
Installing a plastic shower tray is a challenging task that requires some plumbing knowledge and the right tools. It is important to ensure that the shower tray is installed correctly to avoid leaks and repairs, which can be costly and time-consuming. Before installing a plastic shower tray, it is crucial to take measurements and choose the right type of shower tray, such as an adjustable-height or low-profile tray, depending on factors like the floor type and waste position. The installation process involves placing the tray in the desired position, marking the outline, drilling fixing brackets, and adjusting the leg height to ensure the tray is level. After connecting the waste pipe and trap, sealing the shower tray with silicone sealant is essential to prevent leaks. With proper planning and execution, installing a plastic shower tray can be a rewarding DIY project that saves money and ensures a functional and aesthetically pleasing shower area.
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What You'll Learn

Choosing the right shower tray
Size and Shape
Shower trays come in various sizes and shapes, and choosing the right one is essential for a perfect fit in your shower enclosure. Common dimensions range from 760mm x 760mm to 1700mm x 700mm, but these can vary depending on the style and manufacturer. The largest trays can go up to 2000mm x 1000mm, and you can even find larger, custom-made trays. The shape you choose will depend on your bathroom space and the desired position of your shower. Popular shapes include square, rectangular, quadrant, and offset quadrant. For a unique aesthetic and maximised space efficiency, consider less common shapes like D-shaped or pentagon trays.
Height
Shower trays come in different heights, each offering unique benefits. Low-profile shower trays, or level-access trays, sit flush with the bathroom floor and offer a sleek, modern look. They are also an excellent choice for individuals with mobility challenges as they eliminate steps or gaps. However, proper drainage is crucial for low-profile trays to prevent water buildup. Adjustable-height shower trays are another option, providing easy access to the pipe underneath if repairs are needed.
Plug Hole Position
Consider the position of the plug hole and whether it is designed for left-hand or right-hand installation. This is an important factor in ensuring the correct alignment with the enclosure, maintaining watertightness, and preventing leaks.
Surface Treatment
Look for a shower tray with an anti-bacterial surface treatment to prevent the spread of bacteria and fungi, which is essential for maintaining hygiene. Additionally, check for compliance with regulations regarding volatile organic compounds (VOCs) to ensure the product is safe for your health and the environment.
Installation Surface
Shower trays can be installed on various floorings, including tiles, concrete, and wood. However, ensure that the surface is level and strong enough to support the weight of the tray and its usage over time. If needed, you can use a self-levelling compound to prepare the installation surface.
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Preparing the installation area
Firstly, decide on the type of shower tray you will be installing. You can choose between an adjustable-height shower tray and a low-profile shower tray. Adjustable-height shower trays are more popular as they provide easy access to the underlying pipework for maintenance or repairs. However, installing a low-profile shower tray is a more complex process and should only be attempted by experienced DIY enthusiasts.
Next, you need to prepare the installation area itself. Ensure that the area is clean and dry. Remove any old tiles, waste pipes, or flooring that may interfere with the new shower tray installation. It is important to note that shower trays should not be installed directly on a timber floor, as timber can expand and contract, causing the tray to move or crack over time. Consider using concrete or plywood as a base for the shower tray to prevent future movement issues. If your floor is concrete, clean and prime the surface before laying the concrete for the shower tray installation.
Before placing the shower tray, use a spirit level to check that the installation area is flat and strong enough to support the weight of the tray. This step is crucial to ensure proper drainage and prevent leaks. Place the shower tray loosely in the desired position and use a pencil to outline it. This will help you identify any potential fitment or clearance issues. If you are satisfied with the fit, you can proceed to the next steps of the installation process.
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Securing the legs
Before securing the legs, it is important to place the shower tray in the desired position and check if it is level using a spirit level. If the tray is not level, you will need to adjust the leg height accordingly. Mark the outline of the tray with a pencil and move it aside. This outline will serve as a reference for drilling the fixing brackets into the floor.
Now, you can start assembling the legs according to the shower tray's instructions. Fix the adhesive pads to the bottom of each leg assembly, ensuring that they are in the correct positions. Once all the legs are prepared, it's time to secure them to the tray. Follow the manufacturer's instructions for attaching the legs to the tray, as this may vary slightly depending on the model.
