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Rockwool Flexi - U Values
Suspended timber joisted 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.
Product
U value | 0.25 W/m2K | 0.22 W/m2K | 0.20 W/m2K | 0.18 W/m2K | Exposed Perimeter
(P/A) | Thickness
mm | Thickness
mm | Thickness
mm | Thickness
mm | | 0.1 | nil | nil | 50 | 70 | | 0.2 | 70 | 90 | 120 | 140 | | 0.3 | 90 | 120 | 140 | 160 | | 0.4 | 120 | 140 | 150 | 180 | | 0.5 | 120 | 140 | 160 | 200 | | 0.6 | 120 | 140 | 180 | 200 | | 0.7 | 120 | 140 | 180 | 200 | | 0.8 | 140 | 140 | 180 | 200 | | 0.9 | 140 | 140 | 180 | 200 | | 1.0 | 140 | 140 | 180 | 200 |
Construction: Rockwool Flexi is installed between joists, supported by polypropylene netting. The insulation should be fitted as close as practical to the underside of floor deck to avoid any air gaps.
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
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