
Replacing tiles in a drain pan can be a challenging task, especially when dealing with waterproofing issues or broken tiles. It is often necessary to replace a shower drain when remodeling due to old bolts that may be rusted or improper heights. Before beginning any work, it is important to understand the underlying cause of the problem, such as faulty connections or cracks in the drain assembly. To replace tiles in a drain pan, one must carefully remove the tiles, being cautious not to damage the waterproofing layer, and then install new tiles or consider alternative solutions like a fiberglass unit. Additionally, when working with shower drains, it is crucial to clean the PVC plastic screw threads and address any threading issues that may arise due to brand variations.
Characteristics and Values Table for Replacing Tile in a Drain Pan:
| Characteristics | Values |
|---|---|
| Tools Required | Hammer, chisel, angle grinder, dremel with cutoff wheel attachment |
| Preparation | Block the drainpipe with a rag, clean PVC plastic screwthreads with silicone lubricant or petroleum jelly |
| Caution | Avoid puncturing the waterproofing layer beneath the drypack concrete |
| Drain Pan Removal | Cut the lip off at the bottom edge of the tile using an angle grinder, or use a dremel to cut around the drain pipe |
| Replacement | Glue a new drain in place with a coupling and short pipe, ensure proper height and slope |
| Tile Removal | Remove at least one row of tiles along the pan, possibly two rows depending on damage |
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What You'll Learn

Removing tile around a drain grate
Prepare the Area:
Start by blocking the drainpipe with a rag to prevent any debris from falling into the drain assembly. This will also help catch any tile or concrete bits, protecting the shower p-trap.
Remove the Drain Grate:
The process of removing the drain grate will depend on how it was installed. In some cases, you may be able to simply unscrew the grate. If it is grouted in, you may need to use a screwdriver to break the grout and pop the grate out. Be careful not to damage the surrounding grout or tiles.
Expose the Existing Drain:
Use a sharp wood chisel to carefully chip away at the tiles and concrete layer around the drain. It is important to only remove enough material to expose the top of the existing drain and the screw-in drain grate piece. Do not chisel too deeply, as you risk puncturing the waterproofing layer, which could result in the need for a whole new shower.
Clean the Drain Base:
Once the drain grate is removed, clean the PVC plastic screwthreads in the drain base. These can become grungy with crystallized uric acid and debris. Use a silicone lubricant or petroleum jelly to make this step easier and ensure the threads are free of debris.
Replace the Drain Grate:
When installing the new drain grate, remember that it doesn't need to be threaded completely tight. It just needs to match the new tile height. The original plumbing may not have been installed perfectly plumb, so you may need to make adjustments to ensure the new drain grate assembly is reasonably plumb and drains well.
Re-tile the Area:
With the new drain grate in place, you will now need to re-tile the area. Ensure that you center the pattern and make precise cuts around the drain grate for a professional finish. Don't forget to allow for proper drying time before using the shower.
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Avoiding damage to the waterproofing layer
When replacing tiles in a drain pan, it is important to take precautions to avoid damaging the waterproofing layer. Here are some detailed steps and tips to help you achieve this:
Firstly, identify the type of shower pan and its age. Older shower pans may have a lead pan with a mud floor on top, while newer ones are more likely to have a PVC liner with a mud floor. This is important because the removal process differs depending on the type of pan. If you have a mud floor, use a hammer and chisel to carefully break up the mud into pieces that can be pulled out by hand. Be cautious not to pound the chisel all the way through, as this could damage the pan.
If you are dealing with a PVC liner, the tile removal process may be more delicate. Try to gently lift and pop the floor tiles off without damaging the liner. If the tiles are well-adhered, use appropriate tools like a Bosch hammer drill to carefully lift them out of the way. Avoid using excessive force that could puncture or tear the liner.
Before beginning any work, it is crucial to block the drainpipe with a rag to prevent debris from falling into it. Additionally, always clean the drain base and PVC plastic screw threads to ensure they are free of crystallized uric acid and other grime. This step is important for maintaining the functionality of your drain assembly.
When working on the walls, it is recommended to remove the drywall to which the tiles are attached. This will help ensure that you do not accidentally damage the waterproofing layer behind the walls. It is also suggested to plan on removing all wallboards and replacing them with new ones, such as CBU with waterproofing or a kerdi-type board.
