Mid-Island Steel is able to supply metal decking for your structural steel project. We’ve served Long Island New York with structural steel fabrication and steel supply for over 30 years. Steel deck material is a corrugated form of thin sheet metal used for flooring or roofing in commercial structures such as multi-story buildings. There is a wide variety of metal decking which can accommodate any construction projects you may have.

If you’re looking for steel roof deck, floor decks or even shallow form decking, we can supply what you need. Steel roof deck comes in a wide variety. There are several profiles which are typical such as B-Deck and N-Deck. The variety of depths and heights is what makes the different profiles better options for different projects. Metal Roof Decking also comes in a variety of finishes. This includes primed, painted or you can purchase with a galvanized steel decking finish.

If you’re looking for steel floor deck, then you can contact us. We are able to provide B-Deck and also W3-Deck as floor decking options. If we don’t have on hand what you need, we can order standard floor deck profiles too.

If you’re on Long Island and need steel decking for your project, give Mid-Island Steel a call today. We’re always available to help discuss you steel fabrication needs.


STeel Decking

What is corrugated steel decking?

Corrugated steel decking is a form of steel sheeting that is commonly used in the construction industry as a structural component for floors, roofs, and walls. This type of decking consists of a series of parallel ridges and furrows, giving it a corrugated appearance. It is known for its durability, strength, and high load-bearing capacity, making it ideal for creating stable and secure structures. Corrugated steel decking is often used in commercial and industrial buildings, as well as in bridge and mezzanine construction. It is also a popular choice for creating elevated platforms and walkways. In addition to its structural integrity, corrugated steel decking is resistant to fire, corrosion, and pests, making it a versatile and reliable option for various construction projects.

Importance of corrugated steel decking in construction

Corrugated steel decking plays a crucial role in construction, especially in providing support for insulation and waterproof membranes for roofs. Its strong and durable nature makes it an ideal choice for creating a solid base for these essential roofing components. Additionally, corrugated steel decking is also widely used in flooring solutions, providing a sturdy and reliable base for various construction projects.

In addition to supporting roofs and floors, corrugated steel decking is also utilized in material handling solutions such as rack deck and mezzanine deck. It provides a stable and dynamic platform for storing and organizing materials in a construction setting.

Furthermore, corrugated metal decking offers a variety of solutions to meet construction needs, with different profiles and finish options available to suit specific project requirements. Whether it’s for roofs, floors, or material handling, corrugated steel decking provides a versatile and dependable solution for various construction applications. Its ability to support insulation, waterproof membranes, and provide a stable base demonstrates its importance in modern construction processes.

Benefits of Corrugated Steel Decking

Corrugated steel decking is a popular building material known for its durability, strength, and versatility. It is commonly used in construction projects to create sturdy and long-lasting floors, roofs, and mezzanines. There are several key benefits to using corrugated steel decking in construction, including its fire resistance, ease of installation, and sustainability.

Strength and durability

Selecting the right type of steel decking is crucial for ensuring the longevity of a project, including roof and floor decks. The durability of the finished structure relies heavily on the strength of the steel decking used.

Two common finish options for steel decking are prime painted and galvanized. Prime painted steel decking is coated with a layer of paint that provides protection from corrosion and rust, offering durability against the elements. On the other hand, galvanized steel decking is coated with a layer of zinc, which creates a protective barrier against rust and corrosion, increasing its longevity and durability.

Choosing the appropriate finish option is essential for ensuring the steel deck’s longevity and protecting it from potential damage. The right type of steel decking, whether prime painted or galvanized, will safeguard the structure against harsh environmental conditions, such as moisture, sunlight, and temperature fluctuations.

Selecting the right type of steel decking, whether it is prime painted or galvanized, is crucial for ensuring the durability and longevity of the finished project. The right choice will protect the steel deck from corrosion and rust, ultimately extending the life of the entire structure.

