Specification Comparison

PSA v BSEN Specification Comparison
The PSA Specification Performance standards in the UK industry standard PSA MOB PF2 PS are well defined, straightforward and well understood.
BS EN 12825 is a method of comparing raised flooring performance using a common set of classes, which can be used as a picking list to create a “specification”.
PSA Spec Grade Static loadings Typical uses Comparable (not equivalent) BS EN 12825 classification
  Concentrated loads (Min) Uniformly distributed load (Min)  
Extra Heavy Grade 4.5 kN over 25 mm square† 12.0 kN/m² Main frame computer rooms with heavy equipment; Other special applications No comparable classification
Heavy Grade 4.5 kN over 25 mm square 12.0 kN/m² Computer rooms; Telephone exchanges; Public areas; Control rooms Class 6/3/A/2
Medium Grade 4.5 kN over 300 mm square
3.0 kN over 25 mm square*
*8.0 kN/m² General office use with heavy equipment; Educational accommodation; Public areas Class 5/3/A/2
Light Grade 2.7 kN over 300 mm square;
1.5 kN over 25 mm square
6.7 kN/m² General office use; no heavy equipment Class 3/3/A/2 (minimum)
No comparable grade     Small offices with low occupancy levels; limited use of filing cabinets, etc. Class 1/3/A/2 or Class 2/3/A/2 (minimum)
† this grade must also sustain a total load of 11 kN applied equally on four points, each point 25 mm square on a 200 mm x 200 mm 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 and how furniture / filing cabinets and other heavy equipment 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 and under structure.
Performance verification for PSA MUST be by an “approved independent laboratory”.

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