Tillie Doyle
Installing a shower pan is a complex process with many steps, but it is a great way to ensure your shower is watertight. A typical shower construction model includes five layers to the shower floor: the subfloor, the slope base or first mortar bed, the shower pan liner, the final mortar bed, and shower tiling or floor. The shower pan liner is the most important aspect when it comes to waterproofing, so it is crucial to get this step right. This guide will take you through the process of installing a shower pan, from preparing the subfloor to testing for leaks, so you can achieve a successful installation.
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What You'll Learn
Ensure the subfloor is level
Ensuring that the subfloor is level is a crucial step in installing a shower pan. A level subfloor provides a stable and even surface for the shower pan to sit on, preventing future issues such as cracking or leaking. Here are the steps to ensure a level subfloor:
First, check if the subfloor area is level from left to right and from front to back. This can be done using a spirit level or a straightedge tool. Mark any uneven areas or high spots on the subfloor. If the subfloor is not completely flat and level, it needs to be levelled using one of the following methods:
If the unevenness is minor, you can use a self-levelling compound. Follow the manufacturer's instructions for this step, ensuring you use a compound that adheres to the substrate (OSB, cement board, plywood, etc.). Apply the self-levelling compound up to the reference line drawn on the subfloor. If necessary, screw a piece of 1x2 along the line to act as a dam and contain the compound within the shower pan area. Allow the compound to cure according to the manufacturer's instructions.
Alternatively, you can use shims to level the subfloor. This method involves placing shims (thin wedges of material) under the subfloor to create a flat and level surface. Ensure that the shims are secure and will not shift or move over time.
Once the subfloor is level, proceed with the shower pan installation, following the manufacturer's instructions and any relevant building codes. A level subfloor is essential to ensure the shower pan is stable and does not shift or crack over time.
It is important to note that some shower pan manufacturers may require a mortar bed or specify certain installation methods for their products. Always refer to the manufacturer's instructions and guidelines before beginning any installation work.
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Install the shower pan liner
Installing a shower pan liner is a complex task that requires advanced knowledge of construction and plumbing. It is a crucial step in the shower installation process, as it ensures the shower is waterproof and protects the porous shower wall framing and lower floor layers from water damage and mould. Here is a detailed guide on how to install a shower pan liner:
Prepare the Slope:
Firstly, you need to prepare the slope underneath the pan liner, which can be done using mortar or a product like Oatey's Perfect Slope. If using mortar, pour it onto the subfloor at a slope of ¼ inch per foot, sloping inward from the wall framing towards the drain base. Leave the mortar bed to cure according to the instructions. Alternatively, you can use Oatey's Perfect Slope, which is recommended for those without expertise in creating a perfectly sloped shower bed.
Measure and Cut the Pan Liner:
Once the slope has cured, measure and cut the pan liner to fit your shower. The liner should be large enough to completely cover the floor, turn up all sidewalls at least 2 inches above the finished curb height, and adequately cover the curb. If you have a bench, ensure the liner goes up and over the bench and then up the wall by about 6 inches.
Install the Pan Liner:
Before installing the pan liner, apply a bead of silicone caulk around the upper surface of the drain base to create a seal. Then, lay the pre-measured pan liner on the floor, ensuring it covers the drain body. For outside corners or curbs, use a dam corner to cover any cut areas, and bond them using the appropriate adhesive for your liner material.
Secure the Pan Liner:
Place the clamping ring over the bolts and lock it in place by turning it counterclockwise. Tighten the bolts to secure the pan liner. Ensure the weep holes are clear of any residual liner material or silicone.
Test for Waterproofing:
After securing the pan liner, perform a flood test to ensure your installation is watertight. Close off the drainpipe opening with a test plug and pour water into the shower bed to a height equal to the curb. Let the water sit for at least two hours. If there are no leaks, the water level will remain unchanged, and the surrounding area will be dry.
Complete the Installation:
Once you have confirmed the shower bed is watertight, you can move on to the final stages of your shower installation. This includes choosing your drain and drain height, applying a mortar base on top of the pan liner, applying thinset, selecting your tiling, and finally installing the tiles.
It is important to carefully follow the instructions and give yourself enough time to complete the project, as it may take longer than expected, especially for beginners.
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Prepare the slope
Preparing the slope is a crucial step in installing a shower pan. The slope ensures that water is directed towards the drain, preventing water accumulation and potential mould issues. Here are the steps to prepare the slope:
Choose Your Slope Material
You have two main options for creating the slope: mortar or a pre-made slope product like Oatey's Perfect Slope. Mortar is a traditional choice but requires more skill to create a perfect slope. Pre-made slope products offer a simpler alternative, saving time and hassle.
Prepare the Mortar Bed (if using mortar)
If you opt for mortar, start by pouring it onto the subfloor at a slope of 1/4 inch per foot, sloping inward from the wall framing towards the drain base. Do not let the mortar cover the drain base. Follow the manufacturer's instructions for curing the mortar bed. Ensure the mortar bed is dry and free of debris before proceeding to the next steps.
Install the Pre-made Slope (if using a product like Perfect Slope)
If you choose to use a pre-made slope product, trim it to fit your shower dimensions, including around the drain, for a flush fit. Follow the manufacturer's instructions for installation, which may include an application video and guidelines.
Check for Level
Regardless of your chosen slope material, it's important to check that your slope is level. Make a 5-inch mark up from the curb onto the wall framing. Take measurements from this mark down to the slope to determine the application height. This will help ensure your slope is installed correctly and at the appropriate angle.
