Widely differing values have been given for the thermal performance of this product. The manufacturer
commissioned a report from TRADA Technology Ltd [1], which states "“...TRI-ISO SUPER 9 had insulating
properties equivalent to mineral wool (glass) of 200 mm. This provides thermal performance to the
equivalent of an overall thermal resistance (RT) of 5 m2K/W based on a recognised international thermal
conductivity value for standard glass wool insulation of 0.04 W/m·K." While this comparative test
contrasted two insulation systems it did not provide any actual U-values.
In 2004 Celotex Ltd commissioned NPL to undertake a hot-box test [2], which gave a measured thermal
resistance of 1.71 m2K/W, about one-third of that indicated by TRADA.
This paper reports on some in-situ U-value measurements that have been carried out on wall, floor and roof
constructions that contained TRI-ISO SUPER 9 as the principal insulation layer, ...
<snip several pages>
....
Conclusions
For these constructions incorporating a multi-foil insulation, the in-situ U-value measurements reported in
this paper are in good agreement with the NPL guarded hot-box measurements for the same product, and
are not consistent with a thermal resistance of 5.0 m2K/W.