Common Mistakes When Specifying Structural Aluminum for Data Center Construction
XSF Truss | Last Updated: July 2026
The most common mistake when specifying structural aluminum for data center construction is sizing load rating off the empty structure instead of its fully loaded weight, which causes rework once cable, containment, or equipment loads are added. The other recurring mistakes are skipping field measurements, underspecifying finish, and leaving out engineering stamps for out-of-state projects.
Mistakes and Fixes
| If your spec has this mistake… | Then fix it by… |
|---|---|
| Load rating based on empty structure weight | Recalculating against fully loaded weight, including future cable or equipment fill |
| Catalog dimensions instead of field measurements | Measuring the actual aisle, rack row, or plenum on site before finalizing the spec |
| No finish specified for humid or cooling-adjacent zones | Adding powder coat or clear anodize wherever the structure sits near cooling infrastructure |
| Missing engineering stamp for an out-of-state project | Confirming stamp requirements for the project’s jurisdiction before ordering |
| Custom fabrication ordered without a test-fit step | Confirming the fabricator test-fits the assembly before it ships |
Key Takeaways
- Loaded weight, not empty weight, is the right basis for load rating. Structures sized to empty weight fail to account for cable fill, containment hardware, or equipment added after installation, which shows up as a capacity problem later.
- Field measurements catch what drawings miss. As-built conditions drift from original drawings over time, so a spec based only on catalog or drawing dimensions risks a frame or support that doesn’t match the real layout.
- Finish gets skipped until corrosion becomes a problem. Structures near cooling towers, CRAC/CRAH units, or other humid zones need powder coat or anodize specified up front, not added after corrosion shows up.
- Engineering stamps get missed on out-of-state projects. A GC or EPC sourcing structural aluminum for a project outside their home state needs to confirm stamp requirements before ordering, not after inspection.
- Skipping test-fit trades a small time savings for a bigger on-site risk. An assembly that isn’t test-fit before shipping can surface alignment or connection problems during installation, when they’re far more expensive to fix.
Examples
Cable tray sized to empty weight. A GC specified cable tray support based on the tray’s empty weight. Once fiber and copper runs were fully loaded, the support was under capacity and had to be reinforced after installation, a cost and delay that field-checking the loaded weight up front would have avoided.
Containment frame built to catalog dimensions. A facility manager ordered containment frames sized to a standard catalog width without measuring the actual aisle. Two aisles were narrower than spec, creating gaps that undercut the containment strategy until custom frames were fabricated to replace them.
Missing stamp on an out-of-state build. An EPC firm ordered structural aluminum for a project outside Texas without confirming the local engineering stamp requirement, which delayed inspection until the stamp was obtained after the fact.