Protecting structural steel in a data center requires two separate but coordinated decisions: establish the fire-resistance rating required by the adopted building code and authority having jurisdiction (AHJ), then assess whether the steel’s actual environment requires corrosion protection. Select a tested or engineered fire-protection assembly for the specific members, substrate, thickness and exposure. Do not assume that every indoor steel frame needs primer, that a generic fireproofing claim establishes a rating, or that a corrosion coating can be placed beneath fireproofing without qualification.
Climate-controlled rooms may keep enclosed steel dry enough that routine painting is unnecessary. Humidity above 70 percent, condensation, leaks, chemical exposure, damaged finishes or aggressive local conditions can change that conclusion. The fireproofing supplier, coating manufacturer, structural and fire engineers, fabricator, applicator and AHJ must resolve compatibility and inspection responsibilities before work starts.
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Begin with the required fire-resistance rating
The project’s required rating comes from the jurisdiction’s adopted code, occupancy, construction classification, structural design and fire strategy. The AHJ determines whether the proposed method is acceptable. A product advertised as fire-resistant does not, by itself, prove that a particular column, beam, connection or frame meets the project requirement.
Document the design basis
- Identify the project location and adopted code edition.
- Confirm occupancy, construction type and the required structural fire-resistance period.
- List the members and connections requiring protection, including section sizes, shapes, restraint conditions and exposed surfaces.
- Define whether the steel is concealed, exposed for architectural reasons, located in a service room, or subject to impact and maintenance traffic.
- Record the AHJ submission, review and inspection requirements.
For a conventional prescriptive design, use a listed or otherwise accepted assembly whose tested thickness and application limits match the actual steel. For a performance-based design, qualified fire and structural engineers must define credible fire scenarios, performance objectives, thermal exposure, material behavior at elevated temperature and structural response. NIST Technical Note 1681 explains these concepts and analysis approaches; it is technical guidance, not a step-by-step project design.
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Prescriptive and performance-based routes
Prescriptive protection relies on standard fire tests and approved assemblies. It is usually the most direct route when member details and conditions fit an existing listing. Performance-based design uses fire scenarios and structural analysis to demonstrate that the frame maintains required stability and load-carrying performance. AISC identifies component qualification testing and structural analysis as recognized ways to demonstrate performance objectives under the applicable specification. Either route still requires AHJ acceptance and project-specific documentation.
Why heated steel needs protection
Steel loses strength and stiffness as its temperature rises. Passive fire-protection materials delay that temperature increase by insulating the steel or by swelling and forming an insulating char. The result depends on more than the product name. The qualified assembly, protection thickness, steel section factor, member geometry, substrate condition, exposure on each face, application quality and inspection records all matter.
Fire-resistance belongs to the tested or engineered system. A coating category such as spray-applied fire-resistive material, board enclosure or intumescent does not establish a four-hour, two-hour or one-hour rating without the supporting assembly evidence. Current manufacturer listings, engineering judgments and installation instructions must be checked for the exact product version and project conditions.
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| System | Where it is commonly used | Key compatibility questions | Advantages | Limitations and controls |
|---|---|---|---|---|
| Spray-applied fire-resistive material (SFRM) | Concealed beams, columns and floor framing where appearance is not a primary requirement | Is the steel bare, primed or galvanized? Is the primer approved for the specified material? Does the combination have the required bond qualification? | Commonly available for concealed framing and can cover complex shapes. | Requires controlled surface preparation, thickness verification, protection from damage and repair procedures. Finish and durability may be unsuitable for exposed areas. |
| Board or enclosure system | Exposed or accessible members where a robust, finished enclosure is preferred | Does the tested enclosure match the member size, joints, penetrations, fasteners and support details? | Provides a defined physical enclosure and can produce a clean appearance. | Joints, access openings, penetrations and later modifications must preserve the qualified assembly. Impact damage needs prompt repair. |
| Intumescent coating | Architecturally exposed steel where a thin, finished coating is desired | Is the primer, intermediate coat and topcoat combination listed? Does the thickness schedule match the steel section and fire rating? | Can preserve the appearance of exposed steel while providing passive protection. | Requires careful application and dry-film control. Appearance, durability, repairs and environmental limits must be specified. |
Compare candidate systems by rating evidence, permitted steel sections, bare or coated substrate, exposure and durability, appearance, access, inspection, repairability, installation sequence, lifecycle obligations and AHJ acceptance. Schedule and lifecycle cost are project-specific; no universal price or installation duration applies to every data center.
