Does a Toilet Need to be Perfectly Level? The Ultimate Guide

As a home improvement specialist with over 10 years of experience in bath renovations and plumbing repairs, I‘m often asked if a toilet needs to be completely perfectly level. The short answer is no – minor inconsistencies are okay. However, proper leveling during install is crucial to ensure your toilet functions properly and prevent leaks or shifting over time.

In this ultimate guide, I‘ll share my proven expertise on all aspects of leveling toilets, from how to diagnose wobbling to step-by-step instructions for DIY leveling. My goal is to equip you with the skills and knowledge needed to get your toilet stable and working its best. Let‘s get started!

Why Leveling Your Toilet Matters

Leveling a toilet correctly serves multiple important purposes:

**Prevents water damage** – A toilet that rocks back and forth breaks the wax seal and can leak water onto the surrounding floor. This causes ugly water stains and damage.

**Enables complete draining** – For effective flushing, the toilet must sit evenly so waste flows down the proper slope. Otherwise draining problems occur.

**Provides proper stability** – An unleveled, rocking toilet is not securely installed. It may eventually come loose and shift entirely.

**Promotes sanitation** – Bacteria and grime can collect in gaps under a toilet that isn‘t level, causing unhealthy conditions.

**Improves longevity** – Stress from an unstable toilet can lead to bowl cracking and broken tank components over time.

While a bit of minor wobble may be acceptable, anything beyond that calls for correcting your toilet‘s level. Paying attention to proper leveling during install is also wise to avoid problems down the road.

How Much Can a Toilet Be Out of Level?

Toilets are designed to function properly and resist leaking even if slightly unleveled. However, there are limits:

• The toilet should not rock or shift when moderate weight is applied. Some minor movement may occur when bearing down forcefully.

• Both side-to-side and front-to-back levelness should be no more than 1/4 inch out over the entire base.

• The toilet bowl must sit flatly on the floor with the wax ring fully flattened beneath it.

• No gaps or daylight should be visible between the base of the toilet and floor.

As long as the toilet remains stable within those parameters, small inconsistencies in level can be tolerated. However, exceeding those limits risks water damage, wobbling, and an insecure install. Call a plumber immediately if you observe excessive rocking or gaps under the toilet base.

Tools You‘ll Need for Leveling a Toilet

Leveling and securing a wobbly toilet requires just a few simple tools you may already have on hand:

• Adjustable wrench – For turning nuts and bolts to adjust toilet position.

• Level tool – A basic torpedo level works best to diagnose uneven spots.

• Screwdriver – For removing toilet seat and accessing tank internals if needed.

• Shims – Plastic or wood wedges used to fill gaps and adjust level.

• Caulk/adhesive – For securing shims tightly once level is achieved.

• Bucket – For emptying water from toilet tank and bowl during the process.

• Gloves – To protect hands and improve grip when handling toilet.

Step-by-Step Guide to Levelling Your Toilet

Follow this simple process to properly level and stabilize your toilet:

1. Turn off water supply and empty all water

Shut off the valve connecting the water supply line to the toilet tank. Flush to empty remaining water from tank and bowl completely. Use a small bucket and sponge to remove any last drips if needed.

2. Loosen mounting nuts

Use an adjustable wrench or pliers to loosen the nuts on the bolts that secure the toilet base to the floor. Loosen them just enough to allow the toilet to be shifted slightly when pressure is applied.

3. Check level and identify uneven spots

Place a torpedo level vertically on the sides of the bowl, then horizontally across the tank. Note any areas where the bubble is off-center. These are the spots that need shimming.

4. Place shims in gaps

Add shims underneath the toilet base on any uneven spots, tapping them gently into place with a hammer. Hard plastic or wood shims are best.

5. Retighten mounting nuts

Once the toilet sits evenly on the shims, tighten the mounting nuts carefully and evenly so the bolts secure the toilet down tightly. Do not overtighten them.

6. Seal shims with caulk/adhesive

Run a bead of clear silicone caulk or construction adhesive along the edges of the shims to hold them firmly in position. This prevents shifting.

7. Reconnect water and test level

Turn on the water supply and allow the tank to fill. Check the level again and make any needed final adjustments before fully tightening nuts.

With these simple DIY steps, you can successfully level your own toilet and prevent leaks, rocking, and other problems. Call a plumber for assistance if significant floor or flange work is required.

Why Your Toilet May Be Unlevel

There are several common reasons a toilet may become unleveled or unstable:

• Settling floor – If the floor beneath the toilet sinks or shifts over time, it throws off level.

• Improper install – The toilet may not have been adequately shimmed and leveled during original installation.

• Loose mounting bolts – Bolts can loosen over years of use, allowing the toilet to rock and shift.

• Damaged flange – A corroded or broken flange prevents the toilet from sitting solidly on the floor.

• Weight changes – Over time, added weight from fixtures, users, or pressure can unlevel the toilet.

• Plumbing issues – Drainage pipe problems underneath can cause uneven toilet seating.

Being aware of what causes toilets to become unleveled makes it easier to address the underlying problem, not just the symptom of rocking/wobbling. In some cases, a damaged flange or floor may need repaired first before leveling.

How to Prevent Toilet Leveling Issues

You can avoid many toilet leveling problems by taking proper precautions:

• Check floor level – Ensure floor is even before setting toilet. Shim flooring first if needed.

• Use funnel guides – Wax seals with plastic funnel guides prevent leaks between toilet and floor.

• Alternate tightening – Tighten mounting nuts carefully in a crisscross "X" pattern to keep toilet even.

• Go for stability – Focus on minimal rocking rather than perfect precision levelness.