Finally, when replacing tiles, consider using products like Redgard, hydroban, or a decoupling membrane to enhance waterproofing. Properly seal all screw holes and transition joints with an ASTM C920 sealant or 100% silicone or urethane. By following these steps and taking your time, you can successfully replace tiles in a drain pan while avoiding damage to the waterproofing layer.
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Cleaning the PVC plastic screwthreads
When replacing a tile shower drain, you will need to clean the PVC plastic screwthreads in the drain base. This is because they are likely to be dirty with crystallized uric acid. To do this, first block the drainpipe with a rag.
There are several tools that can be used to clean the screwthreads. One method is to use a screwdriver to remove the old sealant, following the threads and wiping away the sealant as it comes out. A plastic knife can also be used to scrape off old pipe dope and silicon caulk. You can then use a small amount of rubbing alcohol on a rag to remove any residual sealant.
Alternatively, a stiff bristle brush can be used to clean the screwthreads. One source suggests using a brass wire brush, while another recommends an old toothbrush, which worked "pretty well".
It is important to note that if you are using a compound to clean the screwthreads, you should ensure that it is approved for use on plastic pipes. Many compounds contain solvents that can soften and damage the plastic.
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Using a lubricant to ease the process
Replacing tiles in a drain pan can be a challenging task, especially if you want to avoid damaging the surrounding tiles or the waterproofing layer underneath. Here are some tips on using a lubricant to ease the process:
Before you begin, it is important to gather the necessary materials and tools, such as a pry bar, a putty knife or flathead screwdriver, and a lubricant. You may also need a saw if you have to cut through any tiles or the drain pan itself. Silicone lubricant or petroleum jelly can be used to ease the process of removing and replacing tiles in a drain pan. This is especially useful when dealing with the drain base threads, which can become "gnarly" due to crystallized uric acid buildup or cross-threading by a previous installer.
By applying a lubricant to the threads, you can make it easier to unscrew and detach the drain grate assembly. Remember that different plumbing brands may have slightly different thread specifications, so don't force the threads to match if they don't align perfectly. The drain grate assembly simply needs to match the new tile height and be reasonably tight.
Additionally, when removing tiles around the drain, you may encounter stubborn gaskets that refuse to budge. In such cases, a flathead screwdriver or putty knife can be used to pry them up, and a lubricant can be applied to these areas to facilitate their removal. This can also be helpful when dealing with tile caulk, which can be challenging to remove.
If you are replacing the entire drain pan, you may need to cut through the surrounding tiles or the pan itself to access the underlying structure. In this case, a lubricant can be used to ease the process of removing any remaining tile sections or cutting through the pan. It is important to work carefully and deliberately to avoid damaging the waterproofing layer, as puncturing it could require a complete shower replacement.
Overall, using a lubricant can help make the process of replacing tiles in a drain pan smoother and less challenging. It is an important tool to have on hand, along with the necessary safety equipment, to ensure a successful tile replacement project.
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Gluing a new drain into place
When gluing a new drain into place, there are a few key steps to follow. Firstly, it is important to ensure that the drain base threads are free of any debris. This can be done by blocking the drainpipe with a rag and cleaning the PVC plastic screw threads. If the previous installer cross-threaded the drain base threads, they may be challenging to clean thoroughly.
Next, you can apply an appropriate adhesive. For PVC pipes, PVC primer and cement can be used. It is important to wear safety goggles and protective gloves when working with these products, as they can be messy and hazardous to your eyes. Lay a tarp or towel over your work surface to minimize cleanup. Before gluing, it is crucial to do a dry fit to check for alignment and proper resistance. Mark the pipe and the fitting for quick alignment before applying the glue, as the glue dries very quickly.
Apply the primer with a brush to the outside of the PVC pipe and the inside of the fitting. The primer softens the plastic and helps the cement adhere better. Then, apply the cement to both the pipe and the fitting and press them together. You will only have a few seconds to get the alignment right before the pieces are stuck together, so work quickly and carefully.
Hold the pipe firmly in place for 20-30 seconds to allow the glue to set. If you do not hold it in place, a tiny gap may form, which can lead to leaks under pressure.
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Frequently asked questions
Removing tile around a drain grate requires careful hammering and chiseling so as not to puncture the waterproofing layer beneath the drypack concrete. You will likely need to remove the bottom row of tiles along the pan.
If you puncture the waterproofing layer, you will need a whole new shower.
After removing the tiles, block the drainpipe with a rag and clean up the PVC plastic screwthreads in the drain base.





































