What Does a Structural Engineer Do? Gravity, Lateral, and the Load Path
A structural engineer designs the skeleton of a building — every element that carries load — and proves with calculations that the whole system stands up under gravity, wind, and earthquake. One idea runs through all of it: the load path, the continuous chain that carries every force from where it lands to the ground. Breaks in that chain are where buildings — and projects — fail.
Foundations — Where the Load Path Ends
The foundation transfers the building's loads into the soil: spread footings, grade beams, mats, or deep foundations (piers, piles) where the soil demands them. It is designed from the geotechnical report — the soils engineer's boring logs and bearing recommendations — which is why no honest structural quote exists before the geotech does. Foundation errors are the most expensive errors in construction, because everything built on top of them has to come off to fix them.
The Gravity System — Carrying the Building Down
Gravity design sizes the floors, roof, beams, columns, and walls that carry dead load (the building itself) and live load (people, furniture, snow, equipment) down to the foundation. The system follows the material: steel framing, cast-in-place or precast concrete, wood framing, masonry, or hybrids like wood over a concrete podium. Each has its own code, its own detailing, and its own failure modes — the design package states the system, the loads, and the member sizes a builder prices and builds from.
The Lateral System — Carrying the Building Sideways
Wind and earthquakes push sideways, and a separate system resists them: floor and roof diaphragms collect the lateral loads, chords and collectors deliver them to the vertical elements — shear walls, braced frames, or moment frames — and those carry the forces to the foundation. Lateral design follows ASCE 7 load provisions and the material standards (the SDPWS for wood, ACI 318 for concrete, AISC for steel). It is the part of structural design buyers see least and reviewers check hardest.
Delegated Design and Special Inspection
Parts of the structure are routinely designed by specialty engineers under the engineer of record's criteria: stairs, connections, precast elements, cold-formed steel, trusses, and tilt-up panel connections, among others. The EOR's drawings state what is delegated and to what criteria — a set that never says is a set that leaves the seams unowned. Many jurisdictions also require special inspection of structural work during construction; the structural package states those requirements so they are scheduled, not discovered.
Who Seals What
The structural set is sealed by an engineer licensed for structural work in the project's state — in several states, a structural (SE) credential beyond the base PE, or one required for defined building classes. Before you hire anyone, verify the license and the credential it actually carries. Then read the methodology and send a complete RFQ.
Who Publishes This Directory
Published by Apex Grid Engineering PLLC. The firms evaluated and listed on this site today are the publisher's own family of brands — this is an affiliated directory, not a neutral referee. The methodology below is the standard any engineering firm can be measured against, and it is the standard we hold our own firms to in public. Presentation order on this site is the publisher's choice and an experiment in what helps buyers decide — it is not an objective quality verdict, and no firm pays for placement. Coverage claims are limited to licensure the operator's bench actually holds, stated per state. No reviews, ratings, or project claims are published for any firm unless they can be documented — you will find none invented here.
Operated by Apex Grid Engineering PLLC. Founder & CEO: Jeremy “Chico” Mills — serial entrepreneur and USAF veteran. Jeremy is the founder and chief executive; he is not a licensed professional engineer, and no page on this site implies otherwise. The engineering behind the listed firms is performed and sealed by their licensed PE benches.