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2024 International Residential Code (IRC)
Chapter 4 Foundations

Quiz: 2024 International Residential Code (IRC) Chapter 4 Foundations

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1. Under what condition is the use of wood foundations in Seismic Design Category D0, D1, or D2 permitted according to Section R401.1?

Only for buildings with one floor and a roof.
Only where interior basement walls are constructed at intervals not exceeding 25 feet.
When designed in accordance with accepted engineering practice.
Never, as wood foundations are prohibited in these seismic categories.

2. What is the minimum grade fall required for surface drainage away from foundation walls within the first 10 feet?

4 inches
6 inches
8 inches
10 inches

3. For a building located in Seismic Design Category C, when soil testing is performed, what additional information must the geotechnical report include according to Section R401.4?

The soil's moisture content and density.
The site class and short-period spectral response acceleration (SDS).
A detailed analysis of the soil's expansive potential.
Recommendations for waterproofing and dampproofing.

4. According to Table R401.4.1(1), what is the presumptive load-bearing value for Silty sand, sand-silt mixtures (SM) material?

1,500 psf
2,000 psf
3,000 psf
4,000 psf

5. Which of the following soil groups, classified according to the Unified Soil Classification System, is described as having 'Poor' drainage characteristics and 'High' frost heave potential?

SW (Well-graded sands)
GM (Silty gravels)
ML (Inorganic silts)
MH (Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts)

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