What does climate zones have to do with the thickness/type of insulation I choose?

What does climate zones have to do with the thickness/type of insulation I choose?

In each climate zone, the Building Code of Australia has determined a minimum amount of needed insulation expressed in R-value (the efficiency of a material at stopping heat flow through it.)

This is the Building Code’s recommended amount of insulation, in R-values, for each climate zone and insulation type:

Climate Zone

1

2

3

4

5

6

7

8

Ceiling insulation for homes with very light coloured roofs

R4.1

R4.1

R4.1

R4.1

R4.1

R4.1

R4.1

R6.3

Ceiling insulation for homes with light coloured roofs

R4.6

R4.6

R4.6

R4.6

R4.6

R4.6

R4.6

R6.3

Ceiling insulation for homes with dark coloured roofs

R5.1

R5.1

R5.1

R5.1

R5.1

R5.1

R5.1

R6.3

Wall insulation

R2.8

R2.8

R2.8

R2.8

R2.8

R2.8

R2.8

R3.8

Underfloor insulation

R1.5

R1.0

R2.25

R1.0

R2.25

R2.25

R2.75

R3.25

R4.1 is about 20 cm thick (depending on the material and its density).
    • Related Articles

    • Does the colour or type of roof affect the thickness of insulation I should get?

      Yes, the darker the roof the higher the recommended minimum R-Value  Climate Zone 1 2 3 4 5 6 7 8 Ceiling insulation for homes with very light coloured roofs R4.1 R4.1 R4.1 R4.1 R4.1 R4.1 R4.1 R6.3 Ceiling insulation for homes with light coloured ...
    • Which type of insulation is the best and what is the difference between the types?

      When insulating your home, you can choose from many types of insulation. To choose the best type of insulation, you should first determine the following: • Where you want or need to install/add insulation • The recommended R-values for areas you want ...
    • What R-value and thickness insulation should I buy?

      Climate Zone 1 2 3 4 5 6 7 8 Ceiling insulation for homes with very light coloured roofs R4.1 R4.1 R4.1 R4.1 R4.1 R4.1 R4.1 R6.3 Ceiling insulation for homes with light coloured roofs R4.6 R4.6 R4.6 R4.6 R4.6 R4.6 R4.6 R6.3 Ceiling insulation for ...
    • What type/brand of insulation is best to buy?

      The benefits of each type of bulk insulation material are summarised below. Insulation material Low toxicity Environmentally friendly Soundproof Polyester ✓✓ ✓✓ ✓ Natural wool ✓✓✓ ✓✓✓ ✓ Glass wool ✓ ✓ ✓✓ Rockwool ✓ ✓ ✓✓ Cellulose fibre ✓✓ ✓✓ ✓ ...
    • What is the minimum amount/thickness of insulation I can get away with?

      In each climate zone, the Building Code of Australia has determined a minimum amount of needed insulation expressed in R-value (the efficiency of a material at stopping heat flow through it.) This should be the minimum you use. For the sake of your ...