Hi @mg61,
Welcome to the Bunnings Workshop community, it is fantastic to have you with us.
The National Construction Code (NCC) and Australian Standard AS 3740:2021 govern waterproofing in wet areas, and in certain jurisdictions, it is a requirement that waterproofing work is carried out by a licensed water proofer.
Since your shower is open, it is considered an unenclosed shower, which often results in water spray reaching beyond the shower zone. In a setup like this, under section 10.2.18 of the National Construction Code (Part 10.2 Wet area waterproofing), it is recommended that the entire bathroom floor be waterproofed, or a vertical water stop be installed to contain the water. In your case, I would suggest checking the requirements of the hybrid flooring, as it is unlikely they will be usable in a direct wet area like a shower, so a water stop may need to be installed to delineate them from the tiled section.
While not always legally mandated, a waterproofing certificate is generally recommended when selling a home, especially if renovations have been done to wet areas. It provides proof of compliance with Australian Standards and can increase your property's value and buyer confidence. I would suggest you speak with your solicitor for their guidance on this.
Ultimately, there is a fair bit of complexity to this, so your best option is to speak with a licensed water proofer. They will be able to look at the area, assess the requirements based on the NCC and Australian Standards and make a recommendation. They will also be able to provide a waterproofing certificate.
Let me know what you think and if you have further questions, please don't hesitate to ask.
Jacob
