Under floor heating
Rockfloor U Values
Below concrete ground bearing slab
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/m2K | 0.20 W/m2K | 0.18 W/m2K | Exposed Perimeter
(P/A) | Rockfloor
mm | Thickness
mm | Thickness
mm | Thickness
mm | | 0.1 | nil | nil | nil | nil | | 0.2 | 30 | 50 | 65 | 85 | | 0.3 | 60 | 80 | 95 | 115 | | 0.4 | 75 | 95 | 110 | 130 | | 0.5 | 85 | 105 | 120 | 140 | | 0.6 | 90 | 110 | 130 | 150 | | 0.7 | 95 | 115 | 130 | 150 | | 0.8 | 105 | 120 | 140 | 160 | | 0.9 | 105 | 125 | 140 | 160 | | 1.0 | 110 | 130 | 145 | 165 |
Rockwool Rockfloor can be installed below the concrete slab or below screed.
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