
Plastic corner showers are a great way to keep your bathing area organised and efficient. Installation methods vary depending on the type of shelf, with built-in shelves being the strongest option as they are part of the shower's structure. To secure a plastic corner shower, it is important to start with a level surface to ensure proper drainage. This involves measuring the width and depth of the alcove and levelling the shower pan during installation. Proper sealing is crucial to avoid moisture problems and preserve the integrity of the unit. Silicone caulk can be applied to the gaps where the shower pan meets the drain and around the underside of the drain flange. Additionally, drilling pilot holes and securing the shower base with roofing nails provide stability.
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What You'll Learn

Use a level to check if the shower alcove is framed properly
When installing a direct-to-stud shower enclosure, it is crucial to ensure that your shower alcove is framed properly. This can be achieved by following these steps:
Firstly, use a level to check if the walls of your shower alcove are plumb and square in both corners. A level tool, such as a spirit level, will help you determine if the surface is horizontal or vertical, ensuring accuracy during installation. Place the level on each wall, adjusting as necessary until the bubble in the level indicates a straight, level surface.
Next, measure the width and depth of your alcove to confirm they align with the dimensions of the shower you plan to install. This step is crucial, as improper dimensions can lead to drainage issues. The shower alcove should be level, or you will encounter problems with the shower draining properly.
Additionally, before installing the shower base, address any low spots in the subfloor. Apply gypsum plaster or bricklayer's mortar to these areas to create a level surface. This step will make the process of levelling the shower base more manageable and provide added reinforcement.
After placing the shower base into the alcove, use a level to ascertain if it is even on all sides. If adjustments are needed, add shims to achieve a level position. This step is crucial, as an uneven shower base can lead to stability and drainage issues.
Finally, before proceeding with panel installation, ensure that any necessary rough plumbing is in place. This includes accommodating the plumbing and installation requirements, especially if you are working with masonry construction. While the studs do not need to be in perfect alignment with the provided diagram, they should be positioned where the surround walls and tub will be fastened to the alcove.
By diligently following these steps and using a level to check the framing of your shower alcove, you can ensure a proper installation that will provide stability and proper drainage for your plastic corner shower.
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Ensure the shower enclosure is sealed properly
To ensure that your shower enclosure is sealed properly, you must first prepare the walls and floor. Start by thoroughly cleaning the surface and applying a layer of primer. Once the primer is dry, use a brush or roller to apply a coat of liquid waterproofing membrane. This will ensure that water is kept away from your walls and floor.
The gap between the wall and the shower tray is the weakest point in a shower enclosure and must be sealed very well. Sanitary silicone is ideal for this purpose as it is resistant to oxidation and the damaging effects of fungi. Apply the silicone to plug the gaps and minimise the chances of water flooding your bathroom. Freshly applied silicone should be moistened with lukewarm water mixed with soap or washing-up liquid.
To maintain a tight seal, the shower enclosure should be kept immaculately clean. This will prevent the bathroom floor from becoming permanently wet, ugly stains from appearing, and mould from forming on the walls.
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Install a corner shower shelf
The ideal shower shelves are built into your shower. They are the strongest and most likely to match the rest of your bathing enclosure. However, if your shower doesn't have built-in shelves, you can install a corner shower shelf.
There are various types of corner shower shelves, each requiring its own installation method. This includes built-in, corner tension, glue-in, suction, and screw-in shelves.
Installing a glue-in corner shower shelf
If you opt for a glue-in corner shower shelf, follow these steps:
- Thoroughly clean off all soap scum and wait for the surface to dry.
- Apply a strip of foam tape on each mounting flange, stopping one inch short of the ends.
- Test-fit the shelf before removing the wax liner paper from the tape.
- Shim any gaps with additional layers of foam tape, adding extra layers to compensate for an out-of-square corner.
- Ensure all final adjustments are made before affixing, as once the foam tape touches the wall, it will be difficult to remove.
- Once the shelf fits squarely into the corner, apply silicone caulk.
Pros and cons of glue-in corner shower shelves
Glue-in corner shower shelves are one of the easiest and least expensive DIY shelves. However, they may not be the best option if you need something that can hold a lot of weight. According to Brandon Walker, Superintendent at ASAP Restoration, glue-in shelves can't hold much weight, and if the adhesive fails, the shelf can damage your shower when it falls. Additionally, they can pose a safety risk if you try to grab onto them in the event of a slip.
