As we all know ,metal decking has become essential in modern construction, with composite floor decks and non-composite roof decks being the most common types. While both use corrugated steel sheets, their designs differ to handle structural loads versus weather protection. Understanding their distinct roles ensures optimal performance in steel-framed buildings.

What is metal floor deck?

Metal floor deck is composite metal floor deck, is a structural system consisting of profiled steel sheets (typically 0.8mm-1.5mm gauge galvanized steel) that serves as permanent formwork and tensile reinforcement for cast-in-place concrete slabs. The deck's trapezoidal ribs feature embossed patterns to create shear bond with concrete, enabling composite action that enhances load-bearing capacity (typically 3-7kPa for offices). This system provides fire resistance through concrete cover (60-120mm), eliminates traditional formwork, and allows faster construction (30-50% time savings versus conventional methods). Its lightweight nature (15-25kg/m²) reduces structural steel requirements while maintaining deflection control (L/180 to L/360 spans). Widely used in high-rise buildings, the system achieves vibration performance (4Hz+ natural frequency) and accommodates MEP integrations through pre-punched service holes.

What is metal roof deck?

Metal roof deck is non-composite metal roof deck, is a structural roofing component made from corrugated steel sheets (typically 22-20 gauge galvanized or painted steel) designed to provide diaphragm strength and support for roofing systems without bonding to concrete. Its deep rib profile (38mm-76mm) enhances load distribution for dead loads (insulation, HVAC) and live loads (snow, maintenance). The deck acts as permanent formwork for lightweight concrete or directly supports single-ply membranes, featuring anti-ponding slopes (1/4:12 minimum) for water drainage. Key performance includes high wind uplift resistance (tested to ANSI/FM 4471), corrosion protection through G90 galvanization, and fast installation with mechanical fasteners. Used in low-slope commercial roofs, it provides cost-effective spanning (1.8m-4.5m between supports) while meeting building code requirements for structural integrity and fire ratings when paired with spray-applied fireproofing.

What's the difference between them?

It is very important to understand the differences between metal floor decks and roof decks ensures you order the correct product for your construction needs. Floor decks provide composite strength for load-bearing floors, while roof decks offer weather-resistant protection. Always consider structural requirements, material specs, and performance needs before purchasing.

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