How to Replace Shower Drain: A Step-by-Step Guide

Is your shower drain perpetually clogged, cracked, or just plain unsightly? A faulty shower drain can lead to slow draining, unpleasant odors, and even water damage if leaks develop. Ignoring these problems can result in costly repairs down the line, impacting not only your shower but potentially the surrounding floor and walls. Replacing a shower drain might seem daunting, but with the right tools, a bit of patience, and clear instructions, it’s a manageable DIY project that can save you money and restore your shower to its former glory.

Replacing a shower drain isn’t just about aesthetics or convenience; it’s about protecting your home from potential water damage. Leaky drains can seep water into the subfloor, leading to mold growth, rot, and structural issues that require extensive and expensive repairs. By proactively replacing a failing shower drain, you prevent these problems and ensure the longevity of your bathroom. Plus, a properly functioning drain ensures a cleaner, healthier, and more enjoyable showering experience.

What are the steps, tools, and common pitfalls of replacing a shower drain?

What tools do I need to replace a shower drain?

Replacing a shower drain requires a few essential plumbing tools to ensure a successful and leak-free installation. You’ll need a drain wrench (also known as a dumbbell wrench or spud wrench) to loosen and tighten the drain flange, plumber’s putty or silicone caulk to create a watertight seal, a flathead screwdriver or putty knife to remove old putty, pliers or channel locks for gripping, and potentially a hacksaw or reciprocating saw if the old drain is severely corroded or stuck. Safety glasses and gloves are also recommended to protect yourself during the process.

Having the right tools readily available will streamline the drain replacement process and minimize potential complications. The drain wrench is specifically designed to grip the internal ribs of the drain flange, providing leverage to loosen it without damaging the shower pan or surrounding tiles. If the old drain is extremely stubborn, applying penetrating oil beforehand can help to loosen any corrosion or buildup. A small container to collect any water or debris that may be released during drain removal will also help keep your work area clean. In addition to the basic tools, it’s a good idea to have a few extras on hand, such as a clean rag to wipe away excess putty or caulk, a small brush to clean the drain opening, and a utility knife for trimming any excess material. Depending on the type of drain you’re installing, you might also need Teflon tape to seal threaded connections. If access to the drain from underneath the shower is limited, a basin wrench may be a useful alternative to the drain wrench. Taking the time to gather all the necessary tools before you begin the project will save you time and frustration in the long run.

How do I remove the old shower drain without damaging the shower pan?

Removing an old shower drain without damaging the shower pan requires patience and the right tools. Start by carefully removing any visible screws or the drain flange. Then, use a drain removal tool (like a dumbbell or internal pipe wrench) to grip the inside of the drain and slowly unscrew it counterclockwise. Apply penetrating oil if needed and use gentle, consistent pressure to avoid cracking or chipping the shower pan material.

Removing a shower drain can be tricky because the drain is often corroded or stuck in place due to mineral buildup. Before you start wrenching, try applying a penetrating oil like WD-40 or Liquid Wrench around the drain where it meets the shower pan. Let it sit for at least 15-30 minutes, or even longer if possible, to help loosen the connection. If the drain is particularly stubborn, gently tapping around the drain flange with a rubber mallet can help break the seal. When using a drain removal tool, make sure it’s properly sized for the drain. Too small and it won’t grip effectively; too large and it could damage the drain or the shower pan opening. Apply steady, even pressure while turning the tool. Avoid jerky or forceful movements. If the drain absolutely refuses to budge, consider cutting it out with a reciprocating saw or oscillating multi-tool, being extremely careful not to cut into the shower pan. Use a metal-cutting blade and work slowly and deliberately. This is generally a last resort because of the risk of damage.

What type of sealant should I use for a new shower drain?

For a new shower drain installation, use a plumber’s putty that is specifically designed for drain applications. This putty provides a watertight seal between the drain flange and the shower base, preventing leaks around the drain opening.

Plumber’s putty is a malleable clay-like substance that remains pliable over time, allowing for adjustments and preventing cracking. Unlike caulk or silicone, plumber’s putty is designed to create a compression seal. When the drain is tightened, the putty is compressed between the drain flange and the shower base, filling any minor imperfections and creating a watertight barrier. Ensure you use a generous amount of putty, forming a rope around the underside of the drain flange before setting it into place. Avoid using silicone caulk as the primary sealant under the drain flange. While silicone can be used in conjunction with plumber’s putty in some situations (e.g., filling small gaps after the drain is tightened), it should not be the sole sealant. Silicone can be more difficult to remove if the drain needs to be replaced in the future, and it may not compress as effectively as plumber’s putty to create a reliable seal in this specific application. Always follow the shower drain manufacturer’s instructions for the recommended sealant and installation procedure.

How do I tighten the new drain properly to prevent leaks?

