GENERAL INFORMATION

The Information contained in these specifications has been produced by consulting professional architects and engineers licensed in the U.S., other information in regards to use and practice has been obtained from consulting construction management personnel in this field. The architects and engineers have referenced current standard manuals on steel construction from AISC and AISI specifications pertaining to the design of cold-formed steel structural members.

These specifications are prepared as an aid to a professional architect or engineer to assist them in their structural design as well as help familiarize them with LRKD Industries' Galvanized Metal Deck. This information should not be relied on for any specific application without a careful review by the licensed professional architect, or engineer of record of the proposed application.

This information has been made available as a courtesy to any party on request, LRKD Industries does not charge a fee for this information and is not rendering a professional service. Any person or party who uses such information assumes all liability arising from such use.

COMPOSITE STEEL DECK & ROOF DECK
GAUGE 'G'	WIDTH	AVAILABLE	LENGTH
16 MSG	36"	12', 14', 16'	20
18 MSG
20 MSG
22 MSG

AVAILABLE PAINTED OR GALVANIZED

NOTE: Other lengths are available listing reflect typical lengths

TERMS AND DEFINITIONS:
A.C.I.	American Concrete Institute
A.S.T.M.	American Society for Testing and Materials
A.I.S.C.	American Institute Of Steel Construction
A.I.S.I.	American Iron and Steel Institute
CDA	Corporate Design Of America, P.C.
KSI	Kips Per Square Inch
O.C.	On Center/From Center To Center
SQ.FT.	Square Feet
U.L	Underwriters Laboratories, Inc.

METAL DECKING ILLUSTRATIONS

COMPOSITE STEEL DECK LOAD TABLE

STEEL FORM DECK AND ROOF DECK LOAD TABLE

SPECIFICATIONS

FOR COMPOSITE STEEL FLOOR DECK

LRKD Industries offers a steel deck solution that acts as both a permanent formwork and a structural reinforcement. Cold-rolled from ASTM-compliant galvanized steel, this deck integrates with concrete upon curing, forming a single, robust structural element for the slab.

ADVANTAGES

Composite steel decking functions as a permanent formwork, eliminating the need for traditional timber forms and often temporary shoring. The interlocking design of the steel deck and concrete slab creates a bond that provides the necessary steel reinforcement, reducing the need for rebars. Furthermore, LRKD Industries' steel deck serves as a working platform for construction personnel.

FIREPROOFING

Fireproofing must be applied according to Underwriters Laboratories, Inc. requirements or local code requirements, whichever is more stringent. Application shall follow the fireproofing manufacturer's specifications.

Steel decking requires preparation for coating as per coating manufacturer specifications. LRKD Industries is not responsible for soiled, dirty, or improperly prepared steel decks after delivery to the site. The contractor is responsible for maintaining the steel deck stored on site.

Structural Designer Note: Investigate local building and fire codes in the work's locality to ensure proper fireproofing.

FOR NON-COMPOSITE STEEL FORM DECK AND ROOF DECK

FOR FLOORS

LRKD Industries’ Steel Deck is produced through cold rolling and galvanization processes, utilizing ASTM-conforming steel material. This steel deck is intended solely for use as formwork or, in specific situations, as a temporary platform. It is important to note that the deck itself is not engineered to provide structural strength and therefore does not contribute to the structural integrity of any proposed application.

ADVANTAGES

Steel Deck serves as a permanent formwork, eliminating the need for traditional wood forms and often temporary shoring. It can remain in place for the structure's lifespan or be removed. Additionally, it functions as a convenient staging platform for workers during construction.

NON-COMPOSITE DECK DESIGN & MATERIALS

LRKD Industries' non-composite steel deck must meet ASTM A611 or A446 standards, with a minimum yield point of 33 ksi. It also adheres to the "American Iron & Steel Institute" specifications for cold-formed steel structural members.

The delivered thickness of the steel deck must be at least 95% of the design thickness; however, thickness at bends may vary due to cold-forming. Section properties, when the deck acts as a form in bending, are calculated according to the 1980 edition of the American Iron & Steel Institute specifications for cold-formed steel structural members.

Construction live loads are based on generally recognized engineering principles, allowing for a 150-pound concentrated load on a 1-foot section of deck or a 20 pounds/sq. ft. uniform load. Under the combined weight of wet fresh concrete, the deck, and construction live loads, the maximum stress in the deck should not exceed 0.6 times the yield strength of 36 ksi. Deflection of the steel, as a single form, is limited by the concrete weight of the uniformly loaded steel deck to L/180 or ¾ inch, whichever is less.

FINISH AND COATINGS

LRKD Industries offers steel deck options that meet rigorous standards. Our galvanized steel deck adheres to ASTM A525, with coating classes of G60, G90, or higher, ensuring superior galvanization.

For our painted steel deck, a primer coat is applied in the shop to a clean, dry, and exposed surface. To maximize adherence, sections of the steel deck that will be in contact with concrete or other masonry cement (excluding fireproofing) may remain uncoated.

CONCRETE

Concrete usage must comply with all relevant sections of the ACI Building Code for reinforced concrete. If buggies or other excessively heavy equipment exert point loads on small floor areas, the concrete must be planked.

Structural designer note: If heavy equipment is to be used, the structural designer for the specific proposed application must assess the need for additional temporary shoring. Plank protection helps reduce the likelihood of damage to the steel deck. Any steel deck damaged during construction must be replaced with new materials.

The recommended minimum compressive strength for concrete is 3000 psi, or as specified by the structural designer's plan for the proposed application.

Structural designer note: When using steel deck as a non-composite element, it does not exhibit negative or positive bending performance. Therefore, the structural designer is reminded to verify the slab design for adequate reinforcing. The deck should not be assumed to act compositely with the concrete.

