What is the minimum concrete cover required for #6 rebar in a concrete footing exposed to earth in Florida?
Correct Answer
D) 3 inches
According to ACI 318, the minimum concrete cover for reinforcing steel in footings and other structural members cast against and permanently exposed to earth is 3 inches. This protects the rebar from corrosion.
Why This Is the Correct Answer
According to ACI 318 Building Code Requirements for Structural Concrete, the minimum concrete cover for reinforcing steel in footings and other structural members that are cast against and permanently exposed to earth is 3 inches. This requirement applies regardless of the rebar size, including #6 rebar. The 3-inch cover provides adequate protection against corrosion from moisture and chemicals in the soil. This standard is adopted by the Florida Building Code and is critical for ensuring the longevity and structural integrity of concrete foundations in Florida's humid climate.
Why the Other Options Are Wrong
Option A: 2 inches
2 inches is insufficient cover for rebar exposed to earth conditions. This amount of cover is typically used for interior concrete members not exposed to weather or earth contact, where corrosion risk is minimal.
Option B: 4 inches
6 inches is excessive for standard footing applications and represents cover requirements for more severe exposure conditions or special circumstances not typical for standard residential footings.
Memory Technique
Think 'Earth = 3' - whenever concrete touches earth (footings, slabs-on-grade), the minimum cover is always 3 inches for rebar protection.
Reference Hint
ACI 318 Building Code Requirements for Structural Concrete, Table 20.5.1.3.1 (Minimum concrete cover) or Florida Building Code Chapter 19 (Concrete)
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