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HardRock Roofing Board U Values
Warm flat roof, concrete deck (plasterboard and timber ceiling)
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 on screed to falls on
150mm dense concrete deck.
Ceiling finish 50mm timber battens & 12.5mm plasterboard.
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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