Post By Admin
June 6, 2025So, your toilet’s wobbly, leaking, or just not sitting right? If you’re in the middle of replacing your toilet or tackling some bathroom upgrades, chances are the toilet flange is part of the picture.
This little piece plays a big role as it connects your toilet to your home’s plumbing system. With the right guide, installing a toilet flange isn’t rocket science.
In this step-by-step walkthrough, we’ll cover everything from the tools you need to each stage of the process, so you can secure your toilet properly and keep leaks at bay!
That means no more wobbles and less chance of needing to call a toilet repair service constantly. Let’s get it done right the first time!
What Should You Prepare Before Installing a Toilet Flange?
Before you start fitting anything into place, you’ll want to make sure you’ve got all the tools and materials lined up.
As you could imagine, there’s nothing worse than being in the middle of a toilet installation and realising you’re missing one small yet essential item. Let’s avoid that DIY disaster, shall we?
You’ll need a few common tools that you might already have lying around:
- Adjustable wrench for tightening bolts
- Screwdrivers both flathead and Phillips will come in handy
- Putty knife or scraper to remove any leftover wax or grime
- Tape measure for accurate placement
- Level to make sure the toilet sits flat and stable
- Drill (with masonry bit) only if you’re working with concrete floors
For materials, here’s what to grab before you begin:
- New toilet flange.
- Wax ring or wax-free seal
- Toilet bolts and washers
- PVC primer and cement (if you’re working with PVC pipes)
- Rags or paper towels
- Rubber gloves (optional)
How to Install a Toilet Flange?
Before you get started, don’t forget to shut off the water supply and flush the toilet to empty the tank.
Once the old toilet is removed, take a minute to clean around the drain area. Any old wax or debris left behind can mess up the seal on your new toilet flange.
Moreover, if you’re dealing with an overflowing toilet, fixing or upgrading the flange could solve the issue. A poor seal or misaligned flange can definitely lead to leaks or backups. So, if your toilet’s been giving you trouble, this is a solid step in the right direction.
With everything ready and the workspace clean, you’re all set to jump into the real action. Here’s how to get your toilet flange installation done right!
1. Remove the Old Flange (If There’s One in Place)
You’ll need to unscrew or unbolt any existing flange from the floor and clean off any remaining wax from the pipe opening by using a putty knife.
If the old flange is glued in (especially with PVC), you may need a bit of elbow grease to pry it out or cut it off.
A little not from us: If the flange is in decent condition but sits too low or high, you might just need a flange extender instead of replacing the whole thing.
2. Inspect the Drain Pipe and Subfloor
Check to see if the subfloor around the pipe is solid and has no water damage or rot. Then, check the drain pipe.
If everything looks sound, you’re good to go! If not, you may need to repair the floor or replace part of the pipe before continuing.
3. Dry Fit the New Flange
Place the new toilet flange over the drain pipe to see how it fits. The flange should sit level on top of the finished floor, with the center aligned directly over the pipe.
However, if it’s too low, you can use a flange extender. If it’s too high, you may need to trim the pipe or use a thinner wax ring.
In addition, make sure the bolt slots are positioned at 9 and 3 o’clock. That’s where your toilet bolts will go later.
4. Attach the Flange to the Floor
Once you’re happy with the fit, it’s time to secure it.
For PVC pipes, apply primer and cement to both the pipe and flange, then press and twist the flange into place. Hold it for a few seconds to bond.
Next, screw the flange into the floor using sturdy floor screws. If you’re attaching it to concrete, you’ll need a masonry bit and appropriate anchors.
5. Set the Toilet Bolts
Drop the toilet bolts into the slots on the flange, with the threaded ends pointing up.
These will line up with the holes on the toilet base when you’re ready to set it. Double-check they’re standing straight and evenly spaced.
6. Prepare for the Toilet Installation
With your flange securely in place and bolts set, you’re ready for installing the toilet itself. At this point, you’ll want to have your wax ring handy and everything lined up for a smooth placement.
