Under the Oregon Structural Specialty Code, what is the minimum concrete strength requirement for residential foundation walls?
Correct Answer
C) 2,500 psi
The Oregon Structural Specialty Code requires a minimum concrete strength of 2,500 psi for residential foundation walls.
Why This Is the Correct Answer
Option C is correct. The Oregon Structural Specialty Code specifies a minimum compressive strength of 2,500 psi (pounds per square inch) for concrete used in residential foundation walls. This threshold ensures adequate structural performance under residential loading conditions.
Why the Other Options Are Wrong
Option A: 3,000 psi
3,000 psi exceeds the minimum required for residential foundation walls. While 3,000 psi concrete is commonly used in commercial and heavier applications, the code minimum for residential foundations is the lower threshold of 2,500 psi.
Option B: 2,000 psi
2,000 psi is below the code minimum and would not meet Oregon's structural requirements for foundation walls. Concrete of this strength is insufficient for structural foundation applications.
Option D: 3,500 psi
3,500 psi is a higher-strength mix often used in driveways, slabs subject to freeze-thaw cycles, or commercial footings. It exceeds the residential foundation wall minimum and is not the code-required threshold.
Memory Technique
Remember '2,500 psi for residential foundations' with: 'Two-and-a-half thousand keeps the house standing.' The 2,500 psi figure is the structural baseline—it's intentionally set lower than commercial standards to reflect residential load conditions.
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