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PSA: 2021 vs BS EN 12825: 2001 - A Practical Guide to Raised Access Floor Performance Standards
When specifying a raised access floor, understanding the differences between available performance standards is critical to ensuring the system selected is fit for purpose. In the UK and Ireland markets, more than one standard is commonly referenced, and without clear guidance this can lead to misunderstanding or mis-specification.
At Tate, we work closely with architects, consultants, contractors, and end users to help translate performance standards into practical, compliant flooring solutions that meet the demands of modern buildings.
The PSA: 2021 Performance Specification (or PSA MOB PF2/SPU: 2021 to give it its full name) is a UK- and Ireland-focused, prescriptive standard that assesses raised access floor systems across a broad range of performance criteria. In addition to load performance, it also addresses installation considerations, expected service life, and operational durability.
PSA: 2021 Grade Overview and Indicative BS EN 12825: 2001 Comparison
To support informed specification, it is important to recognise that PSA: 2021 and BS EN 12825: 2001 are not equivalent standards, and any comparison should be viewed as indicative rather than a direct performance match.
| PSA: 2021 Grade |
Static Loadings |
Typical Applications | Indicative BS EN 12825 Classification | |
|
Concentrated Loads (Minimum) |
Uniformly Distributed Load (Minimum) |
|||
| Extra Heavy | 4.5 kN over 25 mm square | 12.0 kN/m² |
Data centres and server rooms with heavy equipment, specialist applications |
No comparable classification |
| Heavy | 4.5 kN over 25 mm square |
12.0 kN/m² |
Server rooms, public areas, plant and control rooms | Class 6/3/A/2 |
| Medium | 4.5 kN over 300 mm square; 3.0 kN over 25 mm square |
8.0 kN/m² |
Offices with heavy equipment, education facilities and public areas |
Class 5/3/A/2 |
| Light | 2.7 kN over 300 mm square; 1.5 kN over 25 mm square | 6.7 kN/m² |
General office use with no heavy equipment |
Class 3/3/A/2 (minimum) |
| No comparable PSA grade | — | — | Small offices with low occupancy and limited storage | Class 1/3/A/2 or Class 2/3/A/2 (minimum) |
The full PSA: 2021 Performance Specification can be downloaded from the Access Flooring Association (AFA).
Loadings Terminology
Raised access floors are classified according to their load-bearing capabilities. When specifying a system, it is important to consider not only the finished building use, but also how the floor will be used during construction and fit-out.
During these stages, raised floors may be used as working platforms, subjected to concentrated pedestrian traffic in escape routes and circulation areas, and exposed to the movement of heavy furniture and equipment. These factors should be fully accounted for, particularly when lower performance grades are under consideration.
Performance classification applies to the complete flooring system, including both panels and supporting structure supplied by the same manufacturer. For PSA compliance, performance verification must be undertaken by an approved independent laboratory. Test certificates should be reviewed periodically to ensure they remain current and relevant.
Definitions
Raised access floor systems are assessed using the following loading definitions:
Point Load
A point load is a force applied to a very small area of a raised access floor panel, such as from heavy equipment or furniture feet. It assesses how the floor performs under highly concentrated loads.
Uniformly Distributed Load
A uniformly distributed load is spread evenly across the floor surface, representing general occupancy, people, and standard furniture. It measures the floor’s ability to support overall, continuous loading.
Four Point Load
A four point load is applied at four separate contact points, typically simulating furniture or equipment with four legs. It evaluates performance under multiple concentrated loads acting at the same time.
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