SFRM for concealed framing
SFRM is often selected where the steel will be hidden above ceilings, inside shafts or within other finished construction. The applicator must achieve the listed thickness and bond on the actual substrate. Dirt, oil, grease, loose scale and other contaminants can interfere with adhesion. The fireproofing manufacturer’s preparation instructions control, even where general industry guidance appears more permissive.
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Boards and enclosures
Board systems can be useful where the member remains visible or accessible. Their performance depends on the complete enclosure: board type, thickness, fasteners, joints, corners, penetrations and support framing. A field change that leaves a gap around a cable tray or access panel can invalidate the assumed assembly unless the design documents address it.
Intumescent coatings
Intumescent coatings react to heat and form an insulating char. They are often considered for exposed steel when a painted appearance is required. The specified dry-film thickness is tied to the steel section and the required rating, so it cannot be selected from a generic paint data sheet. Primer, intumescent layer and topcoat must be treated as one qualified system.
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Does data-center structural steel need to be painted?
Not automatically. AISC’s painting guidance states that steel enclosed by building finishes, in contact with concrete, or receiving contact-type fireproofing generally does not need to be primed or painted solely for corrosion protection. AISC identifies expected relative humidity above 70 percent and exposure to corroding chemicals as important exceptions. The 70 percent figure is AISC guidance, not a universal code threshold or a guarantee that steel below it will never corrode.
Evaluate the real environment rather than labeling the entire facility simply as indoor or climate-controlled. Review:
- Historical and design relative humidity, including shutdown and economizer modes.
- Condensation risk on cold surfaces, pipework and equipment near the steel.
- Roof, wall, plumbing and process-water leak paths.
- Cleaning chemicals, battery-room atmospheres, treatment chemicals and other corrosive contaminants.
- Airborne salt or industrial pollutants brought into the building.
- Locations where dirt, fibers or moisture can accumulate behind trays, partitions or equipment.
- Whether the steel will remain accessible for inspection and renewal.
Use a corrosion-protection primer, galvanizing or a complete coating system only when the exposure assessment and contract documents justify it. Select the system for the actual environment and expected maintenance, and detail the work so water and contaminants cannot become trapped.
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Coordinate corrosion protection with fireproofing
A primer that protects steel from corrosion can reduce adhesion of contact-type fireproofing. AISC advises that spray-applied material may be installed over primed or painted steel only when the coating and fireproofing combination has passed the applicable bond tests or appears on the fireproofing manufacturer’s approved primer list. Galvanized steel also requires confirmation that the selected fireproofing is qualified for that substrate.
Resolve compatibility before fabrication
- Choose the fireproofing assembly first. Identify the listing or engineered design, member limits, required thickness and exposure conditions.
- Obtain the approved-substrate requirements. Confirm whether bare, shop-primed, field-primed or galvanized steel is permitted.
- Match the corrosion system to the approved substrate. Do not substitute a convenient primer or topcoat without written confirmation from the fireproofing manufacturer and design team.
- Verify bond evidence. Obtain the applicable qualification or test documentation for the exact coating and fire-resistive material combination.
- Coordinate with the AHJ. Include the assembly evidence, preparation method and inspection plan in the submittal.
- Assign handoffs in the contract. State who removes contamination, repairs damaged shop coating, accepts the surface and releases it for fireproofing.
Make these decisions before steel is fabricated or shipped. Changing from bare steel to a shop primer after procurement can force a different fireproofing product, additional testing, rework or schedule delay.
Surface preparation and application controls
AISC’s general guidance calls for removing dirt, oil, grease and loose mill scale and following the fire-resistive material manufacturer’s instructions. “Light corrosion is fine and will not have an adverse effect on adhesion” is a statement from AISC’s described fireproofing guidance, not permission to coat severe corrosion or ignore a product’s preparation limits. Pitting, section loss, delamination or active leakage requires evaluation by the engineer and manufacturer.
Before fireproofing
- Inspect for rust, mill scale, oil, dust, weld spatter, condensation and incompatible coatings.
- Verify that the steel profile and surface condition match the approved assembly.
- Confirm primer identity, batch records, cure status and any required roughness or cleanliness.
- Measure environmental conditions against the coating and fireproofing manufacturer’s limits.
- Protect prepared steel from rain, wash water, condensation and construction contamination.
During application
- Control ambient temperature, steel temperature, humidity and ventilation as required by the product instructions.
- Apply the specified number of coats or passes and prevent sagging, voids, shadowing and unprotected edges.
