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Rockwool Cavity U Values
External masonry cavity wall, Brick/block
Prescribed U Value W/m2K
(England and Wales) Extensions: 0.30
Renovation & Repair work: 0.35
New build requirement could range between 0.28 and 0.25
(Republic of Ireland) 0.27
(Scotland, with boiler SEDBUK ) 0.30
U Values (W/m2K)
102mm Facing brick outer skin, Rockwool Cavity full fill, internal concrete block 100mm.
Internal finishes: (a) plaster (b) plasterboard on dabs
Internal
Block
block λ
(100mm
Block) | 1900-2250kg/m3
Dense
1.1130 W/mK | | 1400-1450 kg/m3
Med/Light
0.510
W/mK | | 750kg/m3
Aircrete
7N
0.190
W/mK | | 600kg/m3
Aircrete
0.190
W/mK | | 470kg/m3
Aircrete
0.110
W/mK | | | Internal finish | a | b | a | b | a | b | a | b | a | b | Thickness
mm | | | | | | | | | | | | 65 | 0.45 | 0.43 | 0.43 | 0.41 | 0.39 | 0.37 | 0.38 | 0.36 | 0.35 | 0.34 | | 80 | 0.38 | 0.37 | 0.37 | 0.35 | 0.34 | 0.32 | 0.33 | 0.32 | 0.31 | 0.30 | | 90 | 0.35 | 0.34 | 0.34 | 0.32 | 0.31 | 0.30 | 0.30 | 0.29 | 0.29 | 0.28 | | 100 | 0.32 | 0.31 | 0.31 | 0.30 | 0.28 | 0.27 | 0.28 | 0.27 | 0.26 | 0.26 | | 110 | 0.29 | 0.28 | 0.28 | 0.28 | 0.26 | 0.26 | 0.26 | 0.25 | 0.25 | 0.24 | | 120 | 0.27 | 0.26 | 0.27 | 0.26 | 0.25 | 0.24 | 0.24 | 0.24 | 0.23 | 0.23 |
U value calculations are based on BS EN ISO 6946 (combined method) using S/steel ties. |
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Rockwool Limited, Pencoed, Bridgend, CF35 6NY, UK
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