Fire resistance

Steel decking, when used in conjunction with fire-resistant materials such as coatings and insulation, can significantly increase the fire resistance of building construction. The use of steel decking provides structural strength and support, while the fire-resistant materials help to slow down the spread of fire and protect the integrity of the building. This combination creates a barrier that can prevent the rapid spread of fire, giving occupants more time to evacuate safely and reducing the potential for fire damage.

Meeting fire code regulations and standards is crucial to ensuring the safety of building occupants and mitigating the risk of fire damage. These regulations dictate the use of fire-resistant construction materials, proper installation of fire alarms and sprinkler systems, and adherence to evacuation plans. By following these regulations, building owners and occupants can have confidence in the safety of their environment in the event of a fire.

The use of steel decking in conjunction with fire-resistant materials and meeting fire code regulations are essential for ensuring the fire resistance of building construction. This helps to protect the safety of occupants and mitigate the potential for fire damage.


Steel decking offers unparalleled cost-effectiveness to construction projects. Any thorough cost-benefit analysis will reveal that using steel decking can result in substantial savings for the project. Although the initial investment may be higher than alternative materials, the return on investment is evident in reduced labor costs, elimination of formwork, and decreased construction time. The anticipated benefits of using cost-effective decking materials include minimized maintenance expenses, improved durability, and enhanced structural integrity. By utilizing steel decking, construction projects can expect to reduce projected expenses and increase overall profitability.

Furthermore, steel decking significantly reduces construction time, ultimately contributing to boosting job profitability. The efficient installation process of steel decking allows for quicker progress on the project, enabling contractors to take on more projects within a shorter timeframe. This decreases overhead costs and accelerates the project’s completion, resulting in increased profits for construction companies. Overall, the use of steel decking offers a cost-effective solution that not only benefits the construction project but also leads to higher job profitability.

Easy installation and maintenance

Installing steel decking is a straightforward process, but it requires careful attention to detail to ensure durability and longevity. Here are the steps for installation:

1. Start by clearing the area of any debris or obstacles.

2. Place the steel decking panels in the desired position, ensuring they fit snugly together.

3. Use a power screwdriver and self-tapping screws to secure the panels to the supporting structure.

4. Trim the edges of the decking to fit, if necessary, using a saw or cutting tool.

5. Finally, check for any loose or protruding screws and tighten or trim as needed.

For long-term care and durability, it’s important to regularly inspect the decking for signs of wear, such as rust or corrosion, and address any issues promptly. To prevent these issues, consider applying a sealant or protective coating to the steel decking every few years. Additionally, avoid placing heavy or sharp objects directly on the decking to prevent damage.

Proper usage of the steel decking will prolong its lifespan. Avoid overloading the decking and always use caution when handling heavy objects to prevent denting or warping. Regular cleaning with a mild detergent and water can also help maintain the decking’s appearance and prevent corrosion. Following these guidelines will ensure the steel decking remains in top condition for years to come.

Roof Deck

Steel roof deck, also known as corrugated steel decking or simply roof decking, is a structural component used in the construction of roofs. It is typically made from galvanized steel sheets that are formed into a series of parallel ridges and valleys, creating a corrugated pattern. The primary purpose of steel roof decking is to provide support and stability to the roof system. Following are typical types of roof deck.

Type B Deck

Type B steel deck is commonly used in construction for flooring and roofing applications. With a height of 1.5 inches, this type of deck is suitable for various light and heavy-duty projects. It is available in different gauges and finishes, including prime painted and galvanized, offering flexibility and durability in different environments. The prime painted finish provides a clean and smooth appearance, while the galvanized finish offers added protection against rust and corrosion. Type B steel deck is also available with nested side-laps, which allows for easy and efficient installation, resulting in a seamless and secure fit. Overall, Type B deck is a versatile and reliable option for a wide range of construction projects, offering strength, durability, and various finish options to meet specific project requirements.

