There are only minor changes to the energy efficiency provisions in the newly released BCA 2012, volumes 1 and 2. Mostly the changes are to terminology and explanatory information, intended to clarify several of the provisions. There has been one change to Table J1.3a in Section J which is of particular note; the required R-Value for roof and ceiling construction in climate zones 4 and 5 have been amended to align with climate zones 1, 2 and 3. See below for a full list of changes. BCA 2012 Volume 1 “” Section J: J0.2(a)(ii) – The reference to the 2006…