Roof Deck & Composite Floor Deck

For: Industrial, Commercial, Institutional & Residential

Introduction

Roof Deck

Steel deck is 38 mm or 76 mm deep, 750 to 900 mm wide, fluted steel sheets usedin the construction of a roof as the supporting structural member on which thebuilt-up roofing system is placed. Roof deck is most commonly used in a flat(horizontal) roofing configuration, but can also be used for sloping roofs.

Composite Deck

Composite deck is a similar product to roof deck and is a fluted steel sheet,38 mm or 76 mm deep. What distinguishes composite deck from plain deck (flooror roof) is the composite structural action developed between the steel deckand a concrete slab. The composite deck initially acts as a stay-in-place formfor the concrete floor slab. After the concrete cures the composite steel deckand the concrete interlock creating a composite slab.

Deep Composite Deck

A deep composite deck is a similar product to the regular composite deck but isup to 203 mm deep. This deeper section, combined with additional reinforcingsteel and concrete, creates a floor system that can achieve spans over 9 m. Thelong spans provide additional flexibility and efficiencies in the structuralframing system.

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Design and Product Specification

Testing and Design of Composite Slabs

Composite slabs are a very practical and economical means of creating a floorsystem and works particularly well in conjunction with composite beamconstruction. The structural capacity of the slabs must be determined by testand each manufacturer publishes load tables for their individual profiles.CSSBI bulletins S2 Criteria for the Testing of Composite Slabs and S3 Criteria for the Design of Composite Slabs provide design and testing criteria forcomposite slabs.

Design of Steel Deck Diaphragms

Using a steel deck diaphragm can often obviate the need for separate bracing.The CSSBI B13 Design of Steel Deck Diaphragms shows how to use the inherentin-plane stiffness of steel deck to transfer lateral loads within a structuralsystem. This 3rd edition of the manual now gives design tables based on boththe Tri-Services Method and the SDI Method. Frame connection types includearc-spot welds, screws and Hilti pins. This 3rd edition has been updated tomeet the requirements of the 2005 National Building Code of Canada andCSA-S136-01 (with 2004 supplement) Specificationfor the Design of Cold-Formed Steel Structural Members.

Acoustic Deck

Using a steel deck is generally a structural product designed to resist gravityloads. However, from the time it was first commercially introduced, there havebeen successful attempts to utilize deck to perform more than one function.Acoustic roof deck is one example of using the decking material to performmultiple functions with very little increased cost. The acoustic deck providesa finished ceiling with noise reduction capabilities while still providing therequired vertical and horizontal load resistance. The noise reduction isachieved by the perforations and the acoustical insulation or material. Thesound penetrates the deck through the perforations and is absorbed by theinsulation.

The CSSBI 10M Standard for Steel Roof Deck andthe CSSBI 12M Standard for Composite Deck are intended to assist specifiers,designers, buyers, manufacturers and erectors of steel roof and composite deckby providing information which can be adopted by reference where desired. Thesestandards include recommended minimum requirements for grade of steel, basesteel design thickness, metallic coating designation, loads, resistances anddeflections, as well as design, fabrication and erection in general. Currentlythe CSSBI does not have a standard for the deep composite deck products.