to ensure that floors and other horizontal surfaces are level.

Overall, control lines are a critical component of the construction process. They help ensure that the project is built according to the approved plans and specifications, and that the final structure is level, plumb, and square. It’s a good feeling when all your math works and a Plan/Project comes together.




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