Trenches have moisture vapour barrier placed over the trench packing sand, then the trench mesh is added to the trenches. Penetrations are made in the vapour barrier to allow for plumbing services.

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In addition to the information I provide for designing and drafting your own house, I have another side project that tells you how long a house or land has been For Sale or Rent in Australia.
It is also Free to Use and also has a search to give you a price range indication of house and land for sale that doesn't have a listed price.
It is called Get House Date www.gethousedate.com.au Mobile Friendly too.