Microsoft MNZ Data Centre: Steel Detailing Case Study

Microsoft MNZ Data Centre: Steel Detailing Case Study

Project Overview

End-to-end steel for a data centre, released in 12 weeks


The Microsoft MNZ Data Centre in Bristow, Virginia, is a commercial data center facility where Moldtek delivered end-to-end steel detailing across both primary and secondary structures, 4,300 metric tons in total. The primary framing covered Levels 2, 3 and 4, a sloped roof, a platform above the roof, and a slab at roof level; the secondary scope added generator-yard steel, pipe racks, and cable trays. What made it demanding was the combination of complex connections and roof-level coordination: column splices, vertical braces, sloped shear and moment connections, and multiple roof-platform zones that needed supplier input, all delivered on a tight 12-week schedule.

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Tekla model of the Microsoft MNZ Data Centre primary and secondary steel, Bristow, Virginia
0 MT
Steel tonnage
L2–L4
Primary framing levels
0
Weeks to release
The Challenge

Complex connections, supplier coordination and roof-level complexity


The difficulty in the MNZ data centre was connections and coordination under a very tight clock. Column splices and vertical braces, sloped shear and moment connections, and multiple roof-platform zones that could only be finalized with supplier input were all resolved through continuous clarification inside a 12-week schedule.

Complex splice and brace conditions

The column splices and vertical braces required disciplined detailing review.

Sloped shear and moment connections

The sloped shear and moment connections demanded close coordination with the design intent.

Multiple roof-platform steel zones

The roof-platform zones needed supplier input on dimensions and locations before they could be detailed.

Interfaces with other trades

The trade interfaces required continuous clarification and issue resolution.

Proactive RFIs

Proactive RFIs kept the project moving inside the 12-week schedule.

Microsoft MNZ Data Centre steel model with vertical brace and roof platform coordination callouts
Moldtek’s Approach

Model the primary, coordinate the secondary, drive the RFIs


  • Primary steel modeled first

    Levels 2 to 4 and the roof were modeled before the secondary scope was coordinated.

  • Secondary steel coordinated

    The generator yard, pipe racks, and cable trays were coordinated across the facility.

  • Roof-level interfaces resolved before they blocked

    Supplier-dependent roof-platform zones were resolved with suppliers before they became blockers.

  • RFIs driven proactively

    Short clarification cycles kept connection design intent, supplier dimensions, and trade interfaces from stalling the model.

Execution Timeline

12 weeks, front-loaded on supplier-dependent conditions


Proactive RFI tracking through the coordination and QA/QC phases is what kept the connection and roof-level questions resolving inside the 12 weeks rather than backing up against the release.

Week 0Week 12
Kickoff
Kickoff
Requirements reviewed.
Inputs
Inputs and setup
Primary steel scope confirmed.
Modelling
Modelling
Levels 2, 3 and 4, sloped roof, platform and slab modeled.
Coordination
Coordination
Secondary steel and roof-level interfaces coordinated with suppliers.
QA/QC
QA/QC and RFIs
Connection and roof-level questions resolved proactively.
Release
Release-ready output
Drawings released for fabrication.
Tools & Standards

End-to-end detailing delivered on a tight schedule


The data centre was detailed on Moldtek’s standard toolchain and delivered against US structural codes; most unexposed steel painted, some exposed steel galvanised, and select elements fireproofed.

Detailing toolchain

Tekla Structures SDS/2 AutoCAD Advance Steel Navisworks

Codes & standards

AISC AWS D1.1 OSHA ISO 9001:2015
The Outcome

End-to-end detailing delivered on a tight schedule


A structured approach across primary steel, secondary steel, connection coordination, and disciplined QA/QC translated a 4,300-MT data-centre scope into release-ready steel.

Microsoft MNZ Data Centre building rendered view
4,300 MT

Primary + secondary, clearly scoped

A clear detailing scope for both the primary and the secondary steel.

L2–L4

Suppliers and trades coordinated

Strong coordination across the suppliers and the trades on complex roof-level conditions.

12 wks

Release-ready, on schedule

Release-ready deliverables produced on a tight 12-week schedule.

At a Glance

Project specifications


LocationBristow, Virginia, USA
Building typeCommercial data center
Steel tonnage4,300 MT (metric tons)
Primary framingLevels 2, 3 and 4; sloped roof; platform above the roof; slab at roof level
Secondary steelGenerator-yard steel, pipe racks, cable trays
Defining conditionsComplex connections (splices, braces, sloped shear & moment); roof-platform zones needing supplier input
Schedule12 weeks, kickoff to release-ready
FinishMost unexposed steel painted, some exposed steel galvanised, select elements fireproofed
ScopePrimary + secondary steel, connection detailing, roof-level coordination, RFI management
Why it worked

“Primary steel over three levels plus a sloped roof and a roof platform; secondary steel for the generator yard, pipe racks and cable trays — clean and released in 12 weeks.”

Moldtek Detailing Team

Data Center Steel Detailing · Microsoft MNZ Data Centre

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