How to Install a Shower Tray: Step-by-Step Guide to Cutting, Sealing & Cleaning

Installing a shower tray correctly is essential for creating a safe, watertight and long-lasting shower area. Whether you're renovating your bathroom or replacing an old shower tray, proper preparation, fitting and sealing can help prevent leaks and water damage.

In this guide, we'll explain how to install a shower tray step by step, including the tools you'll need, how to cut a shower tray to size, how to apply sealant and how to keep your shower tray clean.

Before starting, always check the manufacturer's installation instructions. Different shower tray materials and designs may require different installation methods, and some trays should only be installed by a qualified professional.

What Tools Do You Need to Install a Shower Tray?

Having the right tools ready before installation will make the job easier and help you achieve a professional finish.

Essential Tools

• Tape measure: For checking the shower tray dimensions and available space.

• Spirit level: To ensure the tray is correctly positioned and supported.

• Pencil or marker: For marking measurements and waste positions.

• Drill and screwdriver: For securing components where required.

• Sealant gun: For applying silicone neatly around the tray.

• Utility knife: For trimming sealing tape and suitable materials.

• Suitable cutting tools: Only required if your shower tray is designed to be cut.

• Safety equipment: Protective gloves, safety glasses and suitable respiratory protection when required.

Materials You May Need

Depending on your shower tray and installation method, you may also need:

• Shower tray waste and trap

• Sanitary silicone sealant

• Manufacturer-approved adhesive or mortar

• Shower tray sealing tape or waterproofing kit

• Waterproofing membrane

• Cleaning cloths and mild detergent

Always use materials recommended for your specific shower tray.

How to Install a Shower Tray Step by Step

The exact installation process depends on whether you're fitting a low-profile, stone resin, acrylic or raised shower tray. However, the following steps cover the main stages of a typical installation.

Step 1: Measure and Prepare the Installation Area

Before installing your shower tray, measure the available space carefully to make sure the tray fits correctly.

Check that the floor is clean, stable and capable of supporting the shower tray and its intended load. Remove any loose materials or debris that could affect installation.

You should also check the location of the shower waste and confirm that the drainage pipework can be connected correctly.

If you're replacing an existing shower tray, inspect the surrounding floor and walls for signs of water damage before fitting the new one.

Step 2: Position the Shower Tray and Check the Level

Place the shower tray in its intended position without permanently securing it.

Use a spirit level to check that the tray is positioned correctly according to the manufacturer's instructions. Most shower trays have a built-in slope that directs water towards the waste, so you generally shouldn't need to tilt the entire tray to create drainage.

Check that the tray sits securely and that the waste outlet lines up with the drainage connection.

Step 3: Install the Shower Waste

The shower waste allows water to drain away from the tray and into your bathroom's drainage system.

Before securing the tray, check that the waste and trap are compatible with the tray outlet.

Fit the waste components according to the manufacturer's instructions, ensuring that all supplied seals and washers are correctly positioned.

Connect the waste to the drainage pipework, maintaining the required fall for proper drainage.

Where possible, test the waste connection for leaks before the installation is fully enclosed.

Step 4: Secure the Shower Tray in Place

Once the tray is correctly positioned, it can be secured using the installation method specified by the manufacturer.

Some stone resin shower trays require a suitable mortar bed, while other trays may use an approved adhesive or adjustable leg system.

Apply the recommended bedding or fixing material as instructed, ensuring the tray is fully and evenly supported.

Avoid leaving unsupported areas beneath the tray, as movement during use can damage the tray or cause the surrounding seals to fail.

Allow any bedding material or adhesive to set for the recommended time before proceeding.

Step 5: Waterproof and Seal Around the Shower Tray

Proper waterproofing is one of the most important parts of shower tray installation.

Where required, install a compatible shower tray sealing kit or waterproofing tape at the junction between the tray and the walls.

This helps protect the area behind the shower tray from water penetration.

The surrounding wall waterproofing system should be correctly integrated with the tray seal before the final wall finish is installed.

Once the required finishes are complete, apply suitable sanitary silicone to the joints specified by the manufacturer.

We'll explain how to seal a shower tray in more detail below.

Step 6: Test the Shower Tray Installation

Before using your new shower, check that the tray is stable and that the waste drains correctly.

Inspect accessible waste connections for leaks and make sure water flows towards the outlet without unusual pooling.

Check the silicone joints for gaps or missed areas.

Allow all adhesives, waterproofing materials and silicone sealants to cure fully according to their instructions before using the shower.

