Before You Start Your Renovation
Waterproofing is the most critical and least visible part of a bathroom renovation. Once tiles are laid, the membrane is hidden forever. Following this checklist ensures your Melbourne bathroom renovation is properly waterproofed from the start.
Renovation Waterproofing Checklist
1. Hire a VBA-registered waterproofer — verify their registration through the Victorian Building Authority. 2. Confirm AS 3740 compliance — your waterproofer should provide a written compliance certificate. 3. Follow the correct sequence — demolition, plumbing, substrate prep, waterproofing, flood test, then tiling. 4. Allow proper curing time — minimum 24 hours between membrane coats. 5. Insist on flood testing — 24-hour flood test with documented results. 6. Get written warranties — both workmanship (7–10 years) and product warranties.
Common Mistakes to Avoid
Skipping waterproofing to save cost, using cheap membranes, rushing curing times, damaging the membrane during construction, and not flood testing before tiling. These shortcuts can cost $10,000–$50,000+ in future repairs.
Renovation Waterproofing Budget
Budget $1,500–$4,500 for waterproofing as part of a standard bathroom renovation in Melbourne. This is a fraction of total renovation cost but the most critical investment.