Wet Room Installation

A wet room is a bathroom where the shower is not boxed off in its own tray or cubicle, but is simply part of the room, a level, fully tiled floor that falls gently to a drain, with the whole area waterproofed so water can go anywhere and do no harm. The look is clean and modern, the floor is level so there is nothing to step over, and it is far easier to clean. But the appeal rests entirely on one thing done right: the waterproofing underneath.

This page explains what a wet room actually is, what tanking means, where wet rooms suit, and how we build them to last across Auckland. When you are ready, Get a Free Quote.

What a wet room actually is

A wet room is a fully waterproofed bathroom with a level, open shower area that is part of the main floor rather than enclosed in a separate tray. There is no shower base, no step, and often only a single glass panel, or no screen at all, to keep spray off the rest of the room. The entire floor and the lower walls are tanked, meaning sealed with a continuous waterproof membrane, so the room can handle water across its whole surface.

The thing to understand is that a wet room is not a style choice bolted onto a normal bathroom. It is a waterproofing system first and a look second. Everything you can see, the level floor, the open shower, the single drain, is only possible because of the membrane you cannot see. Build it as a look without the system beneath it, and it leaks. Build the system properly, and it is one of the most reliable and durable bathrooms there is.

What 'tanking' means

Tanking is the trade term for fully waterproofing a wet area so it behaves like a shallow, sealed tank. In a wet room the whole floor and the lower walls are coated in a continuous waterproof membrane that is bonded to the substrate and sealed at every junction, corner, drain, and wall-to-floor join. Done correctly, tanking means that even if water finds its way through a grout line or a tiny crack in the tile, it meets the membrane and runs harmlessly to the drain rather than reaching the framing.

• The membrane is applied to a sound, correctly prepared substrate, never over a surface that could move or hold moisture
• Every penetration, the drain, any pipe, is sealed into the membrane, not just around it
• Internal corners and the wall-to-floor junction are reinforced, because that is where most failures start
• The whole system is installed to AS/NZS 3740, the New Zealand standard for internal wet-area waterproofing

Tiles sit on top of the membrane as the wearing and decorative surface, but they are not the waterproofing. In a wet room the membrane is everything.

Falls to the drain

Because a wet room has no tray to contain and channel water, the floor itself has to do that job. This is achieved with falls, deliberate, gentle slopes built into the floor so that every drop of water runs to the drain and nothing pools. Getting the falls right is the most skilled part of building a wet room:

• The whole showering area is graded toward the drain, with enough fall to drain quickly but not so much that the floor feels noticeably sloped underfoot
• Large-format tiles need careful planning so the fall can be achieved without the tile edges lipping up
• Linear channel drains are popular because they let the floor fall in a single direction, which works beautifully with large tiles
• The drain is sized and positioned so it clears water as fast as the shower delivers it

Water pooling on a wet room floor is the classic sign of falls done poorly. When the grading is right, the floor looks level to the eye but drains completely every time, which is exactly what you want.

The benefits of a wet room

Wet rooms have become popular in Auckland for good reasons that go beyond the modern look:

• Accessibility — a level, step-free entry suits anyone with limited mobility, is safer for older users, and future-proofs the home. This overlaps closely with our accessible bathroom work
• Easy cleaning — with no tray lip, no framed screen and fewer joins, there is far less for grime and mould to collect on, and the whole floor can simply be rinsed down
• A sense of space — removing the cubicle and running continuous tiling across the floor makes a small bathroom feel noticeably larger
• A modern, seamless look — the open, uninterrupted finish is clean and contemporary and does not date quickly
• Durability — a fully tanked floor is, when built correctly, one of the most robust waterproofing arrangements available

These benefits are real, but they all depend on the installation. A wet room is only as good as its tanking and its falls.

Where wet rooms suit, and where to think twice

A wet room is a great solution in many Auckland homes, but it is not automatically the right answer for every bathroom. It suits:

• Small bathrooms, where removing the cubicle genuinely frees up space
• Accessible and future-proofed bathrooms where a level entry matters
• Second bathrooms and ensuites where a clean, low-maintenance shower space is the priority

It is worth thinking carefully when:

• The floor is a suspended timber floor, which needs proper preparation and sometimes additional support to build reliable falls and a sound substrate
• You want to keep the rest of the room completely dry, in which case a well-placed glass panel is part of the design rather than an afterthought
• The only drainage run is difficult, which affects where the drain, and therefore the falls, can go

We assess the floor structure, the drainage and the layout before recommending a wet room, so you get one that performs rather than one that merely looks the part. Where a conventional tiled shower is the better call, we will say so, see our shower installation page.

How we build a wet room, and next steps

We build every wet room in the right order, because the sequence is what makes it last. The substrate is prepared and made sound, the falls are formed, the drain is set, the whole area is tanked to AS/NZS 3740 and allowed to cure, and only then is it tiled, grouted and sealed. Registered plumbers handle the drainage, and the waterproofing is done properly, never rushed, because a membrane failure in a level wet room affects the whole floor, not just a tray.

Because a wet room is a waterproofing-led build, it sits within the range of a standard bathroom renovation rather than being a cheap add-on, generally the $20,000 to $35,000 Auckland guide for a full bathroom, depending on size, layout and fixtures, with a compact wet room potentially lower. Every quote is fixed and written. To find out whether a wet room suits your bathroom, Get a Free Quote and we will assess your space honestly, or learn more about Bathroom Renovation Auckland.

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