Thermal bridging ψ-values and f-values for walls fully filled with mineral wool thermal insulation.
The models given in this document cover:
Ultralightweight aggregate blocks with λ not exceeding 0.28 W/mK
Lightweight aggregate blocks with λ not exceeding 0.60 W/mK
Dense aggregate blocks with λ not exceeding 1.33 W/mK
Summary of ψ-values
SAP 2012 Table K1 ref: E1
Junction Detail: Steel lintel with perforated steel base plate
SAP2012 Approved ψ-value (W/mK): 0.50
SAP2012 Default ψ-value (W/mK): 1.00
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.292 to 0.313
Lightweight: 0.346 to 0.358
Dense: 0.390 to 0.408
CBA detail ref: E1 FF CBA-312A
SAP 2012 Table K1 ref: E1
Junction Detail: Keystone Hi Therm Lintel HTS 100 & 150
SAP2012 Approved ψ-value (W/mK): 0.50
SAP2012 Default ψ-value (W/mK): 1.00
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.030 to 0.050
Lightweight: 0.028 to 0.049
Dense: 0.027 to 0.049
CBA detail ref: E1 FF CBA-312
SAP 2012 Table K1 ref: E2
Junction Detail: Other lintels (including other steel lintels)
SAP2012 Approved ψ-value (W/mK): 0.30
SAP2012 Default ψ-value (W/mK): 1.00
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.020 to 0.028
Lightweight: 0.018 to 0.024
Dense: 0.017 to 0.021
CBA detail ref: E2 FF CBA-313
SAP 2012 Table K1 ref: E3
Junction Detail: Sill
SAP2012 Approved ψ-value (W/mK): 0.04
SAP2012 Default ψ-value (W/mK): 0.08
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.015 to 0.021
Lightweight: 0.013 to 0.020 Dense: 0.013 to 0.021 CBA detail ref: E3 FF CBA-314
SAP 2012 Table K1 ref: E4
Junction Detail: Jamb
SAP2012 Approved ψ-value (W/mK): 0.05
SAP2012 Default ψ-value (W/mK): 0.10
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.010 to 0.017
Lightweight: 0.009 to 0.016
Dense: 0.008 to 0.016
CBA detail ref: E4 FF CBA-315
SAP 2012 Table K1 ref: E5
Junction Detail: Ground Floor (Normal)
SAP2012 Approved ψ-value (W/mK): 0.16
SAP2012 Default ψ-value (W/mK): 0.32
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.056 to 0.065
Lightweight: 0.091 to 0.108
Dense: 0.145 to 0.178
CBA detail ref: E5 FF CBA-301
Cert 301 – Beam and block
Cert 302 – Slab on ground
SAP 2012 Table K1 ref: E6
Junction Detail: Intermediate floor within a dwelling
SAP2012 Approved ψ-value (W/mK): 0.07
SAP2012 Default ψ-value (W/mK): 0.14
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.000 to 0.001
Lightweight: 0.000
Dense: 0.000 to 0.002
CBA detail ref: E6 FF CBA-303
SAP 2012 Table K1 ref: E7
Junction Detail: Intermediate floor between dwellings*
SAP2012 Approved ψ-value (W/mK): 0.07
SAP2012 Default ψ-value (W/mK): 0.14
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.0.65 to 0.104
Lightweight: 0.065 to 0.105
Dense: 0.066 to 0.108
CBA detail ref: E7 FF CBA-304
SAP 2012 Table K1 ref: E10
Junction Detail: Eaves (Insulation at Ceiling Level)
SAP2012 Approved ψ-value (W/mK): 0.06
SAP2012 Default ψ-value (W/mK): 0.12
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.101 to 0.115
Lightweight: 0.106 to 0.122
Dense: 0.110 to 0.127
CBA detail ref: E10 FF CBA-308
SAP 2012 Table K1 ref: E11
