Structural Steel and Roof Framing for Texas Data Centers

Hail of 1.75 to 3 inches in diameter fell for about 90 minutes over San Angelo on May 21, 2020, according to the National Weather Service summary, and the damage ran across vehicles and roofs from one side of the city to the other. A data center roof lives with that threat for its entire service life, while also carrying chillers, dry coolers, pipe racks and sometimes generator exhaust. Structural steel and roof framing for a data center is therefore not a generic steel package; it is the structure that has to stay tight and level under equipment while the weather works on it.

Steel gives a data hall long clear spans, which means fewer columns on the floor and more flexibility in where racks and aisles go. It also gives the roof a way to carry mechanical loads that a lightweight roof cannot. The cost is a more complex coordination job: the steel has to be detailed around ducts, pipes, cable trays and equipment supports that are being designed at the same time.

We deliver structural steel and roof framing for data center shells and for the support buildings around them, and we treat the roof as a mechanical platform as well as a cover. Carrier and network owners who run switching and cable landing space, described under telecom and network carriers, ask the same of their steel: dry, level and quiet.

The package starts with the primary frame: columns, beams and bracing sized for the hall's spans and the loads above. Roof joists and metal deck follow, along with the supports for roof equipment, pipe racks and screen walls. Where the design includes a mezzanine or an electrical gallery, the steel carries that as well. Connections are detailed for the loads, and the shop drawings are checked against the architectural and mechanical sets.

Many data halls are enclosed by tilt-wall or precast panels with a steel roof, and some owners prefer an all-steel frame with insulated metal panels. Either way the roof framing needs to be coordinated with modular and prefabricated units that may be set on or beside the building, because their weight and anchorage change the framing.

Steel work succeeds or fails in the shop drawings. We review the detailer's drawings against the structural design and against the mechanical and electrical models before fabrication, asking where each pipe, duct and conduit crosses the steel. Penetrations are cut in the shop where possible, which is cleaner and cheaper than cutting in the field.

During erection we check plumb, level and alignment frame by frame, because errors that look small at the base grow at the roof. Bolted connections are inspected, welds are tested where required and the deck is fastened to the specification. Roof openings for equipment are framed before the deck goes down. Anything we cut in the field is documented and approved by the engineer.

Wind is a primary Texas design load. The National Weather Service rates the May 11, 1970 Lubbock tornado F5, with 26 deaths, more than 1,500 injuries along an 8.5 mile track and about $250 million in damage in 1970 dollars. We do not design a data center to resist an F5 tornado unless the owner chooses to, but that history, which owners in Lubbock know well, is why we ask owners what protection level they want and what the engineer recommends for the site.

Hail affects roof coverings and the equipment on them, and owners in San Angelo and across West Texas ask about it first. The Insurance Council of Texas reported 878 hail events in the state in 2024. Owners can respond with impact-resistant roof membranes, hail guards on condenser coils and sheltered equipment. Those choices change the framing: guards and screens add wind area and weight. We coordinate them with the structure before the steel is released, and we work with the chiller and cooling plant pads team so ground and roof equipment are designed together.

Fabrication and delivery times for structural steel vary with the market and the project, and a long lead can hold up the whole shell. We confirm detailing and mill orders early, and we sequence deliveries so the erector is not waiting for a piece and the yard is not crowded with steel that cannot yet be set. A laydown plan, a crane plan and a safe access route are part of the schedule.

The steel must be erected, decked and closed in before electrical gear arrives, and the roof must be waterproofed before sensitive equipment goes under it. In coordination with shell and core work, we set a date by which the building is dry and plan the steel schedule backward from it. Wind can stop a crane, so we build float into the erection plan.

Steel price follows tonnage, connection complexity, spans, finishes and the market. For a data center the tonnage depends on the loads: a roof that carries heavy equipment needs a larger frame than one that carries only the roof. Complex penetrations, special coatings for coastal or industrial sites and fireproofing add cost.

Owners can control cost by deciding early which equipment goes on the roof and which goes on the ground. Roof-mounted cooling saves yard space but costs steel, and ground-mounted cooling needs land but simplifies the roof. We present both options with the structural consequences and let the owner choose. For administration and security buildings on the same site, lighter framing often suffices. We also advise on the cost of coatings: a coastal or industrial atmosphere shortens the life of a plain finish, so the choice is made against the site and the owner's planned service life, not as a default.

Send the building size, the roof equipment list and the site address. We will return a framing concept, a coordination list for the mechanical and electrical trades and a schedule showing when the building must be dry.

Can the roof carry cooling equipment?

Often, yes, if the framing is designed for it. Roof-mounted chillers, dry coolers and pipe racks add weight, wind area and vibration, and the steel is sized and braced for them. We coordinate the equipment list with the structural engineer before the frame is released.

How do you protect a roof from hail?

With choices made in design: impact-resistant membranes, protective covers, hail guards on coils and sheltered equipment. We make sure the framing and the roof supports account for the added loads, and the owner's insurer may have its own requirements. We help the owner compare options on cost and protection.

What happens if steel is late?

The whole shell can wait. We confirm detailing and mill orders early, track fabrication progress and keep the foundations and slab ready ahead of delivery. If steel is late, we resequence the work that can proceed, such as underground utilities and equipment pads, so time is not lost everywhere.

Is steel or concrete better for the shell frame?

Each has strengths. Steel gives long spans and adaptable roof support; concrete panels give mass and a hardened wall. Many Texas data halls combine them, with concrete panels for walls and a steel roof. We recommend the combination based on spans, loads, schedule and owner priorities.