"Mike" wrote in message
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"NickFinnigan" wrote in message
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I have just seen some 25mm quitled roof insulation, that says it
acheives 0.2 U value, its about the same price as 100mm kingspan,
which is also about the same U value.

It has been independantly tested.

Do you have a reference to this please ?

Martin Evans pointed to a Celotex pdf that refers to 2 tests.