Geotechnical Engineer vs Structural Engineer

Quick Answer

Geotechnical engineers investigate subsurface conditions — soil types, bearing capacity, groundwater, and earth properties — and provide recommendations for foundation design. Structural engineers use those recommendations to design the actual foundation system. Both are professional engineers; their disciplines overlap at the foundation and work closely together on building projects.

What a Geotechnical Engineer Does

Investigates subsurface soil and rock conditions
Drills soil borings and collects soil samples
Performs laboratory testing on soil samples
Determines allowable soil bearing pressure for foundations
Recommends foundation types — spread footings, grade beams, piles
Evaluates expansive soils, groundwater, and settlement potential
Produces a geotechnical investigation report

What a Structural Engineer Does With the Geotech Report

Uses allowable bearing pressure to size footings and grade beams
Uses foundation type recommendation to select the structural system
Uses soil parameters for seismic site class determination
Uses expansive soil recommendations to design appropriate slabs and footings
Coordinates with geotechnical engineer on unusual conditions or questions
References geotechnical report in structural calculations

Typical Coordination Sequence

Geotechnical investigation begins early — it's often on the critical path
Structural engineer receives geotechnical report and begins foundation design
Questions on soil conditions are resolved between structural and geotechnical engineers
Both engineers' stamps typically appear in the permit package
Apex Grid provides both geotechnical and structural engineering under one contract

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