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Keep up to dateU-values for building envelope | |||
Ìý | Current U-value | Proposed new U-value after six months | Proposed new U-value after 24 months |
roof | 0.16-0.25 | 0.20-0.35 | 0.16-0.25 |
external wall | 0.35 | 0.35 | 0.30 |
ground floors | 0.25 | 0.3 | 0.25 |
average of all doors, windows and rooflights | 2.0-2.2 | 2.2 | 2.0 |
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