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3.0 Energy Efficiency

Table 3.1 shows a number of different external wall configurations and identifies which satisfy the BCA requirement for Climate Zones 1 to 8. Table 3.2 lists the component R-Values used as a basis for Table 3.1. For more information on Hebel and energy efficiency refer to Section 3 and Appendix C and D of the Hebel Technical Manual.

Table 3.1:  BCA Energy Efficiency Compliance
Wall Configuration Satisfies BCA Requirements
Climate Zone: 1* 2* 3* 4 5 6 7 8
Class 1 & Class 10a Minimum R-Value: 1.4 1.4 1.4 2.2 1.9 2.2 2.4 3.3
1. 250mm Block Only Y Y Y N Y N N N
2. 250mm Block + 25mm Cavity Y Y Y Y Y Y N N
3. 250mm Block + 25mm Cavity + Sarking Y Y Y Y Y Y Y N
4. 250mm Block + 25mm Cavity + 75mm PowerPane Y Y Y Y Y Y Y N
5. 250mm Block + 40mm Cavity + R1.0 Insulation Y Y Y Y Y Y Y N
6. 250mm Block + 25mm Cavity + Double Sided RFL + 25mm Cavity Y Y Y Y Y Y Y Y
7. 250mm Block + 90mm Cavity + R2.0 Insulation Y Y Y Y Y Y Y Y

*Note: For elevated ground floor slabs an R-Value of 1.9 is required

Table 3.2:  Wall Element R-Value
System Number Construction Overall Thickness R-Value Rw Rw+Ctr
401 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 10mm Gyprock 268 mm 2.1 48 43
402 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres 10mm Gyprock 296mm 2.3 51 43
403 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres Non reflective (normal sarking) 10mm Gyprock 296mm 2.3 51 43
404 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres Reflective foil 10mm Gyprock 296mm 2.6 51 43
405 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres with 50mm 11kg – Bradford Glasswool Non reflective (sarking) 10mm Gyprock 296mm 3.1 53 44
406 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 8mm Render in Texture Coat and Paint 216mm 2.1 48 43

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