How to Remove a Floor Drain in Your Shower: A Step-by-Step Guide

Removing a floor drain in a shower is often a necessary step for homeowners tackling a major renovation, addressing a persistent leak, or upgrading to a more modern linear drainage system. While the task might seem daunting, it becomes manageable with the right approach and tools. This guide walks you through the entire process, ensuring you understand each step to complete the job safely and effectively, leaving your plumbing system ready for the next phase of your project.

Preparing for the Project

The first and most critical phase is preparation, which sets the stage for a smooth removal. You cannot simply start unscrewing bolts without considering the surrounding structure and hidden plumbing connections. A proper preparation prevents damage to your shower pan, tiles, and subfloor, saving you from costly repairs later. Gather your tools and materials meticulously before turning off the water supply.

Essential Tools and Materials

Having the correct equipment on hand is non-negotiable for this task. You will need a powerful flashlight to illuminate the drain assembly, a set of adjustable wrenches and channel-lock pliers for loosening fittings, and a standard screwdriver for removing covers. A small reciprocating saw or oscillating tool is invaluable for cutting through old sealant or mortar, while a hammer and chisel help break up the surrounding concrete. Do not forget heavy-duty gloves for protection against sharp edges and debris, safety goggles to shield your eyes, and a bucket to catch any residual water.

Shutting Down the System

Safety is paramount, and it starts with stopping the water flow. Locate the main water shut-off valve for your home and turn it off completely. Open the shower faucet briefly to drain any remaining pressure and water from the lines. Next, you must address the trap. Place your bucket underneath the P-trap pipe located beneath the shower, then loosen the slip nuts connecting the trap to the drainpipe. This releases the water seal and ensures the drain line is empty, preventing a messy spill when you disconnect the drain body.

Removing the Drain Cover and Mechanism

With the water supply off and the trap cleared, you can access the visible components of the drain. The process varies slightly depending on whether you have a traditional round drain or a modern linear style, but the core principle remains the same: remove the restraint holding the mechanism in place.

Disassembling the Top Fixture

Start by unscrewing the grate or cover plate that sits on top of the drain. These are often secured with small screws that might be hidden under a decorative cap, which you can pop off with a flat-head screwdriver. Once the cover is off, you will likely see a large locking nut that secures the drain body to the shower floor. Loosen this nut significantly—usually counter-clockwise—using a basin wrench or a deep socket wrench. With the nut free, the entire drain assembly, including the gasket and strainer, can be lifted upward out of the hole.

Dealing with the Subfloor and Mortar Bed

This is where the physical work intensifies. The drain body is typically anchored in a bed of concrete mortar or set directly into the subfloor, creating a solid connection that requires demolition to remove.

Breaking Up the Mortar or Concrete

If your shower uses a traditional mortar bed, you will see a cylindrical column of concrete surrounding the drain pipe. This mortar is extremely hard, so attempting to pull it out without breaking it is futile. Use a hammer and chisel to chip away at the edges of the mortar, gradually breaking it into smaller pieces. Alternatively, a rotary hammer drill with a masonry bit is highly effective for pulverizing the concrete quickly. Work carefully to avoid cracking the adjacent tiles or compromising the integrity of the shower pan. As you break up the material, use a vacuum or broom to clear the debris, revealing the main drain pipe below.

Accessing the Main Drain Pipe

Once the surface mortar is cleared, you will be looking at the main drain pipe, which is usually a PVC or ABS pipe extending vertically downward from the drain flange. At this point, you need to decide if you are simply removing the drain or replacing the entire pipe section. If you are keeping the pipe for a future reinstallation, be careful not to damage the threads or the connection points. However, if you are installing a new linear drain or changing the plumbing layout, you will likely need to cut this pipe. A reciprocating saw with a coarse-tooth blade or a handheld hacksaw does the job efficiently, allowing you to slice through the pipe just above the subfloor level.

Cleaning the Area and Final Steps

With the old drain physically removed, the final stage is to clean up the workspace and prepare the area for your new installation or repair.

Debris Removal and Inspection

Vacuum out any remaining concrete dust, old sealant, or metal fragments from the hole. Inspect the subfloor for any signs of water damage or rot that might have been hidden behind the old drain. This is your chance to verify that the drain flange is sitting flat on the subfloor and that the hole size is correct for your new drain. If you are switching to a linear drain, you might need to widen the hole or adjust the framing to accommodate the new trough design. Ensure the surface is level and smooth to provide a stable foundation for the new fixture.

Removing a floor drain is a practical skill that empowers you to manage your bathroom renovations with confidence. By following these methodical steps, you transform a potentially messy job into a straightforward project. Remember to take your time, prioritize safety, and double-check each connection before moving on, ensuring a successful outcome that supports the longevity of your shower.