CONCRETE REINFORCEMENT

The minimum concrete topping over the steel deck is 1¾ inches. If additional negative bending reinforcement is used over the steel deck, a minimum concrete topping of ¾ inches is required.

Concrete reinforcement should utilize steel rebars or welded wire mesh, as specified by the structural designer. LRKD Industries suggests a minimum size of 6x6/10x10 or equivalent welded wire fabric. Reinforcement bars should have a minimum area equal to 0.0075 times the area of the concrete above the deck.

Structural Designer Note: The sizing of rebar or welded wire fabric depends on its intended use. LRKD Industries' recommendations are the minimum for controlling cracking caused by temperature and shrinkage. Reinforcing methods, sizes, materials, and spacings must be calculated by the structural designer for specific applications, adhering to generally recognized engineering practices.

CONCRETE ADDITIVES

Do not use additives, especially those containing chloride salts.

Important Note for Structural Designers: The use of any chloride salt additives on LRKD Industries Steel Deck will cause unwanted chemical reactions, leading to corrosion.

Installer's Responsibility: Should any form of chloride salt be used, it will be at the installer's own risk. LRKD Industries will not provide any warranty or accept responsibility for products used in such cases.

INSTALLATION

LRKD Industries’ steel deck installation must adhere to structural designer drawings and generally recognized construction practices. The steel deck should be attached to thicker supporting steel members in a flat position, following AISI recommendations for welding cold-formed members.

Installers are required to be familiar with and comply with all applicable trade codes, including those from The American Institute of Steel Construction and American Concrete Institute, which pertain to the installation of steel deck, concrete slabs, and structural members.

All steel decking shall be installed with interlocked side laps. Unless otherwise specified by the structural designer, a minimum end bearing of 27 inches and a minimum side bearing of 1 inch are required. Wherever practical, the steel deck should span over three or more supports.

ATTACHMENT METHODS

Steel decks must be attached to thicker structural members at 12 O.C., or as specified by the structural designer for the specific application, and as detailed in this section.

WELDS

All welding operations must adhere to applicable code requirements. Welders are required to be properly certified and licensed for the specific type of work they are performing.

Specific Welding Requirements:

• ARC Spot Welds (Puddle Welds): Not permitted on steel sheets exceeding .15 inch in thickness.

• Weld Washers:

Mandatory when steel deck thickness is less than .028 inch.

Dimensions: .05 to .08 inch thick.

Pre-punched hole: Minimum ⅜” diameter.

• Minimum ARC Weld Size: ⅝”

OTHER ATTACHING METHODS

Steel decks can also be attached to structural members using alternative methods such as rivets, metal stitching, screws, or powder-actuated fasteners.

Structural designer note: To ensure applicability and adequate strength, information on the chosen connector's strength should be obtained from manufacturers or through user-conducted tests.

SHEAR STUDS

Shear studs should be installed according to the structural designer's specifications for each application. If shear studs are spaced 18 inches on center (O.C.) or less, no other attachment methods are permitted for that specific structural member. All shear studs must comply with AISC specifications.

LRKD Industries recommends a 12-inch O.C. spacing for shear studs.

Structural Design Note: When shear studs are used at the junction of two steel deck pieces, the decks must be butted together. For plain junctions, steel decks may be overlapped.

SHORING

The structural designer is responsible for determining the necessity of temporary shoring for a specific application. If deemed necessary, the shoring must remain in place until the slab is self-supporting or achieves its designed compressive strength, as specified by the structural designer.

FIREPROOFING

Fireproofing must adhere to the stricter of either Underwriters Laboratories, Inc. requirements or local code specifications. Application should follow the fireproofing manufacturer's instructions.

The steel deck must be prepared for coating according to the coating manufacturer's specifications. LRKD Industries is not responsible for soiled, dirty, or improperly prepared steel decks after delivery to the site. The contractor is responsible for maintaining the steel deck stored on site.

Structural Designer Note: Investigate local building and fire codes where the work is performed to ensure proper fireproofing protection.

FOR ROOFS

LRKD Industries offers a Steel Deck, cold-rolled from ASTM-compliant galvanized steel. This versatile product serves as formwork for concrete topping, a roofing material, or a support for roofing, depending on the structural designer's specifications for the intended application.

ADVANTAGES

Steel deck serves as a supportive base for roofing materials or concrete, depending on the roof's design. It can be utilized as a concrete-topped roof, solely as a roofing material, or as a base for other roofing materials.

Structural Designer Note: If the roof deck is intended as a concrete-topped roof, the structural designer should consult either the composite section or the form deck section of these specifications, depending on whether a composite deck or form deck design is chosen.

ROOFING

For roof designs that do not include concrete topping, consult the roofing materials manufacturer regarding the installation of roofing materials and their attachment to the steel deck.

Structural Designer Note: When steel deck serves as a structural platform or backing for roofing materials (excluding concrete material), LRKD Industries' specifications for composite steel floor deck will apply, unless otherwise stated in this section.

ROOFING

For roofing applications, LRKD Industries strongly advises opting for galvanized steel deck over plain deck. This provides enhanced protection against moisture exposure and the elements.

Galvanized Metal Decking Supply Solutions

Build with confidence and corrosion resistance. Our galvanized metal decking offers strength, durability, and long-lasting performance for a wide range of commercial and industrial construction projects. Whether you're working on roofing, flooring, or mezzanines, we provide high-quality decking products that meet your project specs and timelines.

Partner with LRKD Industries for dependable materials and expert support.

👉 Submit your plans today for a FREE consultation on galvanized decking requirements.
📍 Address: 98 N Industry CT, Deer Park, NY 11729, US
📞 Phone: +1 646-880-6778
📧 Email: info@lrkdindustries.com

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