Building Regulations and Window Energy Ratings
4) Get your thermal conductivity values
IG manufacturers should have to hand the thermal conductivity values of the components that they use in the manufacture of their IG units.
Thermoseal Group can supply customers with thermal conductivity values for all spacer bar and sealant that the Group supplies. These thermal conductivity values can be compared to the values of the components used in registered WER simulations. These values will also be readily available to approved WER simulators.
Building Regulations and WERs Page 10