Type A Deck

Type A steel deck is commonly used in construction for its versatility and strength. With a height of 1.5″, it is available in various gauges to suit different load requirements. The deck comes in different finishes including prime painted and galvanized, providing options for both indoor and outdoor applications. The prime painted finish offers a clean and sleek look, while the galvanized finish provides added protection against corrosion.

Type A steel deck is commonly used in more economical situations due to its cost-effectiveness and durability. It is often used in roofing and flooring systems, providing support and stability while also serving as a platform for the installation of insulation and roofing materials. Additionally, its versatility extends to use as a form for concrete slabs, providing a stable and level surface during the pouring process.

Type A steel deck is a reliable and practical choice for various construction projects, offering strength and flexibility in a cost-effective package.

Type N Deck

Type N steel deck is a popular choice for construction projects due to its durability and versatility. With a 3” height, it is commonly used when supporting members need to be spaced farther apart, making it ideal for larger and more open spaces. The Type N Deck comes in different gauge options to accommodate varying load requirements.

One of the key features of Type N Deck is the various finish options available, including prime painted and galvanized. The prime painted finish provides a protective layer against corrosion and adds a clean, professional look to the deck. On the other hand, the galvanized finish offers superior protection against rust and corrosion, making it suitable for outdoor applications.

Overall, Type N steel deck is a reliable choice for a wide range of construction projects, and its versatility makes it suitable for various structural applications. It provides a strong and stable base for concrete forms, steel roof decking, and mezzanine floors. Its strength and durability make it a solid option for heavy-duty construction projects where supporting members need to be spaced farther apart.

Form Deck

Form decks are typically available in various types and sizes, including 9/16″ form decks. These decks are commonly used as forms for both roof and floor slabs in construction projects. The different types of form decks include steel form decks and metal decking panels.

Form decks are available in a variety of sizes and gauge options, with standard gauge options ranging from 22 to 28 gauge. The sheet lengths for form decks also vary, with standard lengths typically being between 6 to 36 feet, although longer lengths may also be available upon request.

The 9/16″ form decks, in particular, offer a sturdy and durable option for construction projects. These form decks come in various sizes and can be customized to meet specific project requirements. They provide excellent support and formwork for concrete slabs, making them a popular choice for both roof and floor applications.

Form decks are versatile and essential components of construction projects, offering a range of sizes and gauge options to meet the specific needs of various applications.

Composite Deck

Composite floor deck is available in sizes ranging from 1.5″ to 3″ deep, providing versatility for various construction needs. The galvanized steel construction ensures durability and strength, making it suitable for heavy duty flooring systems. Composite deck is commonly used in commercial and industrial buildings where high load capacities are required.

Steel composite deck is typically used in heavy duty flooring systems due to its ability to support heavy loads and provide long-lasting structural integrity. It is often utilized in conjunction with concrete to create a composite floor system that offers superior strength and durability. The galvanized finish provides corrosion resistance, making it suitable for outdoor applications as well.

Load tables for steel composite deck are available to help determine the appropriate size and spacing for different load requirements. Additionally, the diaphragm shear capacity of composite decking is an important consideration for engineers and designers when evaluating its performance in floor systems.

Overall, steel composite deck is a reliable and versatile choice for heavy duty flooring systems, offering strength, durability, and corrosion resistance for a wide range of construction applications.

Floor Deck

Floor deck refers to a type of construction material used to create a supportive surface for a building’s floors. It provides a sturdy foundation for concrete slab reinforcement and supports the weight of the flooring materials and occupants. Below are the  different types of floor decks, their advantages and disadvantages, and the considerations to keep in mind when selecting the right floor deck for a building project. It is important to consider load tables when designing floor deck systems as well.

Load tables are tables that provide information on the load-carrying capacities of various steel decking profiles. They list the allowable uniform loads, concentrated loads, and deflection limits for different spans and conditions. This information helps engineers and builders determine the appropriate steel decking to use for their specific project requirements.

