Top 5 Mistakes When Installing a Toilet Flange Riser (And How to Avoid Them)

You’re ready to upgrade your bathroom, and a new toilet is on the list. But there’s a problem: the existing toilet flange is too low. This common issue can lead to leaks, wobbly toilets, and even damage to your floor. Fear not, brave DIYer! This guide will walk you through the process of how to install a toilet flange riser, so you can conquer this plumbing challenge and enjoy a smooth, leak-free toilet installation.

Why You Need a Toilet Flange Riser

A toilet flange is the metal ring that sits on the floor and connects to the drain pipe. The toilet bowl bolts to this flange, creating a seal that prevents waste from escaping. When a flange is too low, the toilet sits at an awkward angle, making it difficult to install and potentially causing leaks.

A toilet flange riser solves this problem by extending the flange’s height, allowing the toilet to sit level and secure. Installing a riser is a relatively simple DIY project, and it can save you a significant amount of money compared to calling a plumber.

Gathering Your Supplies

Before you dive into the project, gather the necessary supplies:

• Toilet Flange Riser: Choose a riser made of PVC or ABS plastic, ensuring it’s compatible with your existing drain pipe. Consider the height you need, as risers come in various sizes.
• PVC Cement: For a secure and leak-proof connection between the riser and the flange.
• PVC Primer: Used to clean and prepare the surfaces before applying cement.
• Toilet Wax Ring: Creates a watertight seal between the toilet bowl and the flange.
• Caulk: For sealing any gaps between the riser and the floor.
• Level: Essential for ensuring the riser is installed correctly and the toilet sits level.
• Adjustable Wrench: For tightening the bolts that secure the riser to the flange.
• Utility Knife: For cutting the riser to the desired length.
• Safety Glasses: Protect your eyes from debris and chemicals.
• Gloves: Protect your hands from contact with PVC cement.

Preparing for Installation

Now that you have all your supplies, it’s time to prepare for installation:

1. Turn Off the Water Supply: Locate the water shut-off valve for your toilet and turn it off. Flush the toilet to drain any remaining water in the bowl.
2. Disconnect the Toilet: Carefully remove the toilet from the floor by unscrewing the bolts holding the bowl to the flange. If the bolts are rusted or stuck, use a wrench or pliers to loosen them.
3. Remove the Old Flange: If the old flange is damaged or corroded, it’s best to remove it. This can be done with a pry bar or a utility knife.
4. Clean the Drain Pipe: Thoroughly clean the drain pipe to remove any debris or buildup. This ensures a smooth and leak-free connection with the riser.

Installing the Toilet Flange Riser

Now it’s time to install the riser:

1. Apply Primer and Cement: Apply a thin layer of PVC primer to the drain pipe and the bottom of the riser. Let the primer dry for a few minutes, then apply a bead of PVC cement to the same areas.
2. Connect the Riser: Carefully slide the riser onto the drain pipe, ensuring it’s centered and flush with the floor. Hold it in place for a few minutes to allow the cement to set.
3. Secure the Riser: Once the cement has dried, use the adjustable wrench to tighten the bolts that secure the riser to the flange. Make sure the bolts are snug but not overtightened.
4. Level the Riser: Use a level to ensure the riser is perfectly level. If necessary, adjust the riser slightly by loosening the bolts and repositioning it.
5. Caulk the Gaps: Apply a bead of caulk around the perimeter of the riser to seal any gaps between the riser and the floor.

Installing the Toilet

You’ve successfully installed the riser, and now it’s time to install the new toilet:

1. Install the Wax Ring: Place a new toilet wax ring on the top of the riser. Make sure the wax ring is centered and flush with the riser.
2. Position the Toilet: Carefully lower the toilet bowl onto the wax ring, ensuring it’s centered and aligned with the riser.
3. Secure the Toilet: Tighten the bolts that secure the toilet to the flange, making sure they are snug but not overtightened.
4. Connect the Water Supply: Reconnect the water supply line to the toilet.
5. Flush and Test: Flush the toilet several times to check for leaks. If you notice any leaks, tighten the bolts or replace the wax ring.

Finishing Touches

Once you’ve installed the toilet and verified there are no leaks, you can complete the finishing touches:

1. Caulk the Base: Apply a bead of caulk around the base of the toilet to prevent water from seeping into the floor.
2. Clean Up: Clean up any excess caulk or debris.

Beyond the Basics: Troubleshooting and Tips

• Choosing the Right Riser Height: Measure the height of your existing toilet flange and the desired height of your new toilet. Subtract the old flange height from the new toilet height to determine the required riser height.
• Dealing with Stubborn Bolts: If the bolts are rusted or stuck, try using a penetrating oil to loosen them. If that doesn’t work, you may need to cut the bolts off with a hacksaw.
• Replacing the Drain Pipe: If the drain pipe is damaged or corroded, it’s best to replace it before installing the riser.
• Checking for Leaks: Always check for leaks after installing the riser and toilet. If you notice any leaks, tighten the bolts or replace the wax ring.

The Final Verdict: A Leak-Free Toilet Installation

Installing a toilet flange riser is a simple and effective way to solve a common plumbing problem. By following these steps, you can ensure a smooth and leak-free toilet installation and enjoy peace of mind knowing you’ve tackled this DIY project successfully.

Quick Answers to Your FAQs

Q: Can I install a toilet flange riser on a concrete floor?

A: Yes, you can install a toilet flange riser on a concrete floor. Just ensure the riser is securely attached to the existing flange and that the floor is level.

Q: How often should I replace the wax ring?

A: You should replace the wax ring every time you remove or reinstall a toilet. This helps ensure a watertight seal and prevents leaks.

Q: What if the toilet flange is too high?

A: If the toilet flange is too high, you may need to use a toilet flange reducer. This is a similar device to a riser but instead of extending the flange, it reduces its height.

Q: Can I use a toilet flange riser on a cast iron drain pipe?

A: While it’s possible, it’s not recommended. Cast iron pipes are prone to corrosion and may not be compatible with PVC cement. If you have a cast iron drain pipe, consult a plumber for professional advice.