IMM wrote:

"Ian Stirling" wrote in message
...

Rick Dipper wrote:

I have worked out the U values of the insulation I intend to use in my
cavity walls, I have 2 solutions

1) Blocks -celotex-rockwall = 0.224 W/m2K
2) Blocks -2 * rockwall = 0.255 W/m2K


0.255 is poor. You should be aiming for 0.1ish


0.3 is adequate.

Imm is talking ********. Don't ingore the rest of the walls either. They
make a significant, but not dominating, contribution.