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HardRock Roofing Board U Values 

Warm flat roof, metal 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

150

 0.25

 170 (85+85)

 0.22

190 (95+95)

 0.20

200 (95+105)

 0.19

 210 (105+105)

 0.18

 240 (105+135)

 0.16

 285 (135+150)

 0.13



Construction
: Hardrock Dual Density roofing boards in combination
with mechanically fastened single ply membrane systems.
 Troughed steel decking without underlining.
Calculations assume that insulation and membrane are of the telescopic type.


 


 

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