Yes waterproofing essential

You don’t want water getting in our under floor. Look at the national construction code

Thank you ill have a look. The current hob built several decade ago doesnt have waterproofing so i wanted to check what the new codes said.

You have said in your opening post, “you have been told to waterproof hob”. So wouldn’t that be your answer, especially if the balcony is higher than lounge room now. Before the high hob would of protected lounge room from water entering. You have changed that, so would now need waterproofing.

There are no short cuts, you need to water proof any new work

Thanks everyone. Lots of delays and surprises with this reno. We hage delayed install ans are waterproofing all around the new frame.