Junction Detail: Eaves (insulation at rafter level)
SAP2012 Approved ψ-value (W/mK): 0.04
SAP2012 Default ψ-value (W/mK): 0.08
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: -0.005 to 0.007
Lightweight: -0.007 to 0.007
Dense: -0.006 to 0.008
CBA detail ref: E11 FF CBA-309
SAP 2012 Table K1 ref: E12
Junction Detail: Gable (insulation at ceiling level)
SAP2012 Approved ψ-value (W/mK): 0.24
SAP2012 Default ψ-value (W/mK): 0.48
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.050 to 0.058
Lightweight: 0.077 to 0.087
Dense: 0.116 to 0.132
CBA detail ref: E12 FF CBA-310
SAP 2012 Table K1 ref: E13
Junction Detail: Gable (insulation at rafter level)
SAP2012 Approved ψ-value (W/mK): 0.04
SAP2012 Default ψ-value (W/mK): 0.08
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.055 to 0.059
Lightweight: 0.073 to 0.076
Dense: 0.088 to 0.091
CBA detail ref: E13 FF CBA-311
SAP 2012 Table K1 ref: E16
Junction Detail: Corner (normal)
SAP2012 Approved ψ-value (W/mK): 0.09
SAP2012 Default ψ-value (W/mK): 0.18
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.046 to 0.059
Lightweight: 0.051 to 0.068
Dense: 0.054 to 0.074
CBA detail ref: E16 FF CBA-316
SAP 2012 Table K1 ref: E17
Junction Detail: Corner (inverted – internal wall area greater than external area)
SAP2012 Approved ψ-value (W/mK): -0.09
SAP2012 Default ψ-value (W/mK): 0.00
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: -0.111 to -0.067
Lightweight: -0.119 to -0.070
Dense: -0.112 to -0.070
CBA detail ref: E17 FF CBA-317
SAP 2012 Table K1 ref: E18
Junction Detail: Party (separating) wall between dwellings*
SAP2012 Approved ψ-value (W/mK): 0.03
SAP2012 Default ψ-value (W/mK): 0.06
Calculated CBA Full-fill ψ-value (W/mK): Ultra-lightweight: 0.055 to 0.087
Lightweight: 0.056 to 0.092
Dense: 0.058 to 0.096
CBA detail ref: E18 FF CBA-305
SAP 2012 Table K1 ref: E20
Junction Detail: Exposed Floor (Normal)
SAP2012 Default ψ-value (W/mK): 0.32
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.138 to 0.159 Lightweight: 0.204 to 0.220 Dense: 0.310 to 0.317 CBA detail ref: E20-C-A1 Timber floor over garage or drive-through/side wall
Ultra-lightweight: 0.226 to 0.239 Lightweight: 0.233 to 0.245 Dense: 0.241 to 0.254 CBA detail ref: E20-C-A2 Concrete floor over drive- through/side wall
Ultra-lightweight: 0.090 to 0.178 Lightweight: 0.092 to 0.232 Dense: 0.095 to 0.293 CBA detail ref: E20-C-A3 Concrete floor over garage or drive-through / opening
Ultra-lightweight: 0.076 to 0.082 Lightweight: 0.129 to 0.140 Dense: 0.225 to 0.243 CBA detail ref: E20-T-A1 Timber floor over garage/side wall
Ultra-lightweight: 0.101 to 0.108 Lightweight: 0.142 to 0.150 Dense: 0.1910 to 0.200 CBA detail ref: E20-T-A2 Timber floor over drive-through/side wall
Ultra-lightweight: 0.139 to 0.150 Lightweight: 0.139 to 0.151 Dense: 0.139 to 0.151 CBA detail ref: E21-T-A2 Timber floor over drive-through/side wall
SAP 2012 Table K1 ref: E21
Junction Detail: Exposed floor (inverted)
SAP2012 Default ψ-value (W/mK): 0.32
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.146 to 0.052 Lightweight: 0.0127 to 0.132 Dense: 0.252 to 0.256 CBA detail ref: E21-C-A1 Concrete floor over garage/side wall
