Hi, We renovated our above before moving to a strata block and added insulation to the newer section; we were strongly advised by the architects and builder to double insulate. That was before the big dry El Nino’s that have been around recent times. Think it was a very worthwhile investment. It’s really a matter of if your neighbours are on side with you in getting this done, how much disposable income in the maintenance kitty etc, and any other major works needed doing. Don’t know that it’s anything other than an independent renovating project. Others may know more, and advise if it is part of strataland guidelines. Best of luck!