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Rockwool Cavity U Values
External masonry cavity wall (Aercrete block/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)
Render, 100mm Aercrete 7N block outer skin (0.190 W/mK), Rockwool Cavity full fill, 100mm Aercrete 7N block inner skin (0.190 W/mK) .Internal finishes: (a) plaster (b) plasterboard on dabs
Internal
Block
block λ
(100mm
Block) | 750kg/m3
Aircrete
7N
0.190
W/mK | | | Internal finish | a | b | Thickness
mm | | | | 65 | 0.34 | 0.33 | | 80 | 0.30 | 0.29 | | 90 | 0.28 | 0.27 | | 100 | 0.26 | 0.25 | | 110 | 0.24 | 0.23 | | 120 | 0.23 | 0.22 |
U value calculations are based on BS EN ISO 6946 (combined method) using S/steel ties. |
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