ALF Tools

Insulation R-values

List of conservative R-values for selected insulation materials

It is preferable to use product specific R-values, where these are available. For insulation materials that have been BRANZ appraised, this information is available on the BRANZ website

Thickness (mm) Sheep Wool Polyester Cellulose (Macer. paper) Mineral/Glass Fibre Expanded Polystyrene
30 mm 0.5 0.5 0.5 0.6 0.7
40 mm 0.6 0.7 0.7 0.8 1.0
50 mm 0.8 0.8 0.9 1.0 1.2
60 mm 0.9 1.0 1.1 1.2 1.4
70 mm 1.1 1.2 1.3 1.3 1.7
75 mm 1.2 1.3 1.4 1.4 1.8
80 mm 1.2 1.3 1.5 1.5 1.9
90 mm 1.4 1.5 1.6 1.7 2.1
95 mm 1.5 1.6 1.7 1.8 2.3
100 mm 1.5 1.7 1.8 1.9 2.4
110 mm 1.7 1.8 2 2.1 2.6
120 mm 1.8 2 2.2 2.3 2.9
130 mm 2 2.2 2.4 2.5 3.1
140 mm 2.2 2.3 2.5 2.7 3.3
150 mm 2.4 2.5 2.7 2.9 3.6
200 mm 2.9 3.3 3.6 3.8 4.8
250 mm 3.6 4.2 4.5 4.8 6

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