Other corner shower shelf options
If you're looking for something sturdier, built-in shelves are the strongest because they are part of the shower's structure. Screw-in shelves are another option that can hold around 20 pounds or more, depending on the quality of the setup and wall material. Suction or adhesive shelves, on the other hand, can only hold around 5 to 10 pounds.
When choosing a corner shower shelf, consider your specific needs and preferences. If you don't have construction or plumbing experience, it's recommended to consult a professional, especially if the wall needs structural reinforcement or if drilling is required, particularly near water pipes.
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Apply silicone caulk to the shower pan and drain
To apply silicone caulk to the shower pan and drain, you must first ensure that the shower is newly installed or that the existing caulk is peeling, cracking, mouldy, loose, or missing. If you are recaulking, remove the old caulk with a caulk or grout scraping tool and a utility knife. Protect your eyes and ears when removing old caulk with an electric multi-tool. Ensure the bathroom is well-ventilated if working with denatured alcohol or mineral spirits.
Before applying new caulk, check that the bathroom is between 40 and 80 degrees Fahrenheit. Apply painter's tape on either side of the seam, pressing down firmly to prevent the caulk from bleeding underneath. Place the tube of caulk into the caulking gun and cut off the nozzle end of the tube with scissors or a utility knife. Cut close to the end for a thin bead of caulk.
Slowly squeeze the caulking gun's trigger to extrude the bead of caulk into the seam, moving at a slow, consistent speed to ensure the caulk fully penetrates. Tool the caulk with your finger by wetting your finger in a cup of water, pressing down on the bead, and slowly running your finger along the bead to the end. Allow the caulk to dry for at least two to three days before using the shower.
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Drill pilot holes to secure the shower base
Drilling pilot holes is an important step in securing your plastic corner shower. It helps to create a stable framework for the entire structure. Here is a detailed guide on how to do it:
First, identify the locations where you want to drill the pilot holes. Mark these spots clearly with a marker or pencil. It is recommended to place masking tape over the marked areas to protect the surface of your shower base and prevent the drill from slipping.
Before you begin drilling, ensure you are wearing safety goggles to protect your eyes from any debris. Choose a drill bit that is appropriate for the material of your shower base. Start with a smaller drill bit to create the pilot hole, and then gradually increase the bit size until you reach the desired hole diameter. It is important to apply gentle pressure and start drilling at a slow speed to maintain control. Keep the drill perpendicular to the surface to ensure clean and accurate holes.
Once you have drilled the pilot holes, clean away any debris or excess material. Use a file or sandpaper to smooth out any rough edges, ensuring there are no sharp edges that could cause injury.
After creating the pilot holes, you can proceed with inserting fasteners or other components to secure the shower base. Make sure to follow the specific instructions provided by the manufacturer of your plastic corner shower.
It is important to note that drilling holes may weaken the shower base, especially if it is made of fragile material or has pre-existing damage. Always inspect your shower base thoroughly for any signs of flaws before drilling. If you have any concerns, consult with a professional to ensure that your shower remains stable and functional.
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Frequently asked questions
Built-in shelves are the strongest because they are part of the shower's structure. However, if your shower doesn't have built-in shelves, you can install a corner shower shelf after the fact.
First, thoroughly clean off all the soap scum and wait for the surface to dry. Then, apply a strip of foam tape on each mounting flange, stopping one inch short of the ends. Test-fit the shelf before removing the wax liner paper from the tape. Shim any gaps with additional layers of foam tape. Once the shelf fits squarely into the corner, apply the silicone caulk.
First, check that your shower alcove is framed properly and in good condition. Use a level to confirm that the walls are square in both corners and plumb all the way around. Measure the width and depth of your alcove and make sure the dimensions are correct for the shower you're putting in. Rough-in the drain line so that the opening of the drainpipe lines up with the drain on your shower base. Drill pilot holes in the flange and secure the shower base using roofing nails. Place the back shower wall against the studs and lower it onto the base. Cut holes for the plumbing and install the handle, shower arm, and showerhead according to the manufacturer's instructions.
Check your manufacturer's instructions to see what type of sealing is required for your unit. Some models have interlocking panels and built-in weep channels that will direct water, so no caulking is needed. For other types of enclosures, you may need to apply a caulk seal where the base and shower walls meet, as well as the seams between the walls.
A plastic wall splash guard helps keep water contained in your shower to protect floors and provides a secure bond to the surface of your shower walls. To install, simply apply the adhesive plastic wall splash guard to the surface of your shower walls.











































