Ella Walter
Installing a T-pan, or a drain pan, can be a tricky process. The type of T-pan you install will depend on the appliance you are installing it under. For example, the process of installing a shower pan is different from installing a drain pan under a water heater or a washing machine. In general, the process involves waterproofing, levelling, and sealing the T-pan to prevent leaks. For a shower pan, this involves installing a shower pan liner, creating a slope, and applying mortar and tiling. For a water heater or washing machine, you may need to drain the appliance and lift it to insert the pan underneath.
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What You'll Learn
Ensure the subfloor is level
To ensure that the subfloor is level, you must first check the subfloor area from left to right and from front to back to make sure it is level. If the subfloor is not level, apply a self-leveling compound, adhering to the manufacturer's instructions. You must also ensure that the self-leveling compound is compatible with the substrate you are installing it over (OSB, cement board, plywood, etc.).
Run the self-leveling compound up to the line you drew in the first step. If necessary, screw a piece of 1x2 along the line to act as a dam to contain the self-leveling compound within the shower pan area. Allow the self-leveling compound to cure according to the manufacturer's instructions.
After the subfloor is level, you can proceed with the next steps of the shower installation. The shower pan liner is the most important aspect when it comes to waterproofing, as it protects the porous shower wall framing and lower floor layers from water permeation and mould outbreaks.
After levelling the subfloor, you can prepare the slope. You have two options: mortar or a pre-made slope product. If you choose to use mortar, pour it onto the subfloor at 1/4 inch per foot, sloping inward from the wall framing to the top of (but not over) the drain base. After this, leave the mortar bed to cure according to the mortar instructions.
If you want to save time and effort, you can install a pre-made slope product, ensuring that you trim it to your shower dimensions and around the drain for a flush fit.
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$38.99
Install the shower pan liner
Installing a shower pan liner is a complex process, but it is a crucial aspect of waterproofing your shower. Here is a detailed, step-by-step guide on how to install a shower pan liner:
First, prepare the slope. You have two options: use mortar or a pre-made product like Oatey's Perfect Slope. For the mortar option, pour mortar onto the subfloor at a slope of ¼ inch per foot, sloping inward from the wall framing to the top of the drain base. Leave the mortar bed to cure according to the manufacturer's instructions. Alternatively, if you choose a pre-made product, install it onto the subfloor, trimming it to fit your shower dimensions and around the drain.
Next, measure and cut the pan liner to fit your shower. The liner should run at least 6 inches up the wall, and it is important to ensure there are no screw holes below that mark. After measuring and cutting, install the pan liner, folding the corners and securing it to the rough framing.
Then, adhere the pan liner to the curb and install the dam corners. It is recommended to avoid using felt paper with the pan liner as the petroleum in the felt paper can react with the liner, causing it to crack and become brittle, leading to leaks.
Finally, perform a flood test to ensure your shower bed is watertight. Leave the adhesives to cure overnight, then secure 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 the same, the surrounding area will be dry, and there will be no water leaking from the ceiling (if on an upper floor).
Once the flood test is successful, you can move on to the next stages of your shower installation, including choosing your drain and drain height, applying a mortar base on top of the pan liner, and tiling.
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Prepare the slope
Preparing the slope is an important step in installing a shower pan. It involves creating a slope or gradient on the subfloor that will allow water to drain effectively and prevent water accumulation and potential leakage. Here is a step-by-step guide to preparing the slope:
Firstly, ensure that your subfloor is level. Check the subfloor area from left to right and from front to back to confirm it is level. If the subfloor is not level, you will need to apply a self-leveling compound following the manufacturer's instructions. Make sure to use a compound that is compatible with your substrate material (e.g., OSB, cement board, plywood). Apply the compound up to the reference line drawn on the subfloor in a previous step. If necessary, screw a piece of 1x2 along the line to act as a dam to contain the self-leveling compound within the shower pan area. Allow the compound to cure according to the manufacturer's instructions.
Once the subfloor is level, you can create the slope. You have two main options: using mortar or using a pre-made slope product like Oatey's Perfect Slope. If you choose to use mortar, pour it onto the subfloor, creating a 1/4-inch per foot slope that inclines inward from the wall framing towards the drain base. Do not let the mortar cover the drain base. Allow the mortar bed to cure according to the manufacturer's instructions. Alternatively, if you prefer a quicker and easier option, you can use Oatey's Perfect Slope. Install it onto the subfloor, trimming it to fit your shower dimensions and ensuring a flush fit around the drain.
After preparing the slope, you will need to install a waterproof membrane liner, such as a shower pan liner, to protect the shower wall framing and lower floor layers from water damage and mould. This liner will be sandwiched between two flanges and bolted in place. You can then proceed to the next steps of your shower pan installation, such as installing the drain assembly and completing the tile installation.
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Seal the drain pipe
Sealing the drain pipe is an important step in the installation of a t pan. Here is a step-by-step guide to help you seal the drain pipe effectively:
Step 1: Mark and Drill
Mark the location of the drain pipe on the t pan and drill a hole. It is important to do this step carefully and accurately. Place a sacrifice piece of wood or similar material underneath while drilling to provide support and prevent the plastic from fracturing.
Step 2: Cut the Pipe (Optional)
If needed, cut the drain pipe to the desired height. This step may be necessary if the pipe is too long and will interfere with the placement of the t pan. Ensure that you only cut the pipe to the required height, typically about 1/2" higher than the pan.
Step 3: Seal the Interface
Apply a generous amount of high-quality silicone caulk or sealant around the interface between the drain pipe and the t pan. Ensure that you use the correct type of caulk or sealant that is suitable for the materials of the pipe and pan. This step is crucial to creating a watertight seal and preventing leaks.
Step 4: Allow to Cure
Follow the manufacturer's instructions for the caulk or sealant you have used, and allow the sealant to cure fully. This step is important to ensure that the seal is strong and durable.
Step 5: Test for Leaks (Optional)
Once the sealant has cured, you may optionally test the seal by pouring water over the t pan and observing if any leaks occur. This step will help ensure that your installation is secure and watertight.
By following these steps, you can effectively seal the drain pipe when installing a t pan, ensuring a watertight connection that prevents leaks.
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Test for leaks
After installing a new shower pan, it is important to test for leaks. Let the thinset mortar or adhesive dry fully according to the manufacturer's instructions.
To test for leaks, pour water over the shower pan. Let the water sit for at least two hours. If there are no leaks, the water level will remain the same, the surrounding area will be dry, and there will be no water leaking from the ceiling (if on an upper floor).
Another way to test for leaks is to fill the shower bed with water to a height equal to that of the curb. After at least two hours, if the water level hasn't dropped, there are no leaks.
If you are installing a drain pan under an existing water heater, it is recommended to drain the water heater completely before sliding the pan underneath. Once the pan is in place, you can fill the water heater back up and check for any leaks around the connections.
If you are installing a washing machine drain pan, you will need to drill a hole in the pan for the drain pipe. Use the most expensive silicone caulk you can find to seal the interface between the pipe and the drain pan. Let the caulk cure for at least 24 hours before using the washing machine.
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