Thermal conductivity values
Lambda 90/90 values (λ90/90) are the values adopted in the UK for Passivhaus calculations. These are thermal conductivity values that have been calculated according to the Lambda 90/90 convention (see box on page 96). This is normally signified by the CE mark.
The values given in the table below are not Lambda 90/90 values, as such figures can relate only to specific products rather than to generic materials. Some of the figures given here are approximate, while some vary according to the temperature and other properties of the material.
Conductivities for common building materials/elements
* In load-bearing strawbale buildings this acts as both a structural material and insulation.