Getting your home ready before a waterproofer arrives can save time, reduce disruption and help deliver a better finish. Whether the job involves a bathroom, balcony, laundry, shower recess or another wet area, good preparation gives the tradie clear access to the surfaces that need sealing and helps them spot hidden issues early.
For Australian homes, waterproofing work also needs to comply with the National Construction Code and relevant state or territory licensing requirements. If your job involves plumbing, electrical work or any other restricted trade, those parts must be handled by a licensed professional. The better prepared the area is, the smoother the work will go.
Before The Waterproofer Arrives
Start by clearing the space completely. Waterproofers need to see the full floor area, wall junctions, shower bases, niches and any cracks, gaps or previous repairs. Remove towels, bath mats, toiletries, furniture, shelves and any loose fittings. If the room is being stripped back for a full membrane installation, take out anything that could get in the way of surface preparation.
If you are working on a bathroom or laundry, make sure the plumber has finished all rough-in work first. Any new pipes, wastes, mixers or floor wastes should be in place and tested before waterproofing begins. Once a membrane is installed, changing plumbing can damage the waterproofing and create leaks later.
Check that the subfloor and walls are dry and structurally sound. Waterproofer’s work is not a fix for rot, mould, loose tiles or movement in the framing. If you notice soft plasterboard, swollen skirting, cracked sheeting or signs of past leaks, raise it before the job starts. In some cases, materials such as Gyprock, fibre cement sheet from James Hardie, or other suitable wall linings may need replacement before waterproofing can proceed.
What To Remove Or Protect
Protect adjacent areas from dust, primer and membrane overspray or spills. In a lived-in home, that may mean covering nearby flooring and benchtops with drop sheets and moving valuables out of the room. If the access path runs through other rooms, clear a safe route so the tradie can carry materials in and out without damaging walls or finishes.
Some surfaces may need to be taken off before waterproofing begins:
- Loose or damaged tiles
- Old silicone, sealant and flaking paint
- Unstable grout or patchy previous repairs
- Vanities, shaving cabinets or removable trim
- Screen doors, mirrors or fittings that block access
If existing waterproofing is failing, do not simply coat over it and hope for the best. A waterproofer may need to strip back the surface, repair the substrate and apply a new membrane system. Follow the product manufacturer’s instructions, and use only suitable products recommended for the substrate and wet area type.
Prep Checks Your Tradie Will Appreciate
Good preparation also means making sure the area is easy to inspect. The waterproofer may want to check falls to waste, wall junctions, hob details, penetrations and movement joints. If these are hidden behind fixtures or clutter, it can slow the job down.
Here’s a simple checklist to run through beforehand:
- Confirm the room is empty and accessible
- Make sure power, water and ventilation are available if needed
- Arrange for any licensed plumber or electrician work to be completed first
- Clean off dust, soap scum, grease and loose debris
- Fix obvious leaks, drainage issues or structural defects
- Remove anything blocking corners, junctions and floor edges
Cleaning matters more than many homeowners expect. Membranes adhere best to sound, clean surfaces. In a bathroom or laundry, that usually means no soap residue, silicone residue, sanding dust, mould growth or flaky paint. Your waterproofer may do final surface prep, but starting with a clean area helps everything go faster.
Choosing The Right Conditions For The Job
Australian weather can affect waterproofing, especially in open-air spaces such as balconies, terraces and external laundries. Rain, high humidity and cold conditions can slow curing or interfere with the membrane finish. If the work is outdoors, check with the tradie about the best time to start and whether temporary protection from weather is needed.
For internal wet areas, make sure the room is well ventilated. Open windows if appropriate and keep exhaust fans working where they are already installed. Do not switch on fans, heaters or other equipment unless the tradie says it is safe to do so. If electricity has been disconnected for the job, leave that to the licensed electrician.
If your home is older, it may be worth asking the waterproofer whether any substrate upgrades are needed. In some cases, cement sheet, fibre cement board, masonry or other compliant linings may be a better base than tired plasterboard. The right substrate depends on the location, the membrane system and the requirements of the NCC.
Handy Prep Guide For Common Areas
| Area | What To Do Beforehand | Common Issues To Check |
|---|---|---|
| Bathroom | Remove fittings, clean surfaces, clear shower and vanity areas | Loose tiles, leaking waste, mould, damaged plasterboard |
| Laundry | Move appliances if needed, clear floor edges, expose walls and floor junctions | Drainage, cracked flooring, swelling from past leaks |
| Balcony | Clear furniture, plan for weather protection, expose edges and door thresholds | Ponding, cracked tiles, failed sealant, movement joints |
| Shower recess | Remove screens and accessories, ensure full access to corners and hob | Water damage, loose sheet lining, poor falls to waste |
Final Tips Before Work Starts
Have a quick chat with your waterproofer before the start day. Ask what they want removed, what they will supply and whether any extra preparation is needed from you. If a repair is required first, it may be handled by a tiler, carpenter, plumber or other licensed trade depending on the issue.
It also helps to keep pets and children away from the work area. Waterproofing products can have strong odours and need time to cure properly. Follow the tradie’s advice about drying times, access and when the area can be used again.
If your project is part of a renovation, coordinate the sequence carefully: demolition first, then any licensed plumbing or electrical work, then substrate repairs, then waterproofing, then tiling or finishes. That order helps avoid rework and protects the membrane.
Need ideas for other home improvement projects? You can also check out Trade Directory NZ.
When you’re ready to get the job moving, find a qualified local roofer on Aussie Trade Directory and connect with local roofers who can help protect your home from leaks and water damage.