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What is the best insulation R-value to suit my home?

The following table gives the minimum insulation levels required by the BCA for a range of locations. Some experts believe that additional insulation can further improve building performance.

The table does not distinguish between directional R-values for roofs and ceilings. In high humid climates where houses are naturally ventilated, high down values and lower up values are appropriate for roofs and ceilings.

Minimum insulation level by climate — Cool temperate; Alpine
Reducing heat loss is the main priority
Example locations

Minimum insulation level (Total R-value)

Roof/Ceiling*

Wall

*These minimum insulation levels are higher if your roof has an upper surface absorbance value of more than 0.4.

Source: ABCB 2012

Melbourne, Vic 4.1 2.8
Canberra, ACT 4.1 2.8
Hobart, Tas 4.1 2.8
Mt Gambier, SA 4.1 2.8
Ballarat, Vic 4.1 2.8
Thredbo, NSW 6.3 3.8
Minimum insulation level by climate — Hot humid; Hot dry
Reducing heat gain is the top priority
Example locations

Minimum insulation level (Total R-value)

Roof/Ceiling*

Wall

*These minimum insulation levels are higher if your roof has an upper surface absorbance value of more than 0.4.

Source: ABCB 2012

Darwin, NT 4.1 2.8
Cairns, Qld 4.1 2.8
Broome, WA 4.1 2.8
Marble Bar, WA 4.1 2.8
Mt Isa, Qld 4.1 2.8
Tennant Creek, NT 4.1 2.8
Townsville, Qld 4.1 2.8
Minimum insulation level by climate — Warm temperate; Mild temperate; Warm humid
Reducing heat loss and heat gain are equally important
Example locations

Minimum insulation level (Total R-value)

Roof/Ceiling*

Wall

*These minimum insulation levels are higher if your roof has an upper surface absorbance value of more than 0.4.

Source: ABCB 2012

Brisbane, Qld 4.1 2.8
Perth, WA 4.1 2.8
Alice Springs, NT 4.1 2.8
Bourke, NSW 4.1 2.8
Sydney, NSW 4.1 2.8
Adelaide, SA 4.1 2.8
Katoomba, NSW 4.1 2.8

source www.yourhome.gov.au

 


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