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ENERGY EFFICIENCY
Spec J1.5 – 2.
Deemed-to-Satisfy Provisions
Figure 2 TYPICAL R-VALUES FOR WALL CONSTRUCTION— continued
(c)
(d)
External wall construction description Item Item description R-Value
Denseweight hollow concrete block with
internal plaster on battens or furring channels
125 mm solid reinforced concrete (dense
weight) – 10 mm internal plaster on battens or
furring channels
1. Outdoor air film (7 m/s) 0.03
2. Denseweight hollow
concrete block (See notes
3 and 4)
3. Airspace (20 mm to
40 mm non-reflective and
unventilated)
4. Plasterboard, gypsum
(10 mm, 880 kg/m 3 )
0.15
0.17
0.06
5. Indoor air film (still air) 0.12
Total R-Value 0.53
1. Outdoor air film (7 m/s) 0.03
2. 125 mm minimum solid
reinforced concrete (See
note 3)
3. Airspace (20 mm to
40 mm non-reflective and
unventilated)
4. Plasterboard, gypsum
(10 mm, 880 kg/m 3 )
0.09
0.17
0.06
5. Indoor air film (still air) 0.12
Total R-Value 0.47
(e)
Timber wall – external 6 mm cement sheet
cladding, 90 mm stud frame, 10 mm plaster
1. Outdoor air film (7 m/s) 0.03
2. Fibre cement (6 mm,
1360 kg/m 3 )
3. Airspace (90 mm
nonreflective and
unventilated)
4. Plasterboard, gypsum
(10 mm, 880 kg/m 3 )
0.03
0.17
0.06
5. Indoor air film (still air) 0.12
Total R-Value 0.41
BCA 2009 Volume One Australian Building Codes Board Page 436