Preparing the slope is a critical step in ensuring your shower pan functions properly and directs water towards the drain. Following these steps will help you create a well-prepared slope, whether you choose to use mortar or a pre-made slope product.
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Assemble the drain base
Installing a shower pan drain base requires careful preparation and precise execution to ensure proper drainage and prevent leaks. Here is a detailed guide on how to assemble the drain base for your shower pan:
Plan the Drainage Setup: Before beginning the installation, it is crucial to plan the drainage setup. Measure the shower stall framing and identify any alcoves or niches. Decide on the drain height based on the shower pan thickness and map out all the measurements. This ensures that the shower pan is sized, sloped, and situated correctly.
Prepare the Subfloor: Spread a layer of mortar on the subfloor, creating a slope towards the drain. Oatey's Perfect Slope can be used to save time and ensure an accurate slope. Alternatively, you can use a self-levelling compound and screw a piece of 1x2 along the line to contain it within the shower pan area. Allow the compound to cure according to the manufacturer's instructions.
Install the Drain Base: Place the drain base into a pre-made hole. The recommended hole size is 4.5 inches for Oatey tile shower drains. Screw the flange to the subfloor. If you have a pre-assembled drain, loosen the bolts connecting the clamping ring to the flange and remove the ring, keeping the drain plug in place.
Connect the Drain Assembly: Apply plastic pipe primer around the outside edge of the drainpipe and the inner surface of the lower drain body. Spread a thin layer of solvent glue on the same surfaces. Immediately insert the drain pipe into the socket on the drain body and hold it until the bond hardens. Let the glue and silicone caulk cure for 24 hours before using the shower.
Test the Fit: Test-fit the shower drain flange to ensure it sits flush with the shower base. Line the underside of the flange's rim with latex/acrylic or silicone caulk, following the manufacturer's instructions. Avoid using plumber's putty as it may degrade the shower pan material.
Secure the Flange: Place the flange through the top side of the shower pan and press down without twisting, allowing excess caulk to squeeze out. Screw the rubber drainpipe gasket over the drainpipe, followed by the gasket setscrew. Tighten it securely with the included tool and a screwdriver.
Install the Shower Drain Screen: Screw or snap the shower drain screen into place over the flange so that it sits flush with the shower pan base. Ensure that the thinset mortar or adhesive dries completely according to the manufacturer's instructions.
Test for Leaks: Before proceeding, test the pan and shower drain connection for leaks. Inspect the shower stall for any signs of water leakage. If leaks are detected, address them before continuing with the installation.
Remember to refer to the manufacturer's instructions and take the necessary safety precautions during the installation process.
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Check for leaks
Checking for leaks in your shower pan is essential for maintaining a healthy home environment and avoiding costly repairs. A leaky shower pan may not be immediately obvious, but if left undetected, it can cause significant damage to your home's structure and interiors. Here are some detailed, step-by-step instructions on how to check for leaks in your shower pan:
Step 1: Seal the Drain
Use waterproof duct tape, plastic sheeting, or a rubber plug to create a water-tight seal around the drain. This will ensure that any water you use for testing does not escape through the drain, providing an accurate indication of any leaks.
Step 2: Fill the Shower Pan with Water
Pour enough water into the shower pan to create about 2 inches (5 centimetres) of standing water. This depth is sufficient to conduct the leak test effectively.
Step 3: Mark the Water Level
Use a piece of tape, a permanent marker, or painter's tape to mark the water level. This marked level will serve as a reference point to identify any changes in the water level, indicating a potential leak.
Step 4: Wait and Observe
Leave the water in the shower pan for an extended period, typically around eight hours. After this duration, return to the shower and check the water level. If the water level has decreased, it strongly suggests a leak in the shower pan.
Step 5: Inspect for Water Damage
In addition to observing the water level, check the bathroom floor around the shower pan and the ceiling directly below the bathroom for any signs of water damage or staining. These visible indications can further confirm the presence of a leak.
Taking Action:
If you suspect a leak, it is essential to address it promptly. Before calling a professional, you can explore some DIY repairs to temporarily stop the leak. However, these are typically short-term fixes, and consulting a professional may be necessary for a permanent solution.
Remember, a leaking shower pan can lead to water damage, structural deterioration, and mould formation if not addressed promptly. Taking proactive measures to detect and repair leaks will help maintain the integrity of your shower and protect your home from extensive damage.
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Frequently asked questions
A shower pan is a ready-made floor for your shower, typically made of acrylic, fiberglass, or composites. It ensures that your shower is water-tight.
The entire bottom of the shower pan needs to sit on a flat, level surface. Check the subfloor area from left to right and from front to back to make sure it's level. If the subfloor is not flat and level, apply a self-leveling compound following the manufacturer's instructions.
First, dry-fit the shower pan in the opening and draw a reference line onto the subfloor along the edge of the shower pan. Drill 3/16-inch holes in the flange at each stud location and check if the shower drain hole lines up with the existing shower drain. Next, follow the manufacturer's instructions to apply a suitable sealant or adhesive, such as latex/acrylic or silicone caulk, to the underside of the shower drain flange's rim. Place the flange through the top side of the shower pan and press down firmly. Wipe away any excess caulk before it dries. Put the rubber washer and friction washer around the threads of the flange against the bottom of the shower pan, and then screw on the locking ring to tighten the gasket. Finally, allow the adhesive to dry fully and test the pan and shower drain connection for leaks.
