Using the 3-4-5 Method of Building Layout

Why does the building layout follow the 3-4-5 Method?

Identify a Base Line:


1. Start by marking a baseline along one edge of the area where the right angle is needed. For example, this could be the edge of a foundation or a wall.

Measure Along the Base:


2. From one end of the baseline, measure 3 units along this line. Mark the end of this measurement as Point A.

Measure Perpendicular Line:


3. From the same starting point (Point O), measure 4 units at approximately a 90-degree angle to the base. You can use an adjustable square or approximate the angle by eye. Mark the end of this measurement as Point B.

Check the Hypotenuse:


4. Measure the distance between Point A (on the baseline) and Point B (on the perpendicular line). If the distance is exactly 5 units, then the angle between the two lines is a perfect 90-degree angle.


By following these steps, you can quickly and accurately establish a square layout for building foundations or other construction projects.




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