Structural Steel and Roof Framing for Data Centers

Steel gets ordered long before the first footing is poured. Mills, fabricators and detailers each take their own time, and a data center frame has more complications than most: heavy roof loads from mechanical equipment, large clear spans over the data hall, penetrations for ducts and pipes, and a roof that must stay dry over equipment that cannot tolerate leaks. If the frame is late, everything behind it is late.

We erect structural steel and roof framing for data center shells that use a steel frame, and for hybrid buildings where steel carries the roof over concrete walls. The work includes columns, beams, joists, bracing, metal deck, roof support for rooftop equipment, mezzanines for mechanical and electrical rooms, and the supports for cable tray and busway that hang from the structure.

The frame is also where owners decide how much future change they can afford. Extra capacity in the roof framing for added equipment, or a column grid that leaves room to re-lay the data hall, adds a small amount to the first building and saves a large amount later. We lay out these choices early so the owner is deciding with real numbers.

We start with the detailer and the fabricator, not with the crane. Shop drawings, connection design, mill orders and fabrication slots set the date steel arrives. We review the drawings with the structural engineer and the mechanical designer so penetrations, hangers and equipment supports are in the model before steel is cut.

Erection follows a sequence that suits the building. We start at a braced bay, build outward, and keep the frame stable at every stage. Crane placement, laydown areas and truck routing are drawn on the site plan in advance. The work ties directly into the data center shell and core package, since the frame and the envelope close together.

We manage the setting of steel, the bolted and welded connections, the joists and deck, and the roof edge and support framing. Having one team responsible from the first column to the last deck sheet reduces coordination gaps and shortens the time the frame stands open to weather.

Field welding and bolting are inspected by the special inspector, and we keep records of torque, weld procedures and welder qualifications. Corrections are done while the lift equipment is on site, not after it has been demobilized. Related finishes, including the insulated panel envelope, are described in tilt-wall and precast data center shells, a different structural option for the same building.

The roof of a data center is crowded. It may carry air handlers, dry coolers, exhaust fans, conduit and, on some designs, photovoltaic panels. Each of those adds a load that the frame has to carry, and each penetration is a potential leak. We coordinate roof curbs, supports and flashing details before the deck is placed, and we install waterproofing in a sequence that protects the interior.

Oklahoma weather is a design input. The National Weather Service Norman office records an average of 59.4 tornadoes a year in the state, with May the peak month. Wind uplift and lateral bracing are therefore not details to value-engineer away, and we do not remove bracing or temporary supports ahead of the engineer's sequence.

Steel can travel by truck or, for large orders, by rail, and some Oklahoma sites have that option. The City of Elk City says Big Elk Industrial Park is on rail, next to the Farmrail main line, which links to BNSF and Union Pacific. At the Ardmore airpark, a March 2026 report said a railroad expansion was under construction and that Grumman Road was being rebuilt to link the park with Highway 53.

Sites with rail and rebuilt roads make it easier to receive heavy shipments, and we ask about them during site selection. Even where they are available, we plan for trucking and for storage at the site, so a delayed railcar does not stall erection. Our long-lead equipment procurement page covers material tracking.

The steel frame connects to nearly everything else: slabs, utilities, cladding and the equipment above and below. Owners with campuses may pair this scope with hyperscale campus construction, in which many frames are erected in succession by a single team.

The steel scope also overlaps with the support buildings, such as the administration and security building, which often uses a lighter frame and conventional wall systems.

Steel price, fabrication complexity and erection time are the main drivers. A regular grid with repeated members is cheaper to fabricate and erect than a frame full of one-off connections. We help the design team simplify the frame without cutting capacity, and we provide pricing at the schematic stage so decisions about bay size and roof loading can be made with real figures. A colocation data center that expects to add halls usually pays for the extra structural margin, while owners such as hyperscale cloud providers tend to repeat a standard frame.

Price changes between order and delivery are a risk the owner should discuss with us. We recommend locking the quantity and price with the fabricator as soon as the design is stable, and we keep a list of items that could cause change orders later.

The engineer of record designs the frame, a steel detailer produces shop drawings, and the engineer reviews them. The city or county reviews the permit drawings under its adopted building code, which may be an earlier or a newer International Building Code depending on the jurisdiction and application date. We check with the building department which edition governs.

During erection, a special inspector checks bolts and welds. We schedule inspections ahead of the crane, because the connections need to be accepted before the next lift covers them. Documentation is delivered to the owner at closeout.

Send us your structural drawings or your schematic design. We will show a steel and roof sequence with the fabrication, erection and dry-in dates that fit your power date.

How far ahead of construction should steel be ordered?

As soon as the structural design is stable enough for the fabricator to proceed. The time from order to delivery varies with the market and the fabricator, so we ask for current lead times when we price. We schedule the foundations to be ready before the steel arrives.

Can steel framing be used with concrete walls?

Yes. Many data center shells use concrete panels for the walls and steel for the roof. The connection details between the two require coordination, and we handle them in the shop drawings and in the field with the engineer.

What roof loads should we plan for?

Plan for the equipment you expect today plus what you may add. Rooftop cooling equipment, exhaust fans and cable supports add weight. We recommend reserving structural capacity for future equipment and recording the limits on the drawings.

Who protects the building from rain during construction?

We do, through temporary roofing, early deck sealing and a plan for stormwater around the footprint. A wet building delays the interior trades and can damage equipment staged in it, so we aim to close in the roof as early as the schedule allows.