Per CBC Section 1907.4.1.1, what is the minimum concrete cover required for #6 rebar in a concrete column when the column is not exposed to weather or in contact with ground?
Correct Answer
A) 1.5 inches
CBC Section 1907.4.1.1 specifies minimum concrete cover of 1.5 inches for reinforcing bars in columns not exposed to weather or ground contact. This cover protects the steel reinforcement from corrosion and ensures proper fire resistance in California construction.
Why This Is the Correct Answer
CBC Section 1907.4.1.1 (corresponding to ACI 318) specifies 1.5 inches of clear cover for reinforcing bars in columns that are cast-in-place and not exposed to weather or ground. This cover provides adequate corrosion protection and fire resistance for interior structural members.
Why the Other Options Are Wrong
Option C: 2 inches
2 inches is the requirement for members cast against and exposed to weather (e.g., exterior walls). Applying this to an interior, sheltered column would be overly conservative and add unnecessary concrete volume.
Option D: 1 inch
1 inch is insufficient cover for a #6 bar in a column. Minimum cover must at least equal the bar diameter (0.75 in for #6), and code sets 1.5 in as the practical minimum for columns in protected environments.
Memory Technique
Remember '1.5 for inside columns' — the interior column is protected, so it only needs one-and-a-half inches. Think: 'inside, 1.5.' Whenever exposure increases, the cover goes up.
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