- Measure wet or dry film thickness using the method required by the system.
- Record locations, readings, applicator, material batches and environmental conditions.
- Protect freshly applied material from impact, vibration, water and incompatible trades.
At handover
- Document final thickness, adhesion or bond records, repairs and inaccessible areas.
- Mark penetrations, openings and areas reserved for future equipment so later work does not damage the assembly.
- Provide the owner with current product data, maintenance limits and repair instructions.
Plan for leaks, damage and operational maintenance
Data-center operation can introduce conditions that were absent during construction. Inspect when there is evidence of a roof or pipe leak, condensation event, flooding, chemical release, impact or abnormal humidity. Look for blistering, delamination, exposed steel, rust staining, cracked SFRM, missing board, damaged joints and unsealed penetrations.
The reviewed AISC and NIST material does not establish a data-center-wide inspection interval. Set inspection triggers and intervals in the facility’s maintenance plan using the owner’s risk assessment, the approved system instructions and the engineer’s recommendations rather than adopting an invented universal schedule.
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Repair sequence
- Stop the moisture or contamination source and document the affected area.
- Determine whether steel section loss, elevated temperature exposure or substrate damage has occurred.
- Identify the original fireproofing and corrosion systems from project records.
- Ask the system manufacturer and engineer to define cleaning, preparation, repair material and thickness.
- Requalify or otherwise document the repair where the original listing requires it.
- Reinspect adjacent areas for hidden damage before returning the system to service.
Do not simply paint over rust, patch SFRM with an unapproved material or install a new primer over an unknown coating. Those actions can hide deterioration and compromise the fire-resistance assembly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Product example: PPG Steelguard 951
A September 2025 feature in Modern Steel Construction lists PPG Steelguard 951 as an epoxy intumescent fire-protection coating marketed for advanced manufacturing facilities, including data centers. The feature reports claims of up to four hours of fire protection and corrosion resistance up to ISO 12944 C5 without a topcoat.
Those are reported manufacturer or listing claims, not independent verification that a particular data-center member will achieve the stated rating. Before specifying such a product, require current manufacturer data, the applicable fire-resistance listing or engineering, the steel section and thickness schedule, approved primer and substrate combinations, application qualifications, environmental limits and AHJ acceptance.
Common specification and construction failures
Using a generic fireproofing thickness
Thickness depends on the assembly, steel section factor, rating, exposure and product. A single thickness copied from another project can be inadequate or unnecessarily expensive.
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Painting every piece of indoor steel
Unnecessary primer can add cost, delay and a bond problem without improving performance in a dry, enclosed environment. First document humidity, leaks and chemical exposure.
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Choosing corrosion protection after fireproofing
Late coating decisions can make the selected primer incompatible with SFRM or intumescent layers. Resolve the complete system before shop application.
Relying on a product name instead of assembly evidence
Listing a product as “for data centers” does not identify the member, rating, thickness, substrate or application conditions. Demand project-specific evidence.
Ignoring interfaces and penetrations
Cable trays, piping, hangers, access panels and later equipment changes can leave unprotected steel or damage a qualified enclosure. Detail and inspect every interface.
Failing to assign cleaning responsibility
Steel may arrive with shop dust, oil, damaged primer or construction debris. Contract documents must state who cleans, accepts and protects the substrate before fireproofing.
A project decision checklist
- Has the adopted code, construction classification, occupancy and required rating been documented?
- Has the AHJ confirmed the prescriptive or performance-based path?
- Does the selected assembly cover the actual member geometry, exposure and substrate?
- Is the steel bare, primed, painted or galvanized, and is that condition qualified?
- Has the facility team assessed humidity, condensation, leaks and chemical exposure?
- Are primer, corrosion coating, fireproofing and topcoat products compatible as one system?
- Are surface preparation, environmental limits, thickness measurement and repair responsibilities assigned?
- Are penetrations, access panels, future modifications and impact zones addressed?
- Are current product documents, qualification records and AHJ approvals in the project file?
- Does the operating plan identify moisture events, damage and inspection triggers?
Bottom line
Start with the required fire-resistance rating and an approved or engineered assembly. Then decide whether corrosion protection is necessary for the actual data-center environment. Dry, enclosed steel may not need routine paint, while humidity above 70 percent, chemicals, condensation or leaks may require a qualified coating system. Coordinate every primer and fireproofing layer, document preparation and thickness, and obtain AHJ acceptance before installation. This system-based approach protects both structural capacity in a fire and the long-term condition of the steel.
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