Tightening the new shower drain effectively involves achieving a firm, even seal between the drain flange, shower base, and drainpipe. This usually means hand-tightening initially, followed by using a wrench or specialized drain tool to tighten further, but avoid overtightening, which can crack the shower base or damage the drain assembly.

Achieving that perfect, leak-proof seal requires a delicate balance. Start by hand-tightening the drain components as much as possible. This will help align everything before applying significant force. Next, use the appropriate tool – often a spud wrench or a specialized shower drain tool – to grip the drain body from above while holding the drainpipe assembly below steady with another wrench. Tighten in small increments, checking the alignment frequently. Your goal is to compress the sealing putty or rubber gasket evenly, creating a watertight barrier. Stop tightening the moment you feel firm resistance and the drain body no longer rotates easily. It’s crucial to avoid the temptation to overtighten. Excessive force won’t necessarily create a better seal and can easily damage the shower base, especially if it’s made of acrylic or fiberglass. Overtightening can also strip the threads on the drain assembly or crack the drain flange. If you’re using plumber’s putty, some excess should squeeze out as you tighten; wipe this away neatly with a damp cloth. After installation, run water and check for leaks from underneath the shower. If you see drips, slightly tighten the drain assembly in small increments until the leak stops. If leaks persist even after careful tightening, you might need to disassemble, inspect the components for damage or misplacement, and reapply fresh plumber’s putty or replace the rubber gasket.

What if the drain pipe is corroded and needs replacing?

If the drain pipe itself is corroded, replacing it becomes a more involved project, often requiring access to the plumbing below the shower. The process usually involves cutting out the old corroded pipe, cleaning and preparing the connecting pipes, and then installing a new section of pipe using appropriate fittings and plumbing techniques.

Replacing a corroded drain pipe requires careful planning and execution. First, accurately assess the extent of the corrosion to determine how much of the pipe needs replacement. Gain access to the pipe; this may involve cutting into the floor or ceiling below the shower, depending on your plumbing configuration. Before cutting any pipes, turn off the water supply to the house to avoid flooding. When cutting, be aware of the type of pipe material (PVC, copper, or cast iron) and use the appropriate cutting tool. After cutting, carefully clean the connecting pipes to ensure a good seal with the new pipe. Selecting the correct replacement pipe material is crucial for longevity and compatibility. While you can often replace an old pipe with the same material, consider upgrading to a more durable option if the original pipe was prone to corrosion. When connecting the new pipe, use the proper fittings and adhesives, adhering to local plumbing codes. For example, PVC requires PVC primer and cement, while copper requires soldering or compression fittings. After installation, test the drain thoroughly for leaks before closing up any access points. If you’re not comfortable with plumbing work, consider hiring a qualified plumber to handle this more complex task.

How do I choose the right size replacement shower drain?

To choose the right size replacement shower drain, the most accurate method is to simply measure the diameter of the existing drain opening in your shower base or floor. This measurement, typically 2 inches or 3 inches, will dictate the size of the new drain body you need. Be sure to check the drain pipe size below the shower floor as well.

While measuring the existing drain opening is the most reliable way, you can often determine the size by looking at the product information if you have it. If you’re replacing the drain because it’s leaking or damaged, taking it out and measuring the pipe directly avoids any guesswork. Keep in mind that the visible part of the drain (the strainer) is often a standard size and isn’t the dimension to focus on; concentrate on the diameter of the drain body that connects to the plumbing beneath the shower floor.

Finally, it’s crucial to check local plumbing codes before purchasing a new drain. Some areas have specific requirements for drain size and type, especially concerning trap size and material. Verifying compliance ensures your installation is both functional and meets regulatory standards, preventing future problems.

What’s the best way to clean the drain opening before installing the new drain?

The best way to clean the drain opening before installing a new drain is to thoroughly remove all old plumber’s putty, caulk, rust, and debris from the shower base opening and the pipe threads. Use a combination of tools like a putty knife, wire brush, and sandpaper to ensure a clean, smooth surface for the new drain to properly seal.

Once you’ve removed the old drain, carefully inspect the shower base opening. Old plumber’s putty can harden like cement, so a stiff putty knife or even a small, flat-head screwdriver might be necessary to chip it away. A wire brush, either handheld or attached to a drill (use cautiously to avoid scratching), is excellent for removing rust and corrosion from metal drain pipes. Sandpaper can then be used to smooth out any remaining imperfections, ensuring a level surface for the new drain’s flange to sit flush. Finally, vacuum the entire area to remove any loose particles. A clean surface is absolutely crucial for achieving a watertight seal with the new drain. Consider wiping the area down with a clean, damp cloth and letting it dry completely before applying fresh plumber’s putty or silicone caulk during the new drain installation. This step is often overlooked, but it’s essential for a long-lasting and leak-free shower drain.

And that’s all there is to it! Hopefully, this guide has helped you conquer your shower drain replacement. Thanks so much for reading, and we hope you’ll come back again for more DIY tips and tricks to make your home a little happier (and drier!).