The maximum U-value for walls has been 0.35 or less since 2002. Compare with 1.7 in 1965, 0.6 in 1985, and 0.45 in 1990. It's now 0.3.
I don't think you would achieve 0.45 with anything than wasn't a reasonable thickness - 30mm+ maybe but that's a guess.
How's the sealing? Have you bunged all the holes up? Windows?
It's normal to put insulation in the cavity btw. The 'normal' cavity has grown a bit, it used to be 2"/50mm but they now use 60mm at least. Kingspan make a 50mm board which gets brick and block under the building regs maximum.
E&OE, I'm not an expert, MD might have more useful comments.
Last edited by: Manatee on Tue 28 Jun 22 at 20:55
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Insulation question new
Insulation question new