Structural Deck Supplier: Load-Bearing Composite & Roof Deck Built to Spec

When your project calls for steel deck that actually carries load, you need a structural deck supplier that understands the difference between a panel that holds concrete in place and a panel that becomes part of the building’s structure. At Keystar Industries, that distinction drives everything we stock, cut, and ship. We supply composite floor deck and structural roof deck engineered to perform, backed by the gauge, finish, and SDI data your specifier needs to sign off with confidence.

We’re a locally owned and operated structural steel decking supplier based at 1920 Shawnee Road in Eagan, MN. We sell USA-made deck, cut every order to length, and get product on a truck the same day or next day in most cases. If you’re sourcing structural steel deck for a floor or roof system, this page walks through exactly what “structural” means, how to spec it, and why builders across the region keep calling us at (651) 256-0008.

What Makes a Deck “Structural”?

Not all steel deck does structural work. The term structural metal deck refers to panels that contribute to the load-carrying capacity of the building. They either become part of a composite slab or act as a diaphragm and span between supports under real roof loads.

There are two products that earn the “structural” label:

Composite floor deck bonds with poured concrete through embossments rolled into the steel. Once the slab cures, the deck and concrete act as one. The steel serves as positive reinforcement at the bottom of the slab, which means you often need less rebar and a thinner pour. This is true load bearing deck in every sense.
Structural roof deck spans between joists or beams, supports dead and live roof loads, and ties the structure together through diaphragm action. It resists lateral forces like wind and seismic and distributes them to the building’s frame.

By contrast, form deck is non-structural. It serves as a permanent form that holds wet concrete until it cures, then the concrete carries the load on its own. Form deck still has a job, and we stock plenty of it, but it doesn’t reinforce the slab the way composite deck does.

Structural vs. Non-Structural Deck at a Glance

Deck Type	Structural Role	How It Works	Typical Use
Composite floor deck	Structural (load bearing)	Embossments bond steel to concrete; deck acts as positive reinforcement	Multi-story floors, mezzanines
Structural roof deck	Structural (load bearing + diaphragm)	Spans supports, carries roof loads, resists lateral forces	Commercial and industrial roofs
Form deck	Non-structural	Permanent form only; cured concrete carries load	Slabs where deck isn’t counted on for strength

If you’re choosing between these systems, our composite deck options and roof deck pages break down profiles and depths in more detail. For form applications, see our form deck lineup.

How Structural Deck Performance Gets Engineered

Here’s where a real structural deck supplier earns its keep. The strength of any structural steel deck panel comes down to a handful of variables, and getting them right is the difference between a deck that performs and one that fails inspection.

Profile and depth. The shape of the rib and the overall depth of the panel control how far it can span and how much load it carries. Deeper profiles span farther. Our composite deck comes in 1.5″, 2.0″, and 3.0″ depths, and our roof deck spans the standard A, B, C, F, and N profiles.

Gauge. This is the thickness of the base steel, and it’s the lever you pull when loads go up. Common structural gauges run 22, 20, 18, and 16. The lower the number, the heavier and stronger the steel. A 16-gauge composite deck carries far more than a 22-gauge panel of the same profile.

Finish. Most structural deck ships galvanized for corrosion resistance, typically G60 or G90 per ASTM A653. The G90 coating carries more zinc and holds up better in humid or corrosive environments. We help you match the finish to the building’s service conditions.

Every one of these choices ties back to published engineering data. Composite and roof deck are designed using SDI load and diaphragm tables from the Steel Deck Institute, and the base steel meets ASTM International and American Iron and Steel Institute standards. When your engineer specifies a deck, those tables are how they prove it carries the load. We supply product that matches the spec and the data to back it up.

Why Specifiers and Builders Choose Keystar as Their Structural Deck Supplier

We’ve been supplying structural deck long enough to know that the spec sheet is only half the battle. The other half is getting the right product to the jobsite when you need it, cut to the length you need it. That’s the part too many suppliers get wrong.

