We are close to completing our building project (our first); a contemporary stone/oak clad timber frame, and have recently had the air tightness test carried out. We were hoping for a good result, somewhere under the 3.0 mark, but were amazed (as were the testing company) by the actual result of 0.296. Can anyone tell us how this ranks? What is the UK record for instance; and what will it mean from a practical point of view in terms of the energy efficiency of the house?
David & Jackie Oliver