Balconies, bathrooms, laundries, I think all need to be waterproofed.
Edit:
What I found:
- According to Australian Waterproofing Standards AS 3740, all shower floors must be waterproofed and all shower walls to be at least 1800mm should be waterproofed.
- All other walls such as the laundry wall must be waterproofed up to 150mm.
- If the bathroom floor is made of particle boards or wood or located on the second level, it is necessary for the whole bathroom floor to be waterproofed.
- If any step-downs to floors are about 100mm, it should be waterproofed as well.
Means my original statement above is incorrect if I interpret that correctly.
In saying that. Our single story, concrete slab house had all floors fully water-proofed as standard through a Project builder.