A residential contractor in Alabama is building a single-family home. The basement foundation wall is 8 feet high with 4 feet below grade. What is the minimum required wall thickness for poured concrete?
Correct Answer
C) 6 inches
Alabama building code requires minimum 6-inch thickness for poured concrete foundation walls in this configuration.
Why This Is the Correct Answer
Alabama's building code (based on the International Residential Code) requires a minimum of 6-inch thickness for poured concrete foundation walls in standard residential configurations — including an 8-foot wall with 4 feet of below-grade depth. Poured concrete achieves sufficient structural integrity at 6 inches for typical soil and load conditions in this configuration.
Why the Other Options Are Wrong
Option A: 12 inches
12 inches is excessive for this residential application and exceeds the minimum code requirement. Walls this thick may be used in high-load commercial applications but are not the minimum for the described residential scenario.
Option B: 10 inches
10 inches exceeds the minimum code requirement for the described configuration. This thickness might be appropriate for walls with greater below-grade depth or unusual soil pressure conditions.
Option D: 8 inches
8 inches is also above the minimum required for this configuration. While an 8-inch wall would be structurally adequate, Alabama code allows poured concrete at 6 inches for standard residential basement walls with 4 feet below grade.
Memory Technique
Think '6 for poured.' Poured concrete is denser and stronger than block, so it achieves code compliance at a thinner 6-inch minimum. Block walls typically require 8 inches — the difference is the material.
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