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ENERGY EFFICIENCY
Spec J1.6 – 2.
Deemed-to-Satisfy Provisions
Figure 2 TYPICAL R-VALUES FOR FLOOR CONSTRUCTION (for a floor without a floor heating system)— continued
Floor construction description Item Item description R-Value
(c) Solid concrete suspended slab,
ground floor
Up
Down
1. Indoor air film (still air) 0.11 0.16
2. Solid concrete (150 mm,
2400 kg/m 3 )
0.10 0.10
3. Outdoor air film (7 m/s) 0.03 0.03
Total R-Value 0.24 0.29
(d) 150 mm hollow-core concrete planks,
ground floor
1. Indoor air film (still air) 0.11 0.16
2. Concrete topping (60 mm,
2,400 kg/m 3 )
3. Hollow-core concrete planks
(150 mm, 1,680 kg/m 3 , 30%
cores)
0.04 0.04
0.14 0.14
4. Outdoor air film (7 m/s) 0.03 0.03
Total R-Value 0.32 0.37
Notes:
1. The R-Value of an item, other than an air space, air film or air cavity, may be increased in
proportion to the increased thickness of the item.
2. The Total R-Value of a form of construction may be increased by the amount that an individual item
is increased.
3. For floor types (c) and (d) that are located over an internal space, the Total R-Value can be
calculated by replacing the value for outdoor air film (R0.03) on the underside of the floor with the
value for indoor air film (R0.11).
4. The addition of 10 mm of render to the ceiling of a suspended internal concrete floor will increase
the Total R-Value by 0.02.
5. Solid concrete slab includes concrete beam and infill floors and concrete precast permanent
formwork panels.
6. Where an airspace is filled, the R-Value listed for the airspace must be deducted from the Total
R-Value of the floor construction.
BCA 2009 Volume One Australian Building Codes Board Page 440