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Exposed and semi-exposed upper floors
Table E12 to Part J Appendix E: Exposed and semi-exposed upper floors of timber construction
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Design U-value |
Thermal conductivity of insulant (W/mK) |
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0.02 |
0.025 |
0.03 |
0.035 |
0.04 |
0.045 |
0.05 |
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Base thickness of insulation between joists to achieve design U-values |
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A |
B |
C |
D |
E |
F |
G |
H |
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Exposed floor |
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1 |
0.35 |
61 |
76 |
92 |
107 |
122 |
146 |
162 |
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2 |
0.45 |
42 |
53 |
63 |
74 |
84 |
95 |
106 |
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Semi-exposed floor |
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3 |
0.60 |
25 |
32 |
38 |
44 |
50 |
57 |
63 |
Note:
Table E12 is derived for floors with the proportion of timber at 12%, which corresponds to 48 mm wide timbers at 400 mm centres. For other proportions of timber the U-value can be calculated using the procedure in Appendix A.
Table E13 to Part J Appendix E: Exposed and semi-exposed upper floors of concrete construction
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Design U-value |
Thermal conductivity of insulant (W/mK) |
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0.02 |
0.025 |
0.03 |
0.035 |
0.04 |
0.045 |
0.05 |
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Base thickness of insulation to achieve design U-values |
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A |
B |
C |
D |
E |
F |
G |
H |
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Exposed floor |
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1 |
0.35 |
52 |
65 |
78 |
91 |
104 |
117 |
130 |
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2 |
0.45 |
39 |
49 |
59 |
69 |
79 |
89 |
98 |
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Semi-exposed floor |
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3 |
0.60 |
26 |
33 |
39 |
46 |
52 |
59 |
65 |
Table E14 to Part J Appendix E: Exposed and semi-exposed upper floors: allowable reduction in base thickness for common components
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Design Component |
Thermal conductivity of insulant (W/mK) |
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0.02 |
0.025 |
0.03 |
0.035 |
0.04 |
0.045 |
0.05 |
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Reduction in base thickness of insulating material (mm) |
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A |
B |
C |
D |
E |
F |
G |
H |
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1 |
10 mm plasterboard |
1 |
2 |
2 |
2 |
3 |
3 |
3 |
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2 |
19 mm timber flooring |
3 |
3 |
4 |
5 |
5 |
6 |
7 |
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3 |
50 mm screed |
2 |
3 |
4 |
4 |
5 |
5 |
6 |
Table E15 to Part J Appendix E: Thermal conductivity of some common construction materials
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Material |
Density (kg/m3) |
Thermal Conductivity |
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Walls (external and internal) |
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Brickwork (outer leaf) |
1700 |
0.84 |
|
Brickwork (inner leaf) |
1700 |
0.62 |
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Cast concrete (dense) |
2100 |
1.40 |
|
Cast concrete (lightweight) |
1200 |
0.38 |
|
Concrete block (heavyweight) |
2300 |
1.63 |
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Concrete block (medium weight) |
1400 |
0.51 |
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Concrete block (lightweight) |
600 |
0.19 |
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Normal mortar |
1750 |
0.80 |
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Fibreboard |
300 |
0.06 |
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Plasterboard |
950 |
0.16 |
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Tile hanging |
1900 |
0.84 |
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Timber |
650 |
0.14 |
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Surface finishes |
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External rendering |
1300 |
0.50 |
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Plaster (dense) |
1300 |
0 50 |
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Plaster (lightweight) |
600 |
0.16 |
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Calcium Silicate board |
875 |
0.17 |
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Roofs |
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Aerated concrete slab |
500 |
0.16 |
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Asphalt |
1700 |
0.50 |
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Felt/bitumen layers |
1700 |
0.50 |
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Screed |
1200 |
0.41 |
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Stone chippings |
1800 |
0.96 |
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Tile |
1900 |
0.84 |
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Wood wool slab |
500 |
0.10 |
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Floors |
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Cast concrete |
2000 |
1.13 |
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Metal tray |
7800 |
50.00 |
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Screed |
1200 |
0.41 |
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Timber flooring |
650 |
0.14 |
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Wood blocks |
650 |
0.14 |
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Insulation |
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Expanded polystyrene (EPS) slab |
25 |
0.035 |
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Mineral wool quilt |
12 |
0.040 |
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Mineral wool slab |
25 |
0.035 |
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Phenolic foam board |
30 |
0.020 |
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Polyurethane board |
30 |
0.025 |
Note:
If available, test values certified by an independent test house should be used in preference to those in the table.
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