Using a good drill and suitable screws, secure the legs into position. Adjust the height of the legs to the desired level, ensuring that there is adequate clearance for the waste to fit properly. The legs should be set at 96mm from the shower tray, as per standard guidelines.
After securing the legs, you will need to attach the waste pipe. Place the shower tray waste component in position and check if everything lines up correctly. If you are satisfied with the fit, connect the waste to the tray and then to the trap. This step ensures that your shower tray will drain properly.
Finally, once the leg assemblies are fixed in place, clean the surface of any debris or residue. Check the level of the tray again with the spirit level to ensure it is completely stable and secure. Adjust the legs as needed to ensure the tray is level and firmly in place.
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Attaching the waste pipe
Before attaching the waste pipe, it's essential to place the shower tray in the desired position and check if it is level using a spirit level. If the tray is not level, adjust the leg height accordingly. Mark the outline of the tray and the waste hole position with a pencil. Ensure that there are no clearance issues and the waste pipe aligns with the waste hole.
Once you are satisfied with the positioning, the next step is to establish the route for the waste pipe. Plan the most suitable path for the waste pipe if it is not already in place. It is important to ensure that the waste pipe can be connected to the trap effectively.
Now, attach the waste pipe to the shower tray. This step requires careful handling to ensure a secure connection. Follow the manufacturer's instructions for attaching the waste pipe, as different shower tray brands may have specific guidelines.
After attaching the waste pipe, connect it to the trap. This step ensures that wastewater is directed properly. Again, refer to the manufacturer's instructions for connecting the waste pipe to the trap, as the process may vary depending on the shower tray model.
Finally, check that the waste pipe is secure and properly aligned. Use a spirit level to ensure the shower tray is completely level, as a wobbly shower tray can lead to drainage issues and leaks. A small adjustment to the leg height can be made at this point to ensure the tray is level.
By carefully following these steps, you can successfully attach the waste pipe to your plastic shower tray, ensuring a proper drainage system and avoiding potential leaks.
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$28 $30

Sealing the shower tray
Firstly, decide whether you are sealing the shower tray for the first time or resealing it. This distinction is important because it will determine the tray's position during the sealing process. If you are sealing the tray for the first time, it can be empty and unmounted, allowing you easy access to create optimal seals. On the other hand, resealing a shower tray occurs when the existing seals have failed, and the tray is already installed. In this case, you will need to thoroughly remove the old sealant and prepare the surface for new seals.
Next, select the appropriate sealant. It is recommended to use 100% silicone caulks designed for wet areas, as these provide maximum durability and mould resistance once cured.
Now, apply the silicone sealant to the edges of the shower tray. Ensure that you seal it completely from all sides to prevent any leakages between the shower tray and the wall. A thick line of silicone around the top of the tray, approximately 30mm up, is recommended. This line of silicone ensures that moisture does not get trapped behind the liner, and you won't need to apply silicone at the bottom of the tray.
After the silicone sealant has dried, you can finish the area by tiling or installing a shower panel. Always follow the manufacturer's instructions and observe any relevant building regulations during this process.
Remember, effective sealing maximises the longevity of your shower installation, preventing leaks and resisting mould growth. Regularly inspect and maintain the seals as part of your bathroom care routine to catch any small issues early on.
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Frequently asked questions
The installation site should be clean and dry. Remove any old tiles, waste pipes, or flooring. If the floor is timber, install concrete, thermal, or 12mm marine-ply boards before laying the concrete. If the floor is concrete, clean the area, prime the surface, and then lay the concrete.
Place the tray in the desired position and outline it with a pencil. Drill the fixing brackets into the floor and adjust the leg height. Install the shower tray waste and connect it to the trap. Apply silicone sealant to the edges of the tray to prevent leakages.
Ensure that the space is flat and strong enough to support the weight of the tray. Decide between an adjustable-height or low-profile shower tray, depending on factors such as floor type and waste position. Adjustable-height trays are more popular as they provide easy access to plumbing.











