1.5″ Floor Deck

Steel decking with depths ranging from 1.5″ to 3″ has diverse uses in construction. It is commonly used for floor systems in buildings, as well as for roof and form decking. The 1.5″ depth, in particular, is often used in applications where space is limited or where a shallow profile is desired. It provides a sturdy and reliable platform for concrete floors, maximizing structural strength and efficiency.

When it comes to heavy-duty applications, steel decking provides good diaphragm shear capacity. This makes it suitable for use in projects where high loading and strong lateral resistance are required, such as industrial facilities and warehouses.

In summary, load tables provide important load-carrying capacity information for steel decking, and the 1.5″ steel decking is versatile and well-suited for various construction applications, offering good diaphragm shear for heavy-duty use.

2″ Floor Deck

The 2″ Floor Deck is a versatile and durable flooring solution that is available in various gauges, including 20, 18 and 16. It comes in standard dimensions of 2″ depth and 24″ or 36″width, with custom dimensions also available upon request. The 2″ Floor Deck is commonly made from galvanized steel, which provides exceptional strength and corrosion resistance, making it suitable for a wide range of applications. 2″ floor deck only comes with interlocking side laps.

Galvanized steel offers several benefits, including increased durability, lower maintenance costs, and extended product life. The galvanization process involves coating the steel with a protective layer of zinc, which helps to prevent rust and corrosion. This makes the 2″ Floor Deck ideal for use in outdoor or high-moisture environments where traditional steel may be prone to deterioration.

Load tables for the 2″ Floor Deck are available for various gauges and types of steel. These load tables provide valuable information on the safe load capacity of the floor deck under different conditions, allowing for precise and reliable planning and design.

2″ Floor Deck is a durable and reliable flooring solution made from galvanized steel, offering exceptional strength and corrosion resistance. Its availability in different gauges, dimensions, and types of steel, along with load tables for reference, makes it a highly versatile option for construction projects.

3″ Floor Deck

The 3″ Floor Deck is a heavy-duty steel decking option designed for use in heavy duty roof decks. It is available in both galvanized and prime painted steel options, providing customers with a choice that best suits their specific needs. The load tables for the 3″ Floor Deck are available, ensuring that users can easily determine the appropriate thickness and span for their particular project. 3″ floor deck only comes with interlocking side laps.

The galvanized steel option offers significant benefits, including increased strength and superior corrosion resistance. This makes it an ideal choice for outdoor applications and environments with high levels of moisture or humidity. The galvanized coating provides a protective barrier that helps to prevent rust and corrosion, extending the lifespan of the steel decking and reducing the need for maintenance over time.

Whether you choose the galvanized or prime painted steel option, the 3″ Floor Deck is a reliable and versatile choice for heavy duty roof decks. With its load tables and choice of steel coatings, it provides the strength and durability needed to support demanding projects while resisting the damaging effects of corrosion.

Steel Deck Supply Long Island

If you’re looking for high-quality steel deck supplies on Long Island, look no further. At Mid-Island Steel in Long Island New York, we pride ourselves on providing top-notch products and exceptional customer service. Whether you’re a contractor, builder, or homeowner, we have everything you need to complete your steel decking project with ease. Our extensive inventory, knowledgeable staff, and convenient location make us the go-to supplier for all your steel decking needs.

Contact Mid-Island Steel For Steel Floor Deck

If you are in the market for metal deck roof material or floor decking metal, look no further than Mid-Island Steel. With a variety of metal deck products in stock and the ability to order any size for pickup or delivery, Mid-Island Steel is your go-to source for metal decking. Whether you are in need of metal roof deck material for a residential, commercial, or industrial project, Mid-Island Steel has you covered.

You can contact metal roof deck supplier Mid-Island Steel for floor deck by calling our main office at (631) 696-0066. Our knowledgeable and friendly staff will be happy to assist you with any questions you may have and help you find the perfect decking solution for your needs.