NM CID GB-2 Practice Questions - New Mexico CID GB-2 Residential Building Contractor Examination Exam

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On a GB-2 house in Santa Fe County, the local frost depth is published as 24 inches. Per IRC 2021 R403.1.4.1 and NMAC 14.7.3.12, what is the correct minimum depth to the bottom of an exterior spread footing that is not a frost-protected shallow foundation?

12 inches below grade, because that is the New Mexico statewide minimum 18 inches below grade, matching a common Sandoval County recommendation 24 inches below finished grade so the footing bottom is below the local frost line 36 inches below grade, the IRC default frost depth for all mountain jurisdictions

Correct Answer:

24 inches below finished grade so the footing bottom is below the local frost line

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