• Make adjustments early – Level and shim toilet before connecting water supply line for easier access.

• Allow bowl to fully seat – Set toilet straight down rather than sliding into place to maintain wax seal.

• Inspect over time – Periodically check level and retighten bolts to prevent loosening issues.

Proper prep work and vigilance both during and after toilet installation can eliminate the need for extensive leveling repairs down the road.

Signs Your Toilet Needs to be Leveled

Watch for these symptoms that indicate a problem with your toilet‘s level and stability:

• Rocking/wobbling – Toilet visibly shifts when moderate body weight is placed on it.

• Gaps visible – Open spaces between base of toilet and floor are noticeable.

• Loose bolts – Mounting nuts/bolts are loose and can be shifted by hand.

• Movement when plunged – Toilet base shifts when plunger is pressed down into bowl.

• Slow flushing – Poor drainage of waste and water due to uneven installation.

• Running water – Constant noise or trickle of flowing water coming from tank/bowl area.

• Warped floor – Surrounding floor or tiles appear cracked, uneven, or damaged near base.

Don‘t ignore these signs of potential toilet instability. Address the issue promptly before major leaks, property damage, or other problems arise.

Tips for Shim Use When Leveling Toilets

Shims act as spacers to fill in gaps between the uneven floor and the toilet base. Here are some shim tips:

• Plastic vs wood – Plastic is longest-lasting but wood shims are cheaper. Use whatever‘s on hand.

• Cardboard – Surprisingly effective budget shimming option. Just layer for more lift.

• Stack if needed – Use multiple shims on top of each other if one alone doesn‘t lift high enough.

• Stagger direction – Alternate with some shims running front-to-back and others side-to-side.

• Tap into place – Gently tap shims under toilet base with hammer to wedge tightly.

• Place near bolts – Positioning shims close to floor bolts provides maximum stability.

With practice and patience, shims can effectively fill any gaps and get your toilet level. Caulking them in place secures the repair.

Adjusting the Flange if Unleveled

If the toilet flange itself sits unevenly, here‘s how to remedy:

• Assess damage – Look for corrosion, wear, or breakage. Replace flange if severely damaged.

• Check level – Place level across flange and note high/low spots.

• Shim flange – Use thin shims under one side of flange to lift into proper position.

• Grind concrete – For minimal flange adjustment, concrete slab can be partially ground down in needed areas.

• Secure shims – Caulk edges of shims to flange before re-installing toilet.

• Replace seal – Use a new wax ring each time toilet is removed and reset.

Repairing an unleveled flange provides a solid base for your toilet and ensures no leaks between the toilet and flooring.

Troubleshooting Tricky Toilet Leveling Issues

Having trouble getting your toilet properly level? Try these troubleshooting tips:

Toilet rocks after shimming – Review each shim placement and be sure they are wedged tightly underneath toilet base. Add more shims.

Shims compressing – Switch from softwood or cardboard to more rigid plastic or composite shims that won‘t compress under weight.

Flange blocked – May need to cut away laminate flooring around flange so it can be accessed and shimmed correctly.

Flange severely damaged – If flange is badly corroded or broken, replacement may be required. Call a plumber for help.

Floor badly uneven – Significant subfloor work may be needed to stabilize and level floor before shimming toilet.

Unlevel immediately after install – Indicator that floor support is inadequate. Check for moisture or heat damage beneath toilet.

Don‘t get frustrated! With some patience and creativity in applying the right leverage and support, virtually any toilet can be properly leveled.

When Do-It-Yourself Leveling is NOT Recommended

While many basic toilet leveling jobs can be completed by handy homeowners, there are certain scenarios where you SHOULD call in a professional plumber:

• Badly damaged or broken flange – Replacing an old flange requires disconnecting drainage pipes.

• Extensive subfloor work needed – Plumbers have proper tools and knowledge for significant flooring repairs.

• Fragile decorative flooring – Special care must be taken with certain surfaces like marble or tile.

• Concealed plumbing issues suspected – A pro can assess for hidden leaks or pipe problems causing loosening.

• Septic systems – Precise toilet drainage slope is crucial with septic tanks.

• Previous failures – If you‘ve tried unsuccessfully to level the toilet multiple times yourself.

Proper toilet installation and leveling requires expertise. Don‘t damage your property or injure yourself – call a licensed plumber for help if needed.

Answering Common Toilet Leveling Questions

Leveling a toilet on your own for the first time can be intimidating. Here are answers to some frequently asked questions:

How do I remove the toilet to access the flange?
Turn off water supply, empty all water from tank/bowl, then detach supply line. Unscrew floor mounting nuts/bolts, break seal, and carefully lift toilet straight up and off flange.

What exactly are shims and where do I get them?
Shims are thin wedges made of plastic, wood, or cardboard that are inserted beneath toilet base to make it level. They can be found with other building supplies at home improvement stores.

Is re-leveling a toilet something I can safely DIY?
Yes, as long as proper precautions are taken, like turning off water supply and wearing gloves to protect hands. Get help lifting toilet. Review manufacturer instructions.

Can I just tighten the nuts more to stop rocking?
No, tightening nuts and bolts alone does not lift and properly level toilet. Shims must be used underneath to evenly lift toilet base up to the proper height.

How do I know if the flange needs to be replaced vs. shimmed?
If flange is badly corroded or broken, replacement is required. For minor flange leveling, shimming should do. Assess damage visually first.

Don‘t be afraid to tackle toilet leveling yourself. Just break the project down into manageable steps and use the proper tools and techniques. With a methodical approach, you CAN successfully DIY it!