When establishing batter boards for a rectangular foundation, what is the primary method to ensure the corners are square?
Correct Answer
C) Apply the 3-4-5 triangle method
The 3-4-5 triangle method (or multiples like 6-8-10) is the standard field technique for ensuring 90-degree corners when laying out foundations. This method uses the Pythagorean theorem to create perfect right angles.
Why This Is the Correct Answer
The 3-4-5 triangle method is the most reliable and practical field technique for ensuring square corners when setting batter boards. This method applies the Pythagorean theorem (3² + 4² = 5²) to create a perfect 90-degree angle without requiring expensive surveying equipment. It's the standard practice taught in construction because it's accurate, quick, and can be done with just a measuring tape.
Why the Other Options Are Wrong
Option A: Check that opposite sides are equal
Checking that opposite sides are equal only verifies that you have a parallelogram, not necessarily a rectangle - the corners could still be acute or obtuse angles rather than 90 degrees
Option D: Use a transit to measure angles
A magnetic compass determines direction/orientation but cannot ensure that corners are square (90 degrees) - it only shows compass bearings
Memory Technique
Remember '3-4-5 makes corners fly' - this Pythagorean triple is the fastest way to check if foundation corners are truly square
Reference Hint
Florida Building Code, Chapter 18 - Soils and Foundations, or construction layout sections in general contracting reference materials
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