The walk-in shower has become a must-have for modern renovation and construction projects. Aesthetically pleasing, practical and accessible, it seduces with its sleek design and ease of access. But behind its apparent simplicity lies a technical installation that requires rigor, foresight and know-how. As professional plumbers specializing in bathroom renovations, we take a closer look at the key steps involved in successfully installing a walk-in shower.
Step 1: Prepare the soil
The Italian-style shower is characterized by its level shower tray, which means that the floor must be perfectly adapted to accommodate a built-in drainage system.
- Check the height available in the floor to accommodate the trap, drain and drainage system.
- In the case of renovation work, this may involve cutting out or partially raising the floor.
- The floor must be solid, stable and perfectly watertight.
Step 2: anticipate water evacuation
One of the most critical points is the drainage slope. Water must run off quickly, without stagnation, to avoid infiltration and moisture problems.
- The recommended minimum slope is 2 to 3 cm per metre.
- The diameter of the drain pipe must be sufficient (usually at least 50 mm).
- We strongly recommend the use of a high-flow siphonic bung, especially if you have a double-head shower.
Step 3: Choose the right shower tray or create a tiled floor
You have two options:
- An extra-flat, ready-to-tile or ready-to-install shower tray, often made of resin, to be embedded in the floor.
- A masonry shower floor, created on site with a screed, waterproofing mat and then non-slip tiles.
The second solution is more technical, but allows for a completely customized finish. Whichever option you choose, waterproofing is crucial.
Step 4: Ensure a perfect seal
Waterproofing is the key to a successful walk-in shower. Poorly controlled infiltration can quickly damage walls and floors, and cause serious damage.
- Apply a waterproofing membrane (mat, resin or liquid film) to the entire surface of the floor and the first few centimetres of the walls.
- Carefully treat corners and junctions with special sealing strips.
- Use waterproof grout and tile adhesive.
Step 5: Install and test the walls
Once the tiles or tray have been laid, install the shower enclosures (or opt for an open version if your configuration allows). Before use, test the drainage and general watertightness.
- Run water continuously for several minutes.
- Check for leaks around the bung, joints and at floor level.
- Check the slope and rapid water drainage.
Mistakes to avoid
- Insufficient slope: water stagnates and eventually infiltrates the joints.
- Slow drainage: often due to a low-flow plug or a pipe that’s too small.
- Neglected waterproofing: a major cause of infiltration and mold in the months that follow.
- Unsuitable materials: slippery tiles, non-waterproof glue, non-waterproof joints…
Why call in a professional plumber?
Although some of the steps may seem straightforward, installing a walk-in shower requires perfect mastery of plumbing, waterproofing and finishing. An experienced plumber:
- Guarantees long-lasting, compliant installation
- Creates precise slopes and flawless joints
- Advise you on the best materials and equipment
- Saves precious time on your jobsite
Conclusion: an aesthetic but demanding project
A walk-in shower is an elegant and practical choice, but its installation leaves no room for improvisation. Every stage – from floor to drain to waterproofing – must be carried out with precision. To avoid costly mistakes, it’s best to work with a qualified professional.
Thinking of installing a walk-in shower in your home? Visit our dedicated plumbing service to find out more, or contact our team here.
