St Lawrence Square
Supplementary Planning Document
Appendix 3d - A4 Report
February 2008
Letts Wheeler Architects
APPENDIX NO 1 – THERMAL PERFORMANCE CALCULATIONS
St Lawrence Rain Screen Cladding Wall (Timber)
Layer Description
Thickness
m
PLYWOOD (HEAVYWEIGHT)
Cavity
MINERAL FIBRE SLAB
Cavity
0.0150
0.0200
0.2000
0.0500
0.1000
0.0150
CONCRETE BLOCK (HEAVYWEIGHT)
PLASTER (DENSE)
Conductivity
W/(m·K)
Density
kg/m³
Capacity
J/(kg·K)
Resistance
m²K/W
0.150
700.0
1420.0
0.035
30.0
1000.0
1.630
0.500
2300.0
1300.0
1000.0
1000.0
0.1000
0.1800
5.7143
0.1800
0.0613
0.0300
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
0.061 m²K/W
0.123 m²K/W
11.540 W/m²·K
3.000 W/m²·K
4.771 W/m²·K
5.153 W/m²·K
0.1550 W/m²·K
0.1554 W/m²·K
5.6256 W/m²·K
1.26 Hrs
0.000 W/m²·K
0.298 m²K/W
8.000 Hrs
0.413
0.000
St Lawrence Square (Zinc Roof) Sheep’s Wool
Layer Description
Thickness
m
Conductivity
W/(m·K)
Density
kg/m³
Zinc
Plywood (LIGHTWEIGHT)
Cavity
Sheep’s Wool Insulation
Sheep’s Wool Insulation
Cavity
GYPSUM PLASTERBOARD
0.0025
0.0150
0.0250
0.1400
0.1000
0.0120
0.0150
118.000
0.150
7100.0
560.0
0.040
0.040
30.0
30.0
396.0
2500.0
0.1800
1000.0
1000.0
0.160
950.0
840.0
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
Capacity
J/(kg·K)
0.041 m²K/W
0.123 m²K/W
19.870 W/m²·K
3.000 W/m²·K
4.771 W/m²·K
5.153 W/m²·K
0.1489 W/m²·K
0.1494 W/m²·K
0.9975 W/m²·K
4.69 Hrs
0.000 W/m²·K
0.903 m²K/W
4.000 Hrs
0.966
0.000
Resistance
m²K/W
0.0000
0.1000
3.5000
2.5000
0.1800
0.0938
St Lawrence Square (Zinc Roof) Mineral Fibre
Layer Description
Resistance
Zinc Cladding
Plywood (LIGHTWEIGHT)
Cavity
MINERAL FIBRE SLAB
Cavity
GYPSUM PLASTERBOARD
Thickness
Conductivity
Density
Capacity
m
W/(m·K)
kg/m³
J/(kg·K)
m²K/W
0.0025
0.0150
0.0250
0.2000
0.0120
0.0150
118.000
0.150
7100.0
560.0
396.0
2500.0
0.035
30.0
1000.0
0.160
950.0
840.0
0.0000
0.1000
0.1800
5.7143
0.1800
0.0938
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
0.041 m²K/W
0.123 m²K/W
19.870 W/m²·K
3.000 W/m²·K
4.771 W/m²·K
5.153 W/m²·K
0.1555 W/m²·K
0.1561 W/m²·K
0.9772 W/m²·K
4.71 Hrs
0.000 W/m²·K
0.928 m²K/W
3.000 Hrs
0.967
0.000
St Lawrence Square Slate Roof
Layer Description
Resistance
Slate Tile
Cavity
Felt/Bitumen Layers
Plywood (LIGHTWEIGHT)
Cavity
MINERAL FIBRE SLAB
GYPSUM PLASTERBOARD
Thickness
Conductivity
Density
Capacity
M
W/(m·K)
kg/m³
J/(kg·K)
m²K/W
0.0120
0.0120
0.0050
0.0150
0.0120
0.2000
0.0150
2.000
2700.0
753.0
0.500
0.150
1700.0
560.0
1000.0
2500.0
0.035
0.160
30.0
950.0
1000.0
840.0
0.0060
0.1800
0.0100
0.1000
0.1800
5.7143
0.0938
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
0.041 m²K/W
0.123 m²K/W
19.870 W/m²·K
3.000 W/m²·K
4.771 W/m²·K
5.153 W/m²·K
0.1551 W/m²·K
0.1557 W/m²·K
0.9897 W/m²·K
4.70 Hrs
0.000 W/m²·K
0.815 m²K/W
5.000 Hrs
0.966
0.000
St Lawrence Square Ground Floor Construction
Layer Description
Resistance
LONDON CLAY
STONE CHIPPINGS
PHENOLIC FOAM
CAST CONCRETE
CHIPBOARD
SYNTHETIC CARPET
Thickness
Conductivity
Density
Capacity
M
0.7500
0.1000
0.1500
0.1000
0.0250
0.0100
W/(m·K)
1.410
0.960
0.034
1.130
0.150
0.060
kg/m³
1900.0
1800.0
30.0
2000.0
800.0
160.0
J/(kg·K)
1000.0
1000.0
1400.0
1000.0
2093.0
2500.0
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
m²K/W
0.5319
0.1042
4.4118
0.0885
0.1667
0.1667
0.040 m²K/W
0.117 m²K/W
19.870 W/m²·K
3.000 W/m²·K
5.130 W/m²·K
5.540 W/m²·K
0.1777 W/m²·K
0.1761 W/m²·K
2.2949 W/m²·K
0.89 Hrs
2.295 W/m²·K
0.001 m²K/W
9.000 Hrs
0.741
0.741
St Lawrence Green Roof
Layer Description
Resistance
Earth
Cavity
Knauf Polyboard
Cast concrete
Cavity
Gypsum Plasterboard
Thickness
Conductivity
Density
Capacity
m
W/(m·K)
kg/m³
J/(kg·K)
m²K/W
0.1500
0.0120
0.2500
0.1500
0.0120
0.0150
0.520
2050.0
1824.0
0.029
1.130
30.0
2000.0
1380.0
1000.0
0.160
950.0
840.0
0.2885
0.1800
8.6207
0.1327
0.1800
0.0938
Outside surface resistance
Inside surface resistance
Outside convective heat transfer coefficient
Inside convective heat transfer coefficient
Outside radiative heat transfer coefficient
Inside radiative heat transfer coefficient
CIBSE U-value
EN-ISO U-value
Admittance
Admittance time lead
Internal admittance
Decrement factor
Decrement factor time lag
Surface factor
Internal surface factor
0.041 m²K/W
0.123 m²K/W
19.870 W/m²·K
3.000 W/m²·K
4.771 W/m²·K
5.153 W/m²·K
0.1035 W/m²·K
0.1038 W/m²·K
2.3952 W/m²·K
0.97 Hrs
0.000 W/m²·K
0.011 m²K/W
10.000 Hrs
0.719
0.000