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HardRock Roofing Board U Values
Warm flat roof, above timber deck
Prescribed U Value W/m2K
(England and Wales) Extensions: 0.20
Renovation & Repair work: 0.25
New build requirement could range between 0.20 and 0.18
(Republic of Ireland) 0.22
(Scotland, with boiler SEDBUK) 0.25
Thickness
mm | U Values
W/m2K | 135 | 0.25 | 170(85+85) (RoI) | 0.22 | 170(85+85) | 0.20 | 180(85+95) | 0.19 | 190 (95+95) | 0.18 | 220 (85+135) | 0.16 | 270 (135+135) | 0.13 |
Construction: Hardrock Dual Density roofing boards in combination
with mechanically fastened single ply membrane systems,
19mm timber deck with 12.5mm plasterboard and
skim fixed to timber joists.
Calculations assume that insulation and membrane are of the telescopic type.
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
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