How to Cut a Shower Tray to Size

Sometimes, a standard shower tray may not fit perfectly into your bathroom space. If you have an unusual layout, cutting a shower tray to size could be an option.

However, not all shower trays can be cut. Always check the manufacturer's instructions before making any modifications.

Watch the video below to see how a cut-to-size shower tray can be trimmed to fit your space.

Can All Shower Trays Be Cut?

No. Whether a shower tray can be cut depends on its material, construction and manufacturer's instructions.

Certain purpose-designed stone resin, solid-surface and tile-ready shower trays can be trimmed to fit specific spaces.

However, many standard acrylic and stone resin shower trays are not designed for cutting.

Even where cutting is permitted, there may be restrictions on how much material can be removed and which edges can be trimmed.

Always confirm that your shower tray is suitable for cutting before attempting any modifications.

What Tools Do You Need to Cut a Shower Tray?

The tools required will depend on the tray material and the manufacturer's recommended cutting method.

You may need:

• Tape measure

• Pencil or suitable marking tool

• Straight edge

• Manufacturer-approved saw or cutting tool

• Suitable supports or workbench

• Safety glasses and gloves

• Appropriate dust extraction and respiratory protection

Never assume that the same cutting tool is suitable for every type of shower tray.

How to Cut a Shower Tray Safely

If your shower tray is specifically designed to be cut, follow these general steps alongside the manufacturer's cutting instructions.

Step 1: Measure the Available Space

Measure the installation area carefully, taking account of wall finishes and any fitting tolerances required by the manufacturer.

Step 2: Mark the Cutting Line

Transfer your measurements onto the shower tray and mark the approved cutting area clearly.

Double-check your measurements before making any cuts.

Step 3: Support the Shower Tray

Position the tray on a stable, suitable work surface and support it according to the manufacturer's instructions.

Step 4: Cut Using the Recommended Method

Use only the cutting equipment and technique approved for your tray material. Follow all dust-control and safety requirements.

Step 5: Finish the Cut Edge

Where permitted, smooth and treat the exposed edge as directed by the manufacturer.

Some materials require additional edge sealing or finishing to maintain their water resistance.

Step 6: Check the Fit

Carefully test-fit the shower tray before permanently installing it.

If your tray isn't approved for cutting, choosing a different size or a purpose-designed cut-to-fit tray is the safer option.

How to Seal a Shower Tray Properly

Correctly sealing a shower tray helps prevent water from escaping into the surrounding floor and walls.

There are two important parts to consider: the waterproofing system behind the finished wall surface and the visible silicone seal around the tray.

What Sealant Should You Use for a Shower Tray?

A good-quality, mould-resistant sanitary silicone sealant is commonly used around shower trays.

Choose a product that is compatible with your shower tray material and surrounding surfaces.

Sanitary silicone is designed for wet areas and remains flexible to accommodate small amounts of movement.

However, silicone alone should not be relied upon as the complete waterproofing system for a shower installation.

How to Apply Silicone Sealant Around a Shower Tray

Step 1: Clean the Surface

Make sure the shower tray and adjoining surfaces are clean, dry and free from dust, grease and old sealant.

Step 2: Prepare the Joint

Ensure the joint is suitable for sealing. Where required, use a compatible backing material to achieve the correct sealant depth.

Step 3: Apply the Silicone

Using a sealant gun, apply a continuous, even bead of sanitary silicone along the joint between the shower tray and adjoining finished surfaces.

Step 4: Smooth the Sealant

Smooth the silicone using a suitable finishing tool, following the sealant manufacturer's instructions.

Avoid leaving gaps where water could enter.

Step 5: Allow the Silicone to Cure

Leave the sealant undisturbed for the full curing time specified on the product.

Do not use the shower until the silicone has fully cured.

How to Use Shower Tray Sealing Tape or a Sealing Kit

A shower tray sealing kit provides additional protection at the junction between the shower tray and the wall.

These systems typically use a flexible waterproof strip that bonds to the tray and connects with the wall waterproofing layer.

Depending on the system, installation may involve:

1. Cleaning and preparing the tray edge and adjoining wall.

2. Applying the supplied primer or adhesive where required.

3. Positioning the sealing strip along the tray-to-wall junction.

4. Pressing the strip firmly into place without wrinkles or gaps.

5. Integrating the strip with the compatible wall waterproofing system.

Shower tray sealing kits are generally installed before the final wall covering, so it's important to plan this stage before tiling or fitting wall panels.

Always follow the specific sealing kit instructions, particularly around corners and overlapping joints.

How Long Does Shower Tray Sealant Take to Dry?

