Marianne Martinez
Shower pans are typically made of acrylic, fiberglass, or composites and come in two types: those installed in a bed of mortar spread over the floor and those designed to rest flat on the floor without mortar. While some shower pans can be screwed down, some plumbers use a mortar bed even when the manufacturer does not specify that mortar is required. This is because a mortar bed provides more support for the shower pan, and a shower pan resting directly on the floor without a mortar bed may need to be more adequately supported. Spray foam can be used in place of a mortar bed to set a shower pan, but it is important to only use minimal-expanding foam to avoid creating pressure that can result in cracks.
| Characteristics | Values |
|---|---|
| Can you screw down a foam shower pan? | Yes, it is possible to screw down a foam shower pan. |
| Types of shower pans | Prefabricated shower pans come in two types: those installed in a bed of mortar and those that rest on the floor without mortar. |
| Materials used | Shower pans are typically made of acrylic, fiberglass, composites, or plastic. |
| Installation process | To install a shower pan, you need to prepare the floor, install the shower base, and assemble the compression shower drain. |
| Support | Shower pans require adequate support to prevent flexing and cracking. Support can be provided by a mortar bed, support ribs, or expanding foam. |
| Weight limits | Shower pans have weight limits that should not be exceeded to avoid structural failure. |
| Maintenance | Proper cleaning and maintenance of the shower pan are necessary to maintain its structural quality. |
| Flexing and movement | Shower pans may flex or move due to inadequate support or poor-quality materials. |
| Leaks | Severe flexing can cause leaks around the shower drain. |
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What You'll Learn
Shower pan installation methods
Shower pans are available in a variety of styles and sizes, and they can be made of acrylic, fiberglass, or composites. They can be installed in several ways, depending on the type of shower pan and the specific instructions provided by the manufacturer. Here is a step-by-step guide to installing a shower pan:
Step 1: Prepare the Subfloor
Before installing a shower pan, it is essential to ensure that the subfloor is flat and level. If the subfloor is uneven, you can use a self-levelling compound to create a flat surface. Follow the manufacturer's instructions for applying the self-levelling compound and allow it to cure completely.
Step 2: Test-Fit the Shower Pan
Dry-fit the shower pan in the installation location to ensure a proper fit. The shower pan should rest snugly against the wall studs. Use a level to check if the shower pan is level from front to back and left to right. Make any necessary adjustments to ensure the shower pan is level in all directions.
Step 3: Prepare the Drain
Disassemble the shower drain assembly and prepare the drain components. This may include sealing the drain flange with plumbers putty, silicone sealant, or a gasket, depending on the manufacturer's instructions. Place the flange through the top side of the shower pan and press down firmly without twisting to avoid damaging the shower pan.
Step 4: Secure the Shower Pan
Secure the shower pan to the subfloor using the appropriate fasteners. This may involve screwing the shower pan rim into the wall studs using exterior-grade screws through pre-drilled holes. Some shower pans may require the use of adhesives or mortar for a secure installation. Follow the manufacturer's instructions for the specific type of shower pan you are installing.
Step 5: Test for Leaks
Before proceeding with the rest of the installation, it is crucial to test the shower pan and drain connection for any leaks. Inspect the shower stall and the surrounding areas for any signs of water leakage. If leaks are detected, address them immediately and make the necessary corrections.
Additional Considerations:
- Waterproofing— While some prefabricated shower pans claim to be waterproof, it is often recommended to install a shower pan liner for added protection.
- Mortar Bed— Some shower pans require a bed of mortar to be spread over the floor before installation, providing additional support.
- Flexing Shower Pans— If your shower pan exhibits flexing or movement, it may be due to inadequate support. Consider reinstalling the pan in a mortar bed or using low-expansion spray foam for support.
By following these steps and considerations, you can effectively install a shower pan and create a functional and durable shower enclosure.
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The use of mortar with shower pans
Shower pans are the foundation of a stand-up shower, and it is imperative to ensure that they are installed correctly. While prefabricated shower pans come in two types—those installed in a bed of mortar and those that rest on the floor without mortar—the use of mortar with shower pans is essential to ensure the shower pan is adequately supported.
Mortar is a mix of standard cement and sand, which creates a water-resistant barrier that can support the weight of the shower unit. When installing a shower pan, it is necessary to ensure that the subfloor can support the weight of the project. Basic support can be provided by a wire mesh, a paper slip sheet, or a wood frame. The ideal mortar mix for a shower pan is a combination of standard cement mix, sand, and Portland cement. This mix provides a strong and mouldable barrier that effectively bonds to other surfaces.
To install a shower pan with mortar, it is recommended to mix the mortar slightly looser than normal to facilitate easier movement while maintaining its shape. Rather than creating a full bed of mortar, it is advisable to lay the mortar in strips with spaces in between, allowing the mortar to spread when the pan is set. This technique is similar to tiling, where a notched trowel is used to allow the mortar to move.
The use of mortar is particularly important for shower pans with thinner floors or less substantial support ribs, as it minimises or eliminates flexing. Poorly braced shower pans that rest directly on the subfloor without a mortar bed are more susceptible to flexing underfoot. By providing additional support, mortar helps prevent severe flexing, which can stress the drain fittings and cause leaks.