Ultra-lightweight: 0.163 to 0.168 Lightweight: 0.162 to 0.167 Dense: 0.163 to 0.167 CBA detail ref: E21-C-A2 Concrete floor over drive-through/side wall
Ultra-lightweight: 0.055 to 0.065 Lightweight: 0.115 to 0.127 Dense: 0.192 to 0.250 CBA detail ref: E21-T-A1 Timber floor over garage/side wall
Ultra-lightweight: 0.139 to 0.150 Lightweight: 0.139 to 0.151 Dense: 0.139 to 0.151 CBA detail ref: E21-T-A2 Timber floor over drive-through/side wall
SAP 2012 Table K1 ref: E24
Junction Detail: Eaves (Insulation at ceiling level – inverted)*
SAP2012 Default ψ-value (W/mK): 0.24
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.090 to 0.105 Lightweight: 0.087 to 0.103 Dense: 0.087 to 0.104 CBA detail ref: E24-1-C-A Pitched roof over addition/concrete lintel
Ultra-lightweight: 0.111 to 0.148 Lightweight: 0.110 to 0.148 Dense: 0.110 to 0.150 CBA detail ref: E24-1-S-A Pitched roof over addition/steel lintel
Ultra-lightweight: 0.102 to 0.117 Lightweight: 0.099 to 0.118 Dense: 0.098 to 0.116 CBA detail ref: E24-2-C-A Pitched roof over bay/concrete lintel
Ultra-lightweight: 0.165 to 0.170 Lightweight: 0.167 to 0.171 Dense: 0.169 to 0.174 CBA detail ref: E24-2-S-A Pitched roof over bay/steel lintel
Ultra-lightweight: 0.189 to 0.219 Lightweight: 0.189 to 0.219 Dense: 0.189 to 0.219 CBA detail ref: E24-3-C-A Stepped apartment/concrete floor
Ultra-lightweight: 0.181 to 0.206 Lightweight: 0.181 to 0.206 Dense: 0.181 to 0.207 CBA detail ref: E24-3-T-A Stepped apartment/timber floor
SAP 2012 Table K1 ref: E25
Junction Detail: Staggered separating wall between dwellings*
SAP2012 Default ψ-value (W/mK): 0.12
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.097 to 0.138 Lightweight: 0.0103 to 0.152 Dense: 0.108 to 0.161 CBA detail ref: E25-338-A 338mm stagger
Ultra-lightweight: 0.093 to 0.145 Lightweight: 0.098 to 0.152 Dense: 0.099 to 0.156 CBA detail ref: E25-1038-A 1038mm stagger
SAP 2012 Table K1 ref: P8
Junction Detail: Exposed floor (inverted)*
SAP2012 Default ψ-value (W/mK): 0.24
Calculated CBA Full-fill ψ-value (W/mK):
Ultra-lightweight: 0.089 to 0.099 Lightweight: 0.163 to 0.177 Dense: 0.274 to 0.293 CBA detail ref: P8-C-A1 Concrete floor over garage
Ultra-lightweight: 0.196 to 0.210 Lightweight: 0.195 to 0.209 Dense: 0.1958 to 0.210 CBA detail ref: P8-C-A2 Concrete floor over drive-through
Ultra-lightweight: 0.139 to 0.198 Lightweight: 0.162 to 0.247 Dense: 0.180 to 0.291 CBA detail ref: P8-T-A1 Timber floor over garage
Ultra-lightweight: 0.171 to 0.263 Lightweight: 0.168 to 0.262 Dense: 0.168 to 0.260 CBA detail ref: P8-T-A2 Timber floor over-drive through
SAP 2012 Table K1 ref: P4
Junction Detail: Roof (insulation at ceiling level)*
SAP2012 Default ψ-value (W/mK): 0.24
Calculated CBA Full-fill ψ-value (W/mK): Lightweight: 0.181
Dense: 0.200
CBA detail ref: P4 FF CBA-306
SAP 2012 Table K1 ref: P5
Junction Detail: Roof (insulation at rafter level)*
SAP2012 Default ψ-value (W/mK): 0.04
Calculated CBA Full-fill ψ-value (W/mK): Lightweight: 0.035
Dense: 0.045
CBA detail ref: P5 FF CBA-307