// DEFINITION

# Subgrade

The soil prepared and compacted to support a structure.

### Related Code Sections

A403.4.1 Guidelines for the Seismic Retrofit of Existing Buildings, Pole Structures

whose required depth of embedment is determined by pole formulas. The coefficient of

*subgrade*reaction used in deflection calculations shall be based ...A403.4.1 : Guidelines for the Seismic Retrofit of Existing Buildings, Pole Structures

whose required depth of embedment is determined by pole formulas. The coefficient of

*subgrade*reaction used in deflection calculations shall be based ...A403.4.1 Earthquake Risk Reduction in Wood-Frame Residential Buildings With Soft, Weak or Open Front Walls, Pole Structures

whose required depth of embedment is determined by pole formulas. The coefficient of

*subgrade*reaction used in deflection calculations shall be based ...R506.2.2 Floors, Base

) sieve shall be placed on the prepared

*subgrade*when the slab is below grade. Exception: A base course is not required when the concrete slab ...R506.2.2 Floors, Base

a 2-inch (51 mm) sieve shall be placed on the prepared

*subgrade*where the slab is below grade. Exception: A base course is not required where ...