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Product Tables

PSA specification

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Performance standards in the UK industry standard PSA MOB PF2 PS are well defined, straightforward and well understood by architects and contractors. They are demanding and onerous.

In terms of load carrying capability, there are four UK standards, Light Grade, Medium Grade, Heavy Grade and Extra Heavy Grade. These are arranged vertically in that each grade will comply with any grades which are lower in the scale.

The Light, Medium and Heavy grades ALL have a three times safety factor.

Testing and certification for compliance with one of the four standards MUST be carried out by an independent testing station with NAMAS accreditation.

PSA MOB PF2 PS also recognises the need to specify installation criteria as well as manufacturing standards.
Product name PSA Spec Grade Concentrated load Uniformly distributed load Guide to usage FSC®
  25MMSQ 300MMSQ  
DRF600 (with stringers)

Extra Heavy Grade

Not less than 4.5kN    Not less than 12kN/m2 Computer rooms, equipment rooms, print rooms with heavy equipment YES
DRF600

Heavy Grade

Not less than 4.5kN   Not less than 12kN/m2 Computer rooms, equipment rooms, print rooms with heavy equipment YES
RMG600 Medium Grade *Not less than 3.0kN Not less than 4.5kN *Not less than 8.0kN/m2

General office use with heavy equipment;
Educational accommodation; Public areas

YES
RLG600 Light Grade Not less than 1.5kN Not less than 2.7kN Not less than 6.7kN/m2

General office use; no heavy equipment

YES
TLM26 Medium Grade *Not less than 3.0kN Not less than 4.5kN *Not less than 8.0kN/m2

General office use with heavy equipment;
Educational accommodation; Public areas

YES
FDEB38 (with stringers)

Extra Heavy Grade

Not less than 4.5kN   Not less than 12kN/m2† Computer rooms, equipment rooms, print rooms with heavy equipment YES
FDEB38 (with stringers)

Heavy Grade

Not less than 4.5kN   Not less than 12kN/m2 Computer rooms, equipment rooms, print rooms with heavy equipment YES
FDEB30 Medium Grade Not less than 3.0kN Not less than 4.5kN Not less than 8.0kN/m2 Computer rooms, equipment rooms, print rooms with heavy equipment YES

† This grade is also required to sustain a total load of 11kN applied equally on four points, each point 25mm sq. on a 200mm x 200mm square configuration at any point on the system.

* British Council for Offices Guide to Specification 2014

Consideration should be taken regarding use of the raised floor as a working platform during construction, pedestrian traffic in escape routes, main thoroughfares etc. & how furniture / filing cabinets and other heavy equipment etc. will be taken into the building (across the floor) especially if the lower classification is being considered.

Classification by grade is based upon a complete Kingspan system i.e. panels & under structure.

Performance verification for PSA MUST be by an “approved independent laboratory”.

BS EN specification

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BS EN 12825 is a method of comparing raised flooring performance using a common test method and allows for a large number of classes, which can be used as a picking list to create a “specification”. The BS EN specification is commonly found outside of the UK, in Europe and around the world.

  • Classes of element, six classes
  • Classes of deflection, three classes
  • Safety factor, two classes
  • Deviation on panel dimensions, two classes

There are therefore 72 classes to select from when writing a specification!
Because these performance standards are not arranged vertically there is great potential for misunderstanding, and advice should be sought on how to select a raised access flooring system suitable for the building concerned.

BS EN 12825 does not require independent testing: normally the manufacturer’s results are deemed to be acceptable.

BS EN 12825 does not recognise the need to specify installation criteria.

Product name Working load Ultimate load BS EN 12825 class Guide to usage FSC®
RG6

4kN 

In excess of 12kN Class 6/3/A/2 General office areas YES
RG5

3.33kN 

In excess of 10kN Class 5/3/A/2 General office areas YES
RG3

2.67kN 

In excess of 8kN Class 3/3/A/2 General office use, no heavy equipment YES
RG2

2kN 

In excess of 6kN Class 2/3/A/2 Small offices with low occupancy levels; limited use of filing cabinets YES
FDEB 6

4kN 

In excess of 12kN Class 6/3/A/2 Computer rooms; equipment rooms, print rooms YES
FDEB 4

3kN 

In excess of 9kN Class 4/3/A/2 Computer rooms; equipment rooms, print rooms YES
FDEB 1

1.33kN 

In excess of 4kN Class 1/3/A/2 Equipment rooms; limited use of heavy equipment YES
TL5

3.33kN 

In excess of 10kN Class 5/3/A/2 General office areas YES
TL3

2.67kN 

In excess of 8kN Class 3/3/A/2 General office use, no heavy equipment YES

† based upon a 3 times safety factor.

Consideration should be taken regarding the use of the raised floors as a working platform during construction, pedestrian traffic in escape routes, main thoroughfares etc. & how furniture / filing cabinets and other heavy equipment etc. will be taken into the building (across the floor) especially if the lower classification is being considered.

Classification by class is based upon a complete Kingspan system i.e. panels & understructure.

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