Clutch.
Sorry mate but you are clearly uneducated and ill informed about this.
Steel Houses DO NOT CREAK. This has been proven bu the CSIRO and was found to be no more than a myth perpetrated by the timber to protect market share.
Steel is recycleable. Timber is not. Of ALL the steel possible to be recycled in Australia, 80% is, and of that 80%, 95% is actually recycled and turned into new steel. We dig the iron ore up once, turn it into steel once, and then re-use if for the next 100,000 years.
Timber converts a lot of Cardon Di-Oxide to Oxygen during it's grow process, and then releases all that carbon back into the atmosphere as it degrades over the next 50 years. AVerage life span of a galvanised steel house frame..... 800 years. As proven in accelerated scientific tests.
To protect timber from Termites and/or Rot you need to treat it with harsh chemicals, how knows what they are doing to people..... Remember Asbestos?
RBPOWA, The blue coating on the "TrueCore" material is simply a blue ink/tint in the final Chromate layer. It's simply a branding exercise, and that steel (Bluescope's ZincAlume) is not actually 100% correct for use in Steel Framing, normal Z275 Gal is better, as you don't need to use a membrane underneath the steel on concrete slabs. Having said that though, in the vast majority of cases, it's no problem to do this.