And that’s it for the flange! You’ve just nailed one of the most important steps in setting a toilet flange correctly. With everything in place, your toilet is one step away from being rock-solid and leak-free.
6 Best Practices When Installing a Toilet Flange
Alright, so you’ve got the flange installed — nice work! We’ve got extra tips on a few of best practices when installing a toilet flange.
These best practices aren’t just about doing things “by the book”, they’re about avoiding future headaches. A tiny wobble or small leak might not seem like a big deal now, but over time it can turn into a costly mess.
So take the extra five minutes, do it right, and enjoy a trouble-free throne for years to come!
1. Always Check Flange Height
The flange should sit flush with the finished floor, not below it. If it’s too low, you risk leaks. If it’s too high, the toilet might rock or not sit properly. Flange extenders or thicker wax rings can help if your measurements are off slightly.
2. Secure It Tightly to the Floor
A wobbly flange equals a wobbly toilet, so make sure you use sturdy screws (and anchors if needed) to fasten the flange to the subfloor. Even a little movement can lead to future leaks or damage.
3. Make Sure the Flange Is Level
Use a level tool to double-check that the flange is sitting evenly. A crooked flange means your toilet may lean or not seal properly.
4. Align Toilet Bolts at 9 and 3 O’clock
This simple positioning trick makes your closet flange installation a breeze. It ensures that the toilet drops onto the bolts easily and is evenly secured. If they’re off-center, lining up the toilet becomes a frustrating game of trial and error.
5. Replace the Wax Ring if Reinstalling a Toilet
If you’re pulling a toilet out and reinstalling it (say, after doing work on the floor), always replace the wax ring. Reusing an old one is asking for leaks. Wax-free seals are also a great alternative if you prefer a cleaner option.
6. Double-Check Connections to the Toilet Cistern
Once the toilet is back in place, make sure everything’s tight and aligned at the toilet cistern, including the water supply line. If you’re planning to replace the toilet seat or even replace the toilet cistern while you’re at it, now’s the time!
FAQ about Toilet Flange Installation
We hope the answers to the below FAQs will help clear up any confusion about setting a toilet flange and getting things sealed up right!
1. Should a toilet flange be flush with the floor?
Yes, your toilet flange should sit flush with the finished floor (tile, vinyl, etc.). If it’s too low, the wax ring might not seal properly, which leads to leaks.
Too high? The toilet can rock or sit unevenly. Use flange spacers or extenders if needed to get that perfect level.
2. Does the toilet flange have to be glued in the pipe?
If you’re working with a PVC or ABS pipe system, then yes, you’ll typically use PVC primer and cement to glue the flange into the drain pipe.
However, some newer systems or repair flanges are designed to be installed without glue and secured mechanically instead. Just be sure to follow your product’s specific instructions.
3. Does a toilet flange need to be bolted to the floor?
Absolutely. Bolting the flange to the floor keeps it and the toilet stable. A loose flange is a one-way ticket to a wobbly toilet and possible leaks.
Whether you’re attaching it to a wood subfloor or concrete slab, make sure it’s tight and secure.
4. How far should a toilet flange stick above the floor?
Ideally, it shouldn’t stick up at all. It should be level with the finished floor. If you find the flange is rising more than ¼ inch above the floor, it could prevent the toilet from sealing correctly or sitting flat.
In those cases, you might need to cut the pipe down slightly or opt for a thinner wax ring.
5. Do you place the wax ring on the toilet or the flange?
Both methods work, as long as the wax ring stays centered and seals properly. Just don’t double-stack wax rings unless you’re working with a low flange and know what you’re doing.
Conclusion
From gathering the tools, leveling the flange, securing it tightly, to making sure your toilet sits rock-solid, you’re now equipped to tackle toilet flange installation projects with way more confidence!
But hey, if at any point your DIY turns into an emergency moment, our friendly team at Neighbourhood Plumbing is just a call away!
Call us today or browse our blog for more pro-level advice made simple.
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
