California Residential Inspector Practice Exam

What is the assumed presumptive load-bearing value for sand, silty sand, clayey sand, silty gravel, or clayey gravel?

1. 1,000 psf

2. 1,500 psf

3. 2,000 psf

4. 2,500 psf

The correct answer is: 2,000 psf

The assumed presumptive load-bearing value for soils like sand, silty sand, clayey sand, silty gravel, or clayey gravel is established in foundational engineering and soil mechanics. A value of 2,000 pounds per square foot (psf) is a commonly accepted baseline for these types of granular soils in California. This value is derived from empirical data and typical behavior of these soil types under load. Soils classified within these categories can generally support a significant load due to their granular nature, which allows for good drainage and stability when compacted. The 2,000 psf value serves as a foundational guideline for engineers and inspectors to determine the suitability of a site for residential construction, helping to ensure safety and structural integrity. Understanding this presumptive load-bearing value is crucial for making decisions about foundation design and site preparation, particularly in regions like California where soil types vary significantly and can influence construction practices. The guidelines take into account not only the physical properties of the materials but also the local building codes and safety standards that govern residential construction.