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PSA (MOB PF2 PS/SPU) Key Performance
MOB PF2 PS/Spu Specification:
The Property Services Agency (PSA) Method of Building Performance Specification 'Platform Floors (Raised Access Floors)', MOB PF2 PS , became the industry standard in the UK and has been for around 20 years until the recent arrival of the BS EN 12825:2001 specification.
This specification consists of performance requirements verifiable by standard testing procedures. Requirements covered include dimensional accuracy, moisture and thermal movement, strength grades, fire safety, floor panel finishes and electrical bonding and continuity. The latest edition being (March 1992) of the MOB PF2 PS was given the suffix SPU (single project use).
It was produced in conjunction with the Access Flooring Association (AFA) which RMF are a founder member and includes changes that affect nomenclature making it more relevant for non-government contracts; the performance requirements and test methods remain unchanged.
The table below shows the structural performance of each of the four grades of raised access floor outlined by the MOB PF2 PS/Spu and key performance, specification along with typical areas of application.
| Grade |
Area of use |
Concentrated static load |
Uniformly distributed load |
Safety Factor |
| Over a 300mm Square |
Over a 25mm Square |
| Light |
General office accommodation with no heavy equipment |
At least 2.7 kN |
At least 1.5 kN |
At least 6.7 kN/m² |
3 x load for 5 mins |
| Medium |
General office accommodation with heavy equipment. Data preparation areas, educational accommodation, public areas. |
At leasr 4.5 kN |
At least 3 kN |
At least 8 kN/m² |
3 x load for 5 mins |
| Heavy |
Computer rooms including comms rooms, telecom switch rooms etc. |
- |
At least 4.5 kN |
At least 12 kN/m² |
3 x load for 5 mins |
| Extra Heavy |
Computer rooms, data centres, print rooms and other areas with heavy equipment. Specialist applications. |
- |
At least 4.5 kN |
At least 12 kN/m² |
2 x load for 5 mins |
| This grade also required to sustain a total load of 11kN applied equally on four points, each point 25mm square on a 200 x 200mm square configuration |
PSA (MOB PF2 PS/SPU) Full Document March 1992
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BSEN 12825 - Key Performance
In July 2001 a European Standard EN 12825 was approved by CEN as a voluntary specification for private projects and mandatory for public projects. This standard is now mandatory for all projects across the member states of the EU. This specification outlines classifications for raised access floor systems based on their ultimate load; this is the load at which failure occurs. The raised access floor system is tested to its ultimate load under the application of a 25mm x 25mm point load at a predetermined rate until failure occurs. During the application of this load the deflection of the floor panel is measured to produce a graph of applied load against deflection. This information is then used to determine the classification of the floor system. Raised floor systems are classified in terms of ultimate load, safety factor, deflection under working load and dimensional tolerances.
The classification system allows for six classes of ultimate load ranging from greater than 4kN to greater than 12kN. Against each of these six ultimate loads there is a choice of a safety factor of 3 or 2. Further for each of these ultimate load and safety factors three maximum deflections under working load conditions are available namely 2.5mm, 3.0mm and 4mm.
What BS EN 12825 does not intend to do is interpret the classifications or advise which class of raised access floor would be suitable for a specific application. The product application chart shown below gives guidance as to product classification against specific areas of application. These classifications are based upon the ultimate load determined in the manner prescribed within BS EN 12825. Further these classifications are based on a 2.5mm deflection under working load conditions and a safety factor of 3, these are best suited for most applications when taking due regard for the UK construction industry and the expectations of raised access flooring with regard to panel deflection etc.
Therefore a typical classification might be outlined as 3/A/3/2 where;-
- 3 is the ultimate load class in excess of 8kN
- A is the deflection under instantaneous working load of less than 2.5mm
- 3 is the safety factor
- 2 is the dimensional tolerances classification
| RMF Floor |
BS EN 12825 Classification |
Finished Floor Height (FFH) |
| Light Use |
Standard Use |
Heavy Use |
Service Void |
Heavily Serviced & HVAC |
Floor Finished |
| General Office |
1/A/3/2 |
3/A/3/2 |
5/A/3/2 |
50 - 150mm |
300 - 450mm |
Carpet Tiles |
| |
1.33kN working load |
2.67kN working load |
3.3kN working load |
|
| Service Corridors |
1/A/3/2 |
3/A/3/2 |
5/A/3/2 |
50 - 150mm |
300 - 450mm |
Carpet Tiles |
| |
1.33kN working load |
2.67kN working load |
3.3kN working load |
|
| Computer Rooms |
1/A/3/2 |
4/A/3/2 |
6/A/3/2 |
N/A |
300 - 600mm |
Vinyl / HPL |
| |
3kN working load |
4kN working load |
4kN working load |
|
| Data Centre |
4/A/3/2 |
6/A/3/2 |
6/A/3/2 |
N/A |
300 - 600mm |
Vinyl / HPL |
| |
3kN working load |
4kN working load |
4kN working load |
|
| Comms Room |
1/A/3/2 |
4/A/3/2 |
6/A/3/2 |
300 - 450mm |
300 - 600mm |
Vinyl / HPL |
| |
1.33kN working load |
3kN working load |
4kN working load |
|
| Reception Areas |
2/A/3/2 |
3/A/3/2 |
5/A/3/2 |
50 - 150mm |
300 - 450mm |
Carpet Tiles |
| |
2kN working load |
2.67kN working load |
3.3kN working load |
|
Speciality finishes |
| Educational |
1/A/3/2 |
3/A/3/2 |
5/A/3/2 |
50 - 150mm |
300 - 450mm |
Carpet Tiles |
| |
1.33kN working load |
2.67kN working load |
3.3kN working load |
|
| Print Rooms |
4/A/3/2 |
6/A/3/2 |
6/A/3/2 |
150 - 300mm |
300 - 450mm |
Vinyl |
| |
3kN working load |
4kN working load |
4kN working load |
|
Rubber |
| Call Centres |
2/A/3/2 |
3/A/3/2 |
5/A/3/2 |
150 - 450mm |
300 - 450mm |
Carpet Tiles |
| |
2kN working load |
2.67 working load |
3.3kN working load |
|
| Trading Floors |
3/A/3/2 |
5/A/3/2 |
6/A/3/2 |
150 - 300mm |
300 - 450mm |
Carpet Tiles |
| |
2.67kN working load |
3.3kN working load |
4kN working load |
|
| Retail |
4/A/3/2 |
6/A/3/2 |
6/A/3/2 |
50 - 150mm |
300 - 450mm |
Vinyl |
| |
3kN working load |
4kN working load |
4kN working load |
|
Speciality finishes |
| Light Industrial |
4/A/3/2 |
6/A/3/2 |
6/A/3/2 |
300 - 450mm |
300 - 450mm |
Vinyl / HPL |
| |
3kN working load |
4kN working load |
4kN working load |
|
Speciality finishes |
RMF K41 Raised Floor Specification
RMF Installation Guidelines
RMF Installation Guidelines 2022
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