Steel & Metals

Steel is the workhorse of larger and commercial construction — very strong and able to span long distances.

Structural steel

• Beams and columns (wide-flange "I-beams") frame commercial buildings and long spans.
• Rebar reinforces concrete.

Light-gauge (cold-formed) steel

Thin steel studs and track used for commercial interior framing — straight, consistent, and non-combustible.

Other metals

Aluminum (windows, trim), copper (wiring, plumbing), and various metals for flashing and connectors.

Going Deeper (Intermediate)

Steel is strong in both tension and compression and is non-combustible. You'll meet it as structural shapes (beams, columns), rebar, light-gauge metal studs, connectors, and metal decking. Common shapes: W (wide-flange beam), C (channel), L (angle), HSS (tube), and plate.

Advanced / Pro-Level

The specifics that matter:

• Grades: A36 (general), A992 (wide-flange beams), A500 (HSS tube).
• Connections are bolted (high-strength A325 bolts) or welded (per AWS, with weld symbols on the drawings).
• Light-gauge steel framing (measured by gauge/mil) for non-combustible/commercial walls.
• Corrosion protection — galvanizing, primer, paint.
• Fireproofing — steel loses strength in fire, so it gets spray-applied or intumescent fire protection to meet assembly ratings. Rebar comes in Grade 40/60 for concrete reinforcement.

Practice Challenge

Steel is non-combustible, so why do high-rise steel beams still need spray-on fireproofing? (Answer: steel doesn't burn but loses strength rapidly when heated (it softens and can buckle in a fire) — fireproofing insulates it long enough to meet the assembly's fire-resistance rating and let people evacuate; non-combustible isn't the same as fire-resistant.)

In Practice

On a commercial interior you'll often frame walls with light-gauge steel studs instead of wood — they're straight, consistent, and non-combustible, which the fire code may require.

Common Mistakes to Avoid

• Confusing structural steel with light-gauge framing
• Using the wrong fasteners for metal
• Ignoring corrosion protection on exposed steel

Takeaway: Steel spans long distances and frames commercial buildings; light-gauge steel studs are common, non-combustible interior framing.

Educational overview — specific grades, sizing, and structural uses come from the building code and the project's engineer and specifications.