The curing time depends on the silicone product, joint thickness, temperature and humidity.

Some sanitary silicones may be ready for water exposure after approximately 24 hours, while others require longer.

Always follow the curing time stated by the manufacturer rather than assuming the sealant is ready once it feels dry to the touch.

Common Shower Tray Installation Mistakes to Avoid

Even small installation mistakes can lead to drainage problems, leaks or damage over time.

Installing the tray on an uneven surface: An unstable base can cause movement, cracking or sealant failure.

Using the wrong adhesive or bedding material: Not every product is suitable for every shower tray. Always check the installation requirements.

Incorrectly fitting the shower waste: Poorly positioned washers, loose connections or inadequate drainage falls can cause leaks and blockages.

Cutting a shower tray that isn't designed to be cut: This can compromise the tray's strength and waterproofing.

Relying only on silicone for waterproofing: A proper shower waterproofing system is essential where required.

Using the shower too soon: Allow sufficient time for bedding materials, adhesives and sealants to cure before use.

Taking time to follow the manufacturer's instructions can help prevent expensive repairs later.

How to Clean and Maintain a Shower Tray

Regular cleaning helps keep your shower tray looking its best while reducing the build-up of soap scum, limescale and dirt.

Different shower tray materials may require different cleaning products, so always check the manufacturer's care instructions.

How to Clean a Shower Tray After Installation

Once the shower tray has been installed and all sealants have fully cured, remove any remaining dust and installation debris.

Use a soft cloth or non-abrasive sponge with warm water and a mild detergent to clean the surface.

Rinse thoroughly with clean water and dry using a soft cloth.

Avoid abrasive cleaning pads, harsh chemicals or scraping tools that could damage the finish.

How to Remove Stains from a Shower Tray

Soap residue, watermarks and limescale can gradually build up on shower trays, especially in areas with hard water.

For everyday marks, start with warm water and a mild, manufacturer-approved cleaning product.

Gently clean the affected area using a soft sponge, then rinse and dry thoroughly.

For stubborn stains, use a cleaning product specifically approved for your shower tray material.

Avoid strong acidic cleaners, abrasive powders and bleach unless the manufacturer confirms that they are safe for the surface.

How to Clean a Stone Resin Shower Tray

Stone resin shower trays are popular for their solid construction and stylish appearance, but they still require regular care.

For routine cleaning, use a soft cloth or sponge with warm water and a suitable mild detergent.

If your shower tray has a textured or slate-effect finish, gently clean the grooves to remove trapped soap residue.

Rinse thoroughly and dry the surface to help reduce watermarks.

Avoid abrasive brushes or aggressive cleaning products that could damage the surface coating.

How Often Should You Clean Your Shower Tray?

For everyday maintenance, rinse the tray after showering to remove soap and shampoo residue.

A more thorough clean once a week is a useful starting point, although the frequency will depend on how often the shower is used.

It's also worth checking the silicone seals regularly for mould, cracks or signs of deterioration.

Keeping the shower waste clear of hair and debris will help maintain proper drainage.

Frequently Asked Questions About Shower Tray Installation

Can You Install a Shower Tray Yourself?

Some shower trays can be installed by experienced DIY enthusiasts, provided the manufacturer's instructions are followed and the installation meets applicable requirements.

However, incorrect plumbing or waterproofing can lead to costly water damage. If you're unsure about any stage, it's best to consult a qualified professional.

Do You Need to Put Mortar Under a Shower Tray?

Some shower trays require a mortar bed to provide even support, while others are designed for installation using approved adhesives or adjustable legs.

The correct method depends on the tray design and manufacturer's instructions.

Can You Cut a Stone Resin Shower Tray?

Certain stone resin shower trays are designed to be cut, but many standard models are not.

Always check the product specifications and installation guide before attempting to cut a stone resin tray.

Should You Seal a Shower Tray Before Tiling?

Where a shower tray sealing kit is required, it is typically installed before tiling so that it can be integrated with the wall waterproofing system.

The final visible silicone seal is normally applied at the appropriate finishing stage, following the tray and wall system instructions.

What Is the Best Silicone for a Shower Tray?

A high-quality, mould-resistant sanitary silicone that is compatible with the shower tray and surrounding materials is generally a suitable choice.

Always follow the manufacturer's recommendations.

How Long Does It Take to Install a Shower Tray?

Installation time varies depending on the type of shower tray, floor condition, waste positioning and waterproofing requirements.

Although the physical fitting may take several hours, the full process can take longer because adhesives, bedding materials and sealants need time to cure.