The Shocking Truth About Toilet Flanges And Glue: What You Never Knew

When embarking on a bathroom renovation or plumbing project, understanding the intricacies of toilet flange installation is crucial. One of the most common questions that arise is whether the toilet flange, the base that secures the toilet to the floor, should be glued to the drainpipe. This blog post delves into this topic, providing comprehensive answers and expert insights to guide you through this essential plumbing task.

What is a Toilet Flange?

A toilet flange is a circular metal or plastic fitting that is installed on the drainpipe protruding from the floor. It serves as the foundation for the toilet, providing a secure connection and preventing leaks. The flange has four or six bolts that extend upward, which are used to fasten the toilet to the floor.

Does the Toilet Flange Get Glued to the Pipe?

The answer is both yes and no. While gluing the toilet flange to the drainpipe is not always necessary, it is highly recommended in certain situations.

When to Glue the Toilet Flange

• Leaking Drainpipe: If the drainpipe has a crack or leak, gluing the flange will help seal the connection and prevent further water damage.
• Unstable Soil: In areas with unstable soil or a weak subfloor, gluing the flange will provide additional support and prevent the toilet from rocking or shifting.
• High-Traffic Areas: In commercial or public restrooms with heavy foot traffic, gluing the flange ensures a more secure connection and reduces the risk of the toilet becoming loose.

When Not to Glue the Toilet Flange

• Temporary Installations: If the toilet is being installed temporarily or for a short period, gluing the flange may not be necessary.
• Cast Iron Drainpipes: Gluing to cast iron drainpipes is not recommended due to the potential for damage to the pipe.
• Future Remodels: If you plan to remodel the bathroom in the future, gluing the flange may make it more difficult to remove the toilet.

How to Glue a Toilet Flange

If you decide to glue the toilet flange, follow these steps:

1. Clean the Surfaces: Thoroughly clean the flange and drainpipe with a wire brush or sandpaper to remove any dirt or debris.
2. Apply Primer: Apply a thin layer of PVC primer to the surfaces to improve adhesion.
3. Apply Cement: Apply a generous layer of PVC cement to both the flange and drainpipe.
4. Insert Flange: Insert the flange into the drainpipe and twist it slightly to ensure a tight fit.
5. Secure with Screws: Tighten the bolts on the flange to secure it to the floor.

Alternatives to Gluing

If gluing the toilet flange is not an option, consider these alternatives:

• Mechanical Flange: A mechanical flange uses a rubber gasket to create a watertight seal between the flange and drainpipe.
• Wax Ring: A wax ring is a temporary seal that can be used to connect the toilet to the flange.
• Flange Extender: A flange extender can be used to raise the flange to the correct height if it is too low.

The Bottom Line: Informed Decision-Making

Understanding the factors that influence whether or not to glue the toilet flange to the pipe empowers you to make an informed decision for your specific installation. By carefully considering the type of drainpipe, soil conditions, and future plans, you can ensure a secure and leak-free toilet connection.

Answers to Your Most Common Questions

Q: What type of glue should I use for a toilet flange?
A: Use PVC cement specifically designed for plumbing applications.

Q: Can I glue a toilet flange to a plastic drainpipe?
A: Yes, PVC cement can be used to glue a toilet flange to a plastic drainpipe.

Q: How long should I wait before using the toilet after gluing the flange?
A: Allow the PVC cement to cure for at least 24 hours before using the toilet.

Q: Can I use a wax ring instead of gluing the flange?
A: Yes, a wax ring can be used as a temporary seal, but it is not as secure as gluing the flange.

Q: What do I do if the flange is too low?
A: Use a flange extender to raise the flange to the correct height.