Fire Protection Design Requirements: Vantage Data Centers VA4 Campus, Stafford County, Virginia

Meta Description: Fire protection design requirements for Vantage Data Centers' $2B VA4 campus in Stafford County, VA — Virginia NFPA editions and system selection guidance.

Section 1: Project Overview

In November 2025, Vantage Data Centers announced a $2 billion investment to develop its fourth Virginia campus — VA4 — in Stafford County in the Fredericksburg region. The campus will consist of three two-story data center buildings totaling approximately 929,000 square feet on 82 acres. At full build-out, VA4 will deliver 192 megawatts of critical IT load, designed at an average density of 500 kW per rack row. DPR Construction is the general contractor. Dominion Energy will supply power to the site. The first building is targeted to be operational in late 2027, with subsequent phases continuing through 2028.

VA4 expands Vantage's Virginia footprint to 782 MW and brings the company's cumulative in-state investment to approximately $8 billion. The campus is designed to achieve LEED Silver certification and uses a closed-loop chilled water system to limit on-site water consumption. Located about an hour south of the established Data Center Alley corridor in Loudoun County, VA4 is part of a broader market shift southward along I-95 as land and power capacity tighten in Northern Virginia's core market.

Section 2: Fire Protection Challenges Specific to This Project

A campus of this scale — three large-footprint buildings totaling 929,000 square feet — presents fire protection design challenges that do not appear in standard commercial work.

High-density IT load in contained aisles. An average rack row density of 500 kW creates a concentrated thermal environment. Conventional spot-type smoke detectors do not respond fast enough to detect the earliest stages of an electrical fire in a densely loaded aisle before equipment damage is significant. Air-sampling smoke detection (ASD) systems are the detection technology of record for this application.

Concealed spaces and raised-floor plenums. Whether the facility uses raised-floor under-floor cooling or hot aisle/cold aisle containment enclosures, NFPA 72-2019 Table 17.7.3.2.1 requires that smoke detection address concealed spaces separately from the occupied area above. ASD sampling pipe routed through plenums is typically the solution, but sampling pipe design, hole sizing, and transport time calculations must be engineered to the listed performance threshold.

Pre-action sprinkler system configuration. Open-area IT spaces at hyperscale facilities require pre-action sprinkler systems rather than wet pipe to eliminate the risk of unintended water discharge onto energized equipment. The interaction between the pre-action releasing panel, the fire alarm control unit, and the facility's electrical shutdown sequence must be fully coordinated in the design. Single-interlock versus double-interlock configuration is a consequential decision that should be documented in a basis-of-design narrative and discussed with the AHJ before permit submittal.

Clean agent suppression in critical electrical rooms. Battery rooms, UPS rooms, switchgear rooms, and generator paralleling rooms typically require clean agent fire suppression. Agent selection, protected enclosure integrity testing, hold time, and nozzle placement are all design variables governed by NFPA 2001.

Lithium-ion BESS. Large-scale UPS backup for a 192 MW campus may involve lithium-ion battery energy storage systems, which present a thermal runaway hazard not adequately addressed by conventional sprinkler response alone. NFPA 855 governs BESS installation and must be coordinated with the fire protection scope.

Section 3: Required Systems and Applicable Codes

The project is located in Stafford County, Virginia. Virginia's 2021 Uniform Statewide Building Code (VUSBC), based on the 2021 International Building Code (IBC), took full effect January 18, 2025, and is the governing building code for projects permitted on or after that date. Virginia also enforces the Virginia Statewide Fire Prevention Code, based on the 2021 International Fire Code (IFC) with state and local amendments.

The campus occupancy is Group B (Business) under IBC 2021. Group B occupancies over 12,000 square feet require automatic sprinkler protection throughout under IBC 2021 Section 903.2.

NFPA 72-2019 and NFPA 13-2019 are confirmed as the editions referenced in Virginia's 2021 VUSBC. Editions for NFPA 2001, NFPA 75, and NFPA 855 should be confirmed with the Stafford County Building and Fire Departments prior to design commencement, as local amendments or local adoption of more current editions may apply.

Section 4: What Designers Need to Think Through

ASD system design. Air-sampling detection for an IT space of this scale requires careful transport time analysis. NFPA 72-2019 Section 17.7.5.3 limits the time from smoke entering the most remote sampling port to alarm annunciation. Long pipe runs in large halls can fail this requirement without deliberate hydraulic design of the sampling network. Software-based pipe analysis tools are standard practice; field-improvised layouts are not adequate for AHJ submittal.

Pre-action interlock selection. A single-interlock pre-action system requires only automatic detection to open the deluge valve; water is held back by the closed sprinkler heads. A double-interlock system requires both detection and a sprinkler head to operate before water enters the piping — adding a second layer of protection against accidental discharge. For a 192 MW facility, most owners will require double-interlock configuration, but this adds complexity to the releasing logic and the air supervision system, both of which must be correctly specified.

Suppression sequencing with EPSS. Any clean agent system must be sequenced with the facility's emergency power supply system under a documented control matrix. The fire protection designer must understand which loads de-energize before agent release, which UPS circuits remain live, and how the EPSS interacts with the damper control and exhaust fan sequencing for the post-discharge purge cycle.

Early AHJ engagement in Stafford County. Stafford County is not part of the established data center review corridor in Loudoun County. The Stafford County Fire Marshal's Office and Building Department should be engaged in pre-application meetings before design development to establish submittal requirements, plan review expectations, and any local interpretations of the adopted code.

Section 5: How ProTech CDS Approaches Projects Like This

ProTech CDS provides fire protection design services for large-format data center projects, from schematic design through permitted construction documents. On projects involving pre-action systems, air-sampling detection, and clean agent suppression, NICET IV review and PE seals are available in all 50 states, including Virginia, when the AHJ requires them.

For owners and general contractors working under design-build or EPC delivery, ProTech CDS offers white-label fire protection design that integrates directly with your MEP coordination workflow. We coordinate with electrical, mechanical, and BIM teams and can work within your documentation structure. If VA4 or a similar data center project is on your schedule, you can submit a project inquiry at lockin.protechcds.com.

Section 6: Call to Action

ProTech CDS is available for fire protection design on data center projects in Virginia and nationwide, with NICET IV review and PE seals when the AHJ requires them. Submit your project details at lockin.protechcds.com.