What is the minimum concrete compressive strength required by the Michigan Building Code for residential foundation walls?
Correct Answer
A) 2,500 psi
The Michigan Building Code requires a minimum compressive strength of 2,500 psi for concrete used in residential foundation walls.
Why This Is the Correct Answer
The Michigan Building Code requires a minimum concrete compressive strength of 2,500 psi (f'c = 2,500 psi) for residential foundation walls. This is the minimum strength at which concrete provides adequate structural performance for typical residential loads. Concrete is tested at 28 days for this rating, and the mix design must be specified to achieve this strength consistently.
Why the Other Options Are Wrong
Option B: 3,000 psi
3,000 psi is a common concrete mix strength used in commercial construction and some high-exposure residential applications (like garage slabs or flatwork subject to freeze-thaw cycles and deicers), but it exceeds the minimum required for residential foundation walls. Confusing the application type leads to selecting this higher value.
Option C: 3,500 psi
3,500 psi is even higher than required and is typically specified for structural concrete in commercial or industrial settings, or for residential elements exposed to severe weathering conditions. It is not the code minimum for standard residential foundation walls.
Option D: 2,000 psi
2,000 psi is below the minimum required and would produce concrete that is too weak for foundation wall applications. Concrete at this strength does not provide adequate resistance to soil pressure and structural loads in a residential foundation.
Memory Technique
Remember the phrase '2,500 is the floor' for residential foundation floors and walls. The minimum is 2,500 psi — anything less is below code. Think of it as the foundation of your knowledge: the base minimum is 2,500. Above-grade or exposure-rated work goes up from there.
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