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Table 1: Model details
Model detailsExternal wallCeilingFloor
  k-ins t-ins U-res W/mKk-ins t-ins W/m²U-res k-ins t-ins W/m² U-res
 W/mK (mm) KW/m² K(mm) KW/m² K(mm) K
As existing n/a 0·0 n/a n/a 0·0 n/a n/a0·0 n/a
SI 1976 Part F 0·03 15·5 1·00·04 55·5 0·60 n/a 0·0 n/a
1978 Part F amendment 0·03 35·5 0·6 0·04 55·5 0·60 n/a 0·0 n/a
SI 1985 Part L 0·03 35·5 0·6 0·04 103·0 0·35 n/a 0·0 0·60
1991 Approved Document L 0·039 52·0 0·45 0·04 149·0 0·25 n/a 0·0 0·60
1995 amendment 0·039 52·0 0·45 0·04 149·0 0·25 0·03 12·6 0·45
2002 Approved Document L1 0·025 49·20·35 0·04 239·0 0·16 0·025 55·0 0·25
2000 Forward Thinking* 0·025 45·4 0·25 0·04 239·0 0·16 0·025 68·5 0·22
General Information Leaflet 72* 0·025 45·4 0·25 0·04 297·0 0·13 0·025 80·0 0·20
General Information Leaflet 72**
Advanced Standard 0·025 117·0 0·15 0·04 487·0 0·08 0·025 206·0 0·10
Notes:
U-res=required/achieved U-value
t-ins=thickness of insulation
k-ins=k-value of insulation
*/** Denotes the thickness of the insulating block is increased to between 115 - 150mm (k-value = 0.08).