Why you need waterproofing? According to the Victorian Building Authority (VBA). Wet areas must be waterproof or water-resistant. They also must comply with AS 3740. These include bathrooms, laundries, toilets, and showers. Walls, floors and wall-floor junctions must be waterproofed prior to tiling. Australian Standards AS 3740, waterproofers should provide a statement of compliance when finished. While stating their work complies with the Australian standard. We are licensed to complete waterproofing services.