Will Plumber's Putty Stop a Leak on Copper Pipe?

Introduction

When you notice a leak in your home’s plumbing system, it’s natural to want a quick fix, especially if the leak is small and manageable. A commonly used product for plumbing repairs is plumber’s putty (or plumbers mate). It’s a versatile sealant used for sealing joints around sinks, drains, basins, and other plumbing fixtures. But the question remains: Will plumber's putty stop a leak on a copper pipe?

In this blog post, we’ll explore the effectiveness of plumber’s putty for copper pipe leaks, its applications, and what you should consider when dealing with a leak in your plumbing system.

What is Plumber’s Putty?

Plumber’s putty is a soft, moldable material used to create watertight seals between plumbing fixtures and surfaces. Typically made from a blend of clay, oils, and other ingredients, plumber's putty remains flexible after application, making it ideal for situations where a long-lasting seal is needed. Plumber’s putty is most commonly used around sink drain assemblies, basins, and toilet installations, as it helps prevent leaks at these points of connection.

While plumber's putty is excellent for many plumbing applications, it has limitations. So, when it comes to fixing leaks on copper pipes, it’s important to assess whether plumber’s putty is the right solution.

How Does Plumber’s Putty Work?

Plumber’s putty works by creating a temporary seal that fills in any gaps or irregularities in the surface of plumbing connections. When applied, it forms a tight seal that prevents water from seeping through. It is particularly effective on smooth surfaces like metal, ceramic, and plastic.

Because of its flexibility, plumber's putty can adapt to small imperfections in the materials it's sealing, making it an ideal choice for securing fixtures. However, it's important to note that plumber's putty isn’t designed to be used as a permanent repair solution for all types of leaks, especially in situations where pressure or the conditions around the leak are more demanding.

Can Plumber’s Putty Stop a Leak on Copper Pipe?

While plumber's putty is excellent for sealing around fixtures, it is not designed to stop a leak on a copper pipe. Here’s why:

1. Not Made for Pipe Joints: Plumber’s putty is commonly used to seal fixtures like sinks and drains, but it is not intended to seal pipe-to-pipe joints, especially in pressurised plumbing systems like water supply lines. Copper pipes, which are typically used for carrying potable water, are pressurised, and plumber's putty does not provide the strength needed to withstand the continuous flow of water through the pipes.

2. Temporary Solution: Even if you apply plumber’s putty to a leaking copper pipe, it is likely to provide only a temporary seal. Over time, the putty will dry out, lose its flexibility, and possibly crack or break down under the pressure of the water. Additionally, the movement of water through the pipe can push the putty out of place, leaving the leak unresolved.

3. Limited Durability: Plumber’s putty does not form a strong bond with copper, and it is not resistant to heat or pressure over long periods. For a copper pipe under pressure, plumber’s putty is simply not durable enough to provide a long-lasting solution.

What is the Best Way to Fix a Leak in a Copper Pipe?

If you have a leak in a copper pipe, plumber’s putty is not the right tool for the job. Instead, you should consider the following options for a more effective, long-lasting repair:

1. Use Pipe Repair Clamps

For a quick, temporary fix to a leaking copper pipe, a pipe repair clamp can be used. These clamps are designed to seal off the leak by tightening around the pipe. Some repair clamps come with rubber gaskets to ensure a watertight seal. However, while this solution is effective in the short term, it is still recommended to replace the section of the pipe as soon as possible for a more permanent solution.

2. Soldering the Pipe

One of the most effective methods for fixing a leak in a copper pipe is to solder it. Soldering involves melting a filler metal (solder) to create a permanent, watertight seal. To solder a copper pipe, you need to clean the area around the leak, apply flux, and then use a propane torch to heat the pipe. Once the pipe reaches the right temperature, you can feed the solder into the joint, creating a strong bond that stops the leak.

Soldering requires some skill and the right tools, but it provides a reliable, long-lasting fix for leaks in copper pipes. If you are unsure about soldering or lack the experience, it’s best to call a professional plumber for assistance.

3. Epoxy Putty

Epoxy putty is another product that can be used to fix leaks in copper pipes. Unlike plumber’s putty, epoxy putty is much stronger and is designed to bond with metal surfaces, including copper. When mixed and applied to the leak, epoxy putty hardens to form a durable, water-resistant seal. It can be used for both small leaks and larger cracks, providing a much more reliable fix than plumber’s putty.

However, it is still a temporary solution, and the pipe may need to be replaced or professionally repaired over time.

4. Replacing the Damaged Section of Pipe

For a permanent fix, replacing the damaged section of the copper pipe is the best option. This involves cutting out the section of the pipe that is leaking and replacing it with a new length of copper pipe. This is the most reliable and long-lasting solution, as it restores the integrity of your plumbing system and prevents future leaks.

Replacing the damaged section may require a professional plumber, especially if you lack the tools or experience to handle the job.

When Should You Call a Plumber?

While minor leaks can sometimes be handled with DIY fixes, it is always a good idea to call a plumber if you are unsure about how to proceed. A professional plumber can assess the situation and recommend the best solution. They also have the necessary tools and expertise to make sure the leak is properly fixed, saving you from further damage or additional leaks down the line.

Conclusion

While plumber's putty is a useful tool for sealing fixtures and fittings, it is not recommended for stopping leaks in copper pipes. Its flexibility and durability are insufficient for pressurised plumbing systems, and it may only offer a temporary solution at best. For leaks in copper pipes, consider using pipe repair clamps, epoxy putty, or even soldering the pipe for a more permanent fix. If in doubt, always consult a professional plumber to ensure your plumbing system is repaired safely and effectively.

By understanding the limitations of plumber's putty and the best solutions for leaks in copper pipes, you can ensure your plumbing repairs are both effective and long-lasting.

If you're dealing with a leak that’s proving difficult to fix, we’re here to help. At Kesselmann, we offer expert plumbing services in Hull, East Yorkshire, and North Lincolnshire. Don’t let a leak cause more damage – call us today on 01482 770650, or click here to book a plumber online.

Our professional team is ready to provide reliable and efficient solutions, ensuring your plumbing is in top shape.