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US-European R Value Convertion Tables

A source of ingoing confusion is the difference between R values in the US and "SI" R values in Europe (and here in New Zealand).

As an example; an R 4.0 fiberglass Pink Batt in New Zealand would be labeled "R-23" in the USA. This is important to keep in mind when reading about insulation online.

Convert US R-values to European metric R values

US R valuesMetric R values
10.18
20.35
30.53
40.70
50.88
61.1
71.2
81.4
91.6
101.8
111.9
122.1
132.3
142.5
152.6
162.8
173.0
183.2
193.3
203.5
213.7
223.9
234.1
244.2
254.4
264.6
274.8
284.9
295.1
305.3

Convert European metric R values to US R-values

Metric R valuesUS R values
15.7
211
317
423
528
634
740
845
951
1057

To convert IP R-values to metric R-values, multiply by 0.1761. Source: http://en.wikibooks.org/wiki/Straw_Bale_Construction/Characteristics/Insulation

Also: http://www.allwallsystem.com/design/RValueTable.html (US R values)


Page last modified on 23 May 2011 at 01:52 PM