Coastal and Floodplain Construction Inspector's Practice Exam

What is the minimum specified compressive strength of concrete for basement walls exposed to weather in Michigan?

1. 2500 psi

2. 3000 psi

3. 3500 psi

4. 4000 psi

The correct answer is: 3000 psi

The minimum specified compressive strength of concrete for basement walls exposed to weather in Michigan is 3000 psi. This standard is established to ensure that the concrete can withstand the varying weather conditions that are common in the region, particularly the freeze-thaw cycles that can cause damage to lower-strength concrete. The 3000 psi strength provides a balance between durability and practicality for residential and commercial construction, ensuring sufficient resistance to moisture penetration and structural integrity over time. Higher strengths, such as 3500 psi or 4000 psi, can be beneficial in certain applications, but for general basement wall construction exposed to weather, the 3000 psi specification is adequate and commonly required by building codes. The choice of 2500 psi would generally be considered insufficient for these conditions, as it may not provide the necessary longevity or durability against Michigan's climate challenges.