Raised access flooring can provide an adaptable platform for data-centre cabling, power distribution, airflow and maintenance. However, the floor must be specified as a complete system. Finished floor height, load performance, airflow strategy, panel construction, understructure and surface finish should all be matched to the equipment layout and project requirements.
Why are raised floors used in data centres?
A raised access floor creates a usable void between the structural subfloor and the finished floor surface. Depending on the design, this space can accommodate power cables, data cabling, containment, monitoring equipment and air distribution.
Individual floor panels can normally be lifted when access to the void is required. This can make maintenance and future alterations less disruptive than services permanently enclosed within a screed or fixed floor construction.
A raised floor is not automatically the correct solution for every facility. Some modern data centres use overhead service distribution or slab-level equipment arrangements. The decision should therefore be based on the cooling strategy, equipment layout, loading, service routes and operational requirements of the facility.
How can raised flooring support airflow and cooling?
Where the underfloor void is designed as an air-supply plenum, conditioned air can be delivered through correctly positioned floor grilles and airflow panels. These outlets are commonly coordinated with equipment rows and the wider hot-aisle or cold-aisle strategy.
Airflow performance depends on more than the percentage of open area in a grille. Plenum depth, pressure, air leakage, obstructions, cable congestion, outlet position and fan performance can all affect the amount and distribution of air reaching the equipment.
Gaskets, sealed service penetrations and suitable floor cable grommets can help control unwanted air leakage where the floor void is used as a pressurised plenum.
Flexible cable and power routing
Data centres require carefully coordinated routes for power, network cabling, fibre, monitoring systems and other services. A raised floor can keep these services accessible while separating them from the occupied equipment area.
The underfloor arrangement should account for:
- power and data separation requirements;
- cable trays and containment depths;
- bend radii and connection points;
- floor-box and grommet dimensions;
- airflow restrictions caused by congested services;
- future capacity and maintenance access; and
- fire-stopping and compartmentation requirements.
Removable panels make later access easier, but service routes still need to be planned. Uncontrolled cable accumulation can reduce available space, obstruct airflow and make maintenance more difficult.
What height should a data-centre raised floor be?
There is no universal raised-floor height for every data centre. The required finished floor level should be calculated from the deepest services, cable containment, airflow requirements, maintenance clearance, panel thickness and any bonded surface finish.
Our guide to selecting the correct raised access floor height explains the difference between finished floor level, clear service void and pedestal height, with a practical calculation method.
The chosen pedestal must remain within its approved adjustment range after the panel thickness and finish have been deducted. Doorways, ramps, adjoining floors and equipment thresholds should also be resolved before the system is ordered.
Browse our raised access floor pedestals after establishing the required pedestal setting.
Load capacity for server racks and equipment
Server racks, cooling equipment, power equipment and maintenance operations can impose concentrated and moving loads on the floor. The specification should therefore consider the actual equipment loads and how those loads are transferred through the panels and understructure.
Relevant performance values may include:
- point load: a concentrated load applied over a defined area;
- uniformly distributed load: a load spread across a wider floor area;
- rolling load: the effect of equipment moved across the floor;
- ultimate load and safety factor: values used to assess the tested margin before failure; and
- system classification: performance achieved by the complete tested panel and understructure configuration.
These measurements are not interchangeable. A panel’s uniformly distributed load must not be presented as if it were the allowable load beneath one equipment foot.
Heavy equipment may require additional pedestals, stringers, spreader plates, plinths or separate structural support. Confirm this with the equipment supplier, access-floor manufacturer and project structural designer.
View our raised access flooring panels for available panel constructions, but always verify the current technical data for the complete proposed system.
Anti-static finishes, ESD control and grounding
Electronic equipment can require control of electrostatic discharge. However, “anti-static”, static-dissipative and conductive are not interchangeable descriptions.
The required electrical resistance depends on the operational environment and applicable project specification. Performance can be affected by the floor covering, adhesive, panel construction, understructure, grounding points, humidity and maintenance regime.
Where a bonded finish is required, review the available static-dissipative vinyl floor tiles and confirm compatibility with the selected panel and grounding system.
Maintenance, access and future changes
Removable panels allow authorised personnel to inspect services, add connections and alter layouts without breaking out a permanent floor. This can support phased upgrades and reduce disruption when the facility changes.
Operational controls are still required:
- use an appropriate panel lifting tool;
- limit the number of adjacent panels removed at one time;
- provide temporary barriers around open floor areas;
- protect cables and equipment during maintenance;
- replace panels in their correct orientation and location; and
- check that altered services do not obstruct designed airflow paths.
Damaged, rocking or incorrectly seated panels should be investigated rather than packed or modified without approval.
Data-centre raised-floor specification checklist
| Design item | What to establish | Why it matters |
|---|---|---|
| Floor height | Finished floor level, clear void and pedestal setting | Ensures services fit and the pedestal remains within its approved range |
| Equipment loads | Point, rolling and distributed loads | Determines the appropriate panel and understructure performance |
| Cooling strategy | Air volume, pressure, outlet position and leakage control | Prevents the floor from undermining the designed airflow system |
| Service routes | Cables, containment, floor boxes and future capacity | Protects usable void space and maintenance access |
| Surface finish | Durability, electrical resistance and cleaning requirements | Supports the operational and ESD-control strategy |
| Fire performance | Required classifications and complete system evidence | Ensures the proposed construction matches the project fire strategy |
You can also review our guide to raised access flooring standards before comparing systems.
Frequently asked questions
What type of raised flooring is suitable for a data centre?
The appropriate system depends on the equipment loads, floor height, cooling strategy, service routes and required finish. Steel-encapsulated or heavy-grade panels may be appropriate, but suitability must be confirmed from the complete system’s current technical data.
Can a raised floor be used to cool server racks?
A raised floor can form part of an underfloor air-distribution system. Effective cooling requires a designed plenum, controlled leakage, correctly positioned airflow panels and coordination with the equipment layout and cooling plant.
How high should a data-centre raised floor be?
There is no standard height suitable for every facility. The finished floor level should be calculated from the required service void, airflow strategy, containment, maintenance clearance, panel thickness and surrounding floor levels.
How is the required floor load capacity determined?
Use the actual equipment weights, support-foot dimensions, equipment positions and proposed movement routes. These should be checked against the tested point-load, rolling-load and distributed-load performance of the complete access-floor system.
Specify your data-centre access floor
Browse our data-centre flooring range or contact our team with your required floor height, equipment loads, floor area and preferred system configuration.
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