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Rockfloor U Values
Block & beam suspended floor


Prescribed U Value W/m2K

 England, Wales, Extensions: 0.22
Renovation & Repair work: 0.25
New build requirement could range between 0.20 and 0.18

Republic of Ireland and
 Scotland (with boiler SEDBUK) 0.25

Because the U value for ground floors is dependent upon
size, shape, soil type perimeter edge insulation etc., it is not
possible to quote specific values. The following tables show
insulation thickness required to suit floor areas shown.

Note: Rockfloor should be laid in accordance with BS 8204: Part 1.




 Product Rockfloor
U value
 0.25 W/m2K 0.22 W/m2K0.20 W/m2 0.18 W/m2K
Exposed Perimeter
(P/A)
 Rockfloor
mm
 Thickness
mm
Thickness
mm 
 Thickness
mm
 0.1 nil305065 
 0.2 65 80 100120 
 0.3 80 100 120 140
 0.4 95 115 130 150
 0.5 100 120 135 160
 0.6 105 125 140 160
 0.7 105 130 145 165
 0.8 110 130 145 165
 0.9 115 130 150 170
 1.0 115 135 150 170

 
Rockwool Rockfloor is laid over the dense beam and block floor below screed or
t&g flooring grade chipboard where floor heights are limited.


 

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