In summary, the use of mortar with shower pans is crucial to ensure a sturdy and water-resistant installation. By following the recommended mixing and application techniques, installers can effectively utilise mortar to provide the necessary support and stability for shower pans.
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The use of spray foam with shower pans
Spray foam is a useful tool for providing extra support to a shower pan. It is particularly effective when the shower pan has a thinner floor or less substantial support ribs, which can result in a base that is more susceptible to flexing.
Spray foam can be used in place of a mortar bed to set a shower pan. The use of spray foam under a shower pan can help to minimise or eliminate flexing. This is especially useful when the subfloor is uneven, as the built-in feet of the shower pan may not make good contact with the floor.
To use spray foam under a shower pan, first remove the shower base attached to the bathroom floor. Then, use a lever to lift the shower base and the tailpiece. Measure the shower pan and mark its position, ensuring that the shower base is level. If needed, use shims to level the side where the shower pan contacts the wall. Once the shower base is level, pre-drill to place the screws, then screw directly into the studs to secure the shower base permanently. Finally, add some weight to the shower pan so that it sets appropriately with the foam, being careful not to add too much weight.
It is important to note that only minimal-expanding foam should be used under a shower pan. This is because highly expanding foam can create pressure against opposing forces, resulting in cracks in the shower pan. Additionally, expanding foam will absorb water and could result in mould if there is a leak. Therefore, it is recommended to consult a contractor or refer to the manufacturer's instructions before using spray foam under a shower pan.
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The use of shims to level shower pans
While it is possible to use expanding foam to fill in the void under a shower base, some manuals and plumbers recommend using a mortar bed to support the shower pan. This is because the mortar bed provides a more solid foundation for the shower pan, reducing the chances of cracking and flexing.
However, if you are looking for a quicker alternative to a mortar bed, you can use shims to level your shower pan. Shimming can be done on the subfloor or the shower pan itself. Shimming the subfloor involves placing shims on the floor joists to create a level surface for the shower pan to rest on. This method provides full support for the pan and prevents cracking due to an uneven surface.
On the other hand, shimming the shower pan itself involves placing shims under the pan to level it. This method can be used if the subfloor is uneven, and the shower pan has support ribs. However, this method may result in uneven support for the ribs, with gaps in the centre. Additionally, wood shims are not recommended as they can rot and collapse over time. Plastic shims are a better alternative.
When using shims, it is important to tap the pan with a rubber mallet to make slight adjustments before setting the screws. It is also crucial to ensure that the shims are placed correctly and provide adequate support for the entire shower pan.
In conclusion, while shims can be used to level a shower pan, it is important to consider the potential disadvantages, such as uneven support and the need for additional support measures like a flexible drain fitting. Using a mortar bed, as recommended by some manufacturers, can provide a more solid foundation and reduce the chances of cracking and flexing over time.
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Fixing a moving shower pan
A shower pan is the foundation of your shower, designed with a slight slope to direct water towards the drain. Over time, it may need replacing due to significant movement, visible leakage, or large cracks.
If you are looking to fix a moving shower pan, the first step is to identify the cause of the movement. Once you know the cause, you may be able to make minor repairs to stabilise the pan or protect the delicate drain fittings.
If your shower base and drain fitting have been correctly installed, minor flexing will likely not be a problem. The flexing may be completely within the expected performance of the shower pan. However, if the shower pan is resting directly on the floor without a mortar bed, it may need to be more adequately supported along the length of the support ribs below it. This can be difficult to do after the pan is installed, and you may need to access the bottom of the shower pan from a room below the shower.
If you need to replace the shower pan, you will first need to remove the old one. This involves demolition work and careful handling of plumbing components. Start by turning off the water supply to the shower, then remove the shower drain cover using a screwdriver. Disconnect the drain pipe from the existing shower pan by loosening the fittings. If necessary, cut through the drainpipe connected to the old shower pan. Remove any tiles or other flooring materials that extend beyond the length of the new shower pan to fully expose the base. Use a hammer and cold chisel to chop out any tile.
Once the old pan is removed, you can install the new one. This requires precision to ensure a proper fit and drainage and to avoid future leaks and structural problems. Before placing the new pan, make sure the subfloor is adequately prepared and clean, removing any debris, old adhesive, or caulk remnants. Check the subfloor with a four-foot level to ensure it is even, and replace any damaged sections as necessary.
Finally, place the new shower pan on the floor and check its fit against the studs. Adjust the studs if needed for a snug fit. Mark the shower pan’s drain hole location on the subfloor and ensure it aligns with the existing plumbing. After confirming the fit, attach the strainer to the drain hole in the shower pan and set the shower pan into place.
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Frequently asked questions
Yes, you can. However, it is important to note that you should only use minimal-expanding foam to avoid creating pressure that could result in cracks.
First, remove the shower base and lift the tailpiece to ensure proper measurement. Next, apply low-expansion Styrofoam spray and use a drill machine to screw down the shower pan into the studs.
High-expansion foam can absorb water and lead to mould issues if there are leaks.
Yes, another common method is to use a mortar bed to support the shower pan. This is often recommended by manufacturers.
Over time, the foam may break down, creating voids and causing the pan to flex. It is important to follow the manufacturer's instructions and recommendations for the specific model of the shower pan.
