When establishing batter boards for a rectangular foundation, what is the primary method to ensure the corners are square?
Correct Answer
B) 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: Use a transit to measure angles
While a transit can measure angles, it's expensive equipment that's not always available on job sites, and the 3-4-5 method is more practical and commonly used for foundation layout
Option C: 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 magnetic compass for orientation
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
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
A detail drawing shows a scale of 3/4" = 1'-0". If a dimension measures 2.25 inches on the drawing, what is the actual dimension?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass