What Is a Waterproofing Certificate and Do I Need One?

https://fun-wiki.win/index.php/Sarah%27s_DIY_Disaster_Story_Bathroom:_Plumbing_Mistakes_to_Avoid_in_Hobart_Renovations

Planning a bathroom renovation in Hobart? Before you start knocking down walls or picking out tapware, here’s where the rubber meets the road: the waterproofing certificate