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ENERGY EFFICIENCY
Spec J1.5 – 2.
Deemed-to-Satisfy Provisions
Figure 2 TYPICAL R-VALUES FOR WALL CONSTRUCTION— continued
External wall construction description Item Item description R-Value
Notes:
1. The R-Value of an item, other than an airspace, 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. The addition of 10 mm of render to a concrete or masonry wall will increase the Total R-Value by
0.02.
4. (a) The typical R-Value in Figure 2(a) and (b) is for 90 mm denseweight concrete block.
(b) The typical R-Value in Figure 2(c) and (h) is for 140 mm denseweight hollow concrete
block.
(c) The typical R-Value in Figure 2(d) is for 125 mm solid reinforced concrete (2400 kg/m 3 ).
(d) Other typical R-Values for masonry and concrete are as follows and may be substituted
for those above:
90 mm clay brick:
(density 1430 kg/m 3 ) 0.16
(density 1690 kg/m 3 ) 0.14
(density 1950 kg/m 3 ) 0.12
110 mm clay brick:
(density 1430 kg/m 3 , 2.75 kg/brick) 0.20
(density 1690 kg/m 3 , 3.25 kg/brick) 0.17
(density 1950 kg/m 3 , 3.75 kg/brick) 0.14
Denseweight hollow concrete block:
110 mm 0.12
190 mm 0.20
5. The Total R-Values in this Figure are for external walls. The Total R-Value for an internal wall of
the same construction would be 0.09 greater because the R-Value for an outdoor air film would be
replaced by that of an indoor air film.
6. Where a cavity or airspace is filled, the R-Value listed for the cavity must be deducted from the
Total R-Value of the wall.
BCA 2009 Volume One Australian Building Codes Board Page 438