Here’s what you get when you source structural deck from us:

The correct structural spec, every time. We don’t guess. Tell us the load, span, and conditions, and we match you to the right profile, gauge, and finish.
Real inventory. We stock composite deck, roof deck, and form deck so your project isn’t waiting on a mill run.
Same-day and next-day shipping or pickup. Most orders leave our Eagan yard fast. Schedules slip when material is late, so we don’t let material be the reason.
Cut-to-order panels. We cut deck to your lengths before it ships, which cuts field labor and waste on site.
USA-made steel. Every panel we sell is made in America to ASTM/AISI standards.
Accurate, fast quotes. You get pricing and lead times you can plan around, not vague estimates.
Knowledgeable support. Talk to people who know SDI tables, gauges, and diaphragm values, not a call center.

Built for Specifiers Who Need the Data

If you’re an engineer or architect, you already know that a missing diaphragm value or the wrong gauge can stall a submittal. We support specifiers with the SDI load and diaphragm data tied to the products we sell, so you can confirm the deck does what your design assumes. When you need a substitution or a value-engineering option, we’ll walk through the structural trade-offs with you instead of just quoting the cheapest panel.

Our Structural Deck Product Line

As a full-line steel deck supplier, we carry everything a structural floor or roof system needs:

Roof Decking — profiles A, B, C, F, and N for spanning roof loads and diaphragm performance. See the roof deck
Composite Decking — 1.5″, 2.0″, and 3.0″ depths for structural roof deck alternatives and, more often, composite floor slabs. Explore composite deck options.
Form Decking — non-structural permanent forms when the concrete carries the load. See form deck.
Accessories — closures, pour stops, fasteners, and everything else the system needs. Browse our accessories.
Rentals — equipment to keep your install moving.

Want the full catalog in one place? Visit our products page, or just call us and we’ll point you to the right panel.

How to Order Structural Deck From Us

Ordering is straightforward. Send us the project details, get a quote, and get product moving.

Share the spec. Profile, depth, gauge, finish, and lengths if you have them. If you only have loads and spans, that’s fine too. We’ll spec it.
Get a quote. We turn around accurate pricing and lead times quickly. Start with our request a quote
We cut to order. Your panels get cut to length before they leave the yard.
Ship or pick up. Same-day or next-day in most cases, delivered or ready at our Eagan location.

We’ve built this process around the reality that structural metal deck orders are usually time-sensitive. When the frame is up and the crew is ready, you can’t afford to wait two weeks for deck. That’s the whole point of keeping inventory and cutting in-house.

Frequently Asked Questions

What is the difference between structural deck and form deck?

Structural deck carries load as part of the building. Composite floor deck bonds with concrete and reinforces the slab, and structural roof deck spans supports while resisting lateral forces through diaphragm action. Form deck is non-structural. It only holds wet concrete in place until it cures, and then the concrete carries the load on its own.

Is composite floor deck considered structural?

Yes. Composite floor deck is load bearing deck. The embossments rolled into the steel bond it to the cured concrete so the two act as one structural slab, with the steel serving as positive reinforcement. It’s one of the two main types of structural steel deck we supply.

What gauge of structural deck do I need?

It depends on your load and span. Heavier loads and longer spans call for thicker, lower-gauge steel. Common structural gauges are 22, 20, 18, and 16, where 16 is the heaviest. Your engineer specifies the gauge using SDI load tables. Send us the requirements and we’ll match the right gauge.

Do you provide SDI load and diaphragm data?

Yes. We support specifiers with the SDI load and diaphragm data tied to the products we stock, so engineers and architects can confirm the deck performs as their design requires. The Steel Deck Institute publishes the tables that govern structural deck design.

How fast can you ship structural deck?

Most orders ship the same day or next day from our yard in Eagan, MN, and pickup is available too. We keep composite, roof, and form deck in stock and cut to order, which is how we keep lead times short on time-sensitive projects.

Is your steel deck made in the USA?

Yes. Every panel we sell is USA-made and produced to ASTM and AISI standards. American-made steel deck is one of the reasons our customers trust the spec and the quality.

Get a Quote on Structural Deck Today

When you need a structural deck supplier who knows the difference between a form and a load-bearing slab, stocks the right gauge and finish, and ships fast, we’re ready to help. We’ll match your spec, cut to order, and get USA-made composite or roof deck on the way.

Call us at (651) 256-0008 or request a quote now. You can also contact us with questions or learn more about Keystar. We’re at 1920 Shawnee Road, Eagan, MN 55122, ready to supply your next structural floor or roof system.