Site Layout One: Differential Leveling – Module 27401-14

Site Layout One: Differential Leveling – Module 27401-14


Module 27401-14 describes differential leveling—differences in elevation between two or more points on a surface. This module is the first of two modules that focus on site layout.

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Learning Objective 1 – Describe the responsibilities of the carpenter relative to construction drawings, control points, and hand signals.

  • Read and interpret a set of civil plans and how they relate to elevations on a job site.
  • Identify the types of control points and explain their use on a job site.
  • Describe how to use hand signals to communicate.

Learning Objective 2 – Recognize, use, and properly care for tools and equipment associated with differential leveling.

  • Identify the instruments commonly used for differential leveling.
  • Explain how to set up and calibrate a leveling instrument.
  • Explain how to use a builder’s level and differential-leveling procedures to determine site and building elevations.

Learning Objective 3 – Record site-layout data and information in field notes using accepted practices.

Learning Objective 4 – Describe the applications involving differential leveling.

  • Explain how to transfer an elevation up a structure.
  • Discuss applications for profile, cross-section, and grid leveling.

Performance Task

Performance Task 1 – Set up, adjust, and field-test leveling instruments.

Performance Task 2 (Learning Objective 2) – Convert measurements given in feet and inches to equivalent decimal measurements stated in feet, tenths, and hundredths, and vice versa.

Performance Task 3 (Learning Objective 2) – Use a builder’s level, leveling rods, and/or laser level with appropriate differential-leveling procedures to determine site and building elevations.

Performance Task 4 (Learning Objective 3) – Record differential-leveling data in field notes in accordance with accepted procedures.

Performance Task 5 (Learning Objective 4) – Use differential-leveling procedures to transfer elevations up a structure.


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