When establishing batter boards for a foundation layout, what is the primary purpose of the horizontal boards?
Correct Answer
C) To provide reference points for building corners and wall lines
Batter boards with horizontal boards and string lines provide precise reference points for establishing building corners, wall lines, and foundation dimensions during layout. The strings stretched between batter boards represent the actual building lines.
Why This Is the Correct Answer
The horizontal boards on batter boards serve as the foundation for the string line system that defines the building layout. Strings are stretched between these horizontal boards to create precise reference lines that represent the exact location of foundation walls and building corners. This system allows contractors to accurately transfer the building dimensions from the plans to the actual construction site. The intersection points of these string lines mark the exact corners of the building, making this the primary and most critical function of the horizontal boards.
Why the Other Options Are Wrong
Option B: To indicate the finished floor elevation
Utility connections are marked separately on construction drawings and located using different methods. Batter boards are specifically for building layout and foundation positioning, not utility location marking.
Option D: To mark the exact depth of excavation
While batter boards help establish the overall site layout, they do not directly mark excavation depth. Excavation depth is typically determined by measuring down from established grade or benchmark elevations using other methods like laser levels or story poles.
Memory Technique
Think 'BATTER = BETTER reference points' - the horizontal boards create the framework for string lines that give you the BEST reference points for your building layout.
Reference Hint
Look up 'Site Layout and Excavation' or 'Foundation Layout' sections in construction reference materials, typically found in Chapter 3-4 of most construction textbooks.
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