Chapter 18A — SOILS AND FOUNDATIONS
Section 1806A — PRESUMPTIVE LOAD-BEARING VALUES OF SOILS
2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California
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1806 A .1 Load combinations. The presumptive load-bearing values provided in Table 1806 A .2 shall be used with the allowable stress design load combinations specified in ASCE 7, Section 2.4 or the alternative allowable stress design load combinations of Section 1605 A .2. The values of vertical foundation pressure and lateral bearing pressure given in Table 1806 A .2 shall be permitted to be increased by one-third where used with the alternative allowable stress design load combinations of Section 1605 A .2 that include wind or earthquake loads. 1806 A .2 Presumptive load-bearing values. The…