Direct Answer
A steel platform or mezzanine is a raised work surface supported by structural steel beams and columns, with decking (bar grating, checker plate, or concrete-filled steel deck) and handrail around the perimeter and at all open sides. Design is governed by AISC, IBC Chapter 5 (mezzanine), and OSHA 1910.23 (stair and fixed ladder requirements). Loading is typically 75–125 psf for maintenance platforms, 125–200 psf for industrial platforms.
Full Explanation
Platform components: (1) Support columns — HSS or W-shape depending on load and height. (2) Main beams (framing beams) — W-shapes or HSS carrying the deck loads. (3) Deck framing — closely spaced beams supporting the deck surface. (4) Deck surface — typically 1" × 3/16" bar grating (I-19-4 or similar), diamond plate, or formed steel deck with concrete fill. (5) Handrail — 42" height, 2" diameter top rail, midrail at 21", toeboard at floor level per OSHA. (6) Access stairs or ladder — per OSHA 1910.24 (fixed stairs). All must be designed by a structural engineer and have stamped drawings.
What This Means for Your Shop
Platforms are almost entirely miscellaneous steel — high labor content per ton, non-repetitive, and requiring coordination with process equipment, MEP, and architectural finishes. Price platform work at a higher $/ton rate than structural steel.
Common Mistakes
Fabricating a platform without stamped engineering drawings. OSHA compliance requires engineered drawings for all elevated work surfaces. A platform built from sketches or verbal direction is a liability exposure.
Recommended Process
For any platform scope, obtain stamped engineering drawings before fabrication. Include all required handrail, stairs, and access elements in the scope. Verify the decking type and finish requirement (galvanized, painted, or bare grating) before ordering.