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Thanks freddymercurystwin I guess as long the outer dimensions stay the same and only the inner dimensions are reduced, that sounds sensible. cheers Russell

Hi My drawings were made and passed by Building Control pre 2010 Regs. So the walls are drawn as 75mm Cavity, and the Spec requires 75mm Crown Dritherm 34 insulation. The leaves are standard 100mm Red Facing Bricks and 100mm Celcon Solar blockwork. That was all over 3 years ago and my...