When setting up batter boards for a building layout, what is the primary purpose of the horizontal boards?
Correct Answer
D) To hold string lines that define building corners and wall locations
Batter boards hold string lines that define the exact location of building corners and wall lines. This allows for accurate layout and the ability to re-establish layout lines if they are disturbed during construction.
Why This Is the Correct Answer
The horizontal boards on batter boards serve as anchor points for string lines that precisely define the building's layout. These string lines mark the exact location of building corners and wall centerlines, creating an accurate reference grid for construction. The strings can be easily removed during excavation and re-established using the same batter boards, ensuring consistent layout throughout the construction process. This system allows contractors to maintain precise building dimensions and square corners even when the original layout stakes are disturbed.
Why the Other Options Are Wrong
Option A: To establish the building's elevation above sea level
While batter boards are used during the layout phase before excavation, they do not directly mark excavation depth. Excavation depth is typically marked using grade stakes, laser levels, or story poles that reference the established grade elevations.
Option C: To provide reference points for foundation wall height
Building elevation above sea level is established through surveying and benchmarking processes that reference known elevation points. Batter boards are temporary layout tools that work with relative elevations and horizontal positioning, not absolute elevations above sea level.
Memory Technique
Think 'BATTER = BETTER strings' - the horizontal boards make it BETTER to string up accurate building lines that can be repeatedly referenced throughout construction.
Reference Hint
Look up 'Site Layout and Excavation' or 'Building Layout Procedures' in your construction reference manual, typically found in the site preparation or foundation chapters.
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