Mastering the Art: How to Fix a Cracked Toilet Tank at Home

Welcome to our comprehensive guide on how to fix a cracked toilet tank . If you’ve ever experienced the frustration of discovering a crack in your toilet tank, you’re not alone. Cracked toilet tanks are a common problem that can lead to water leaks , potential damage to your bathroom, and increased water bills .

Understanding the causes of these cracks, how to identify them, and the appropriate steps for repair or replacement is crucial for maintaining a functional and efficient toilet. In this article, we will delve into the common reasons for toilet tank cracks, provide guidance on identifying and assessing the severity of cracks, offer step-by-step instructions for repairing hairline cracks, and explore the alternative option of replacing a cracked toilet tank. Whether you’re a DIY enthusiast or simply want to be informed about this common household issue, we’ve got you covered.

So let’s dive in and learn how to fix a cracked toilet tank.

If you’re dealing with a cracked toilet tank, check out our article on how to repair a cracked toilet tank to learn some easy fixes and prevent further damage.

The most important findings at a glance

  • Common reasons for toilet tank cracks include temperature changes, impact, and manufacturing defects.
  • It is not common for toilet tanks to crack, but it can happen due to various factors.
  • To assess the severity of a crack and determine whether to fix it, you can consider factors like the size and location of the crack.

how to fix a cracked toilet tank

1/10 Common reasons for toilet tank cracks

Toilet tank cracks can occur due to various reasons such as incorrect installation, temperature changes, and excessive force. Improper installation can strain the tank and lead to cracks over time. Temperature fluctuations can cause the tank to expand and contract, putting stress on the material and eventually resulting in cracks.

Additionally, applying excessive force or pressure to the tank, like leaning or sitting on it, can also cause cracks. To maintain the durability of your toilet tank and prevent cracks, it is vital to understand and address these factors.

2/10 Is it common for toilet tanks to crack?

Toilet tank cracks can occur more often than expected. Factors such as improper installation, temperature fluctuations, frequency of use, and the tank’s age all contribute to this issue. Regular inspections and maintenance, as well as being mindful of excessive force or pressure, can help prevent cracks.

By understanding and addressing these factors, homeowners can extend the lifespan of their toilet tanks while minimizing the occurrence of cracks.

If you’re dealing with a cracked toilet, check out our article on toilet crack repair for tips on how to fix it and prevent further damage.

how to fix a cracked toilet tank

How to Fix a Cracked Toilet Tank: Simple Steps for Repairing and Preventing Leaks

  • Toilet tank cracks are commonly caused by a variety of factors, including age, high water pressure, and impact damage.
  • While toilet tank cracks are not extremely common, they can occur over time due to wear and tear.
  • Identifying a crack in your toilet tank can be done by visually inspecting the tank for any visible fractures or leaks.
  • Hairline cracks in a toilet tank may not require immediate repair, but severe cracks that cause leaks should be addressed promptly.
  • Repairing a hairline crack in a toilet tank can be done by using epoxy or a specialized toilet tank repair kit.

3/10 Finding cracks in a toilet tank

Discovering fissures in a toilet tank can be a vexing ordeal, but armed with the right knowledge, you can swiftly tackle the issue at hand. Begin by scouring the surface for telltale signs of trouble – minuscule fractures or larger crevices that may appear on the sides, bottom, or near the bolts. Additionally, be vigilant for the presence of water pooling around the base or seeping onto the floor, as these are red flags of potential cracks.

To conduct a more thorough examination , employ the aid of a flashlight to illuminate the inner recesses of the tank. Be meticulous in your scrutiny, inspecting every nook and cranny, including the corners and seams. The luminosity of the flashlight will also prove invaluable in identifying any cracks that may be concealed within the lid or cover, as such breaches can result in water leakage .

Should you indeed uncover any cracks, swift action is imperative to prevent both water damage and exorbitant bills. Waste no time in enlisting the services of a seasoned plumber who can expertly repair or replace the tank. Remember, the early detection and intervention of these imperfections are paramount in safeguarding against further harm and preserving the optimal functionality of your toilet.

4/10 Recognizing hairline cracks vs. severe cracks

Distinguishing between hairline cracks and severe cracks in toilet tanks is of utmost importance. Hairline cracks may be small and difficult to detect, while severe cracks are larger and more pronounced. Hairline cracks may not pose an immediate threat, but severe cracks can lead to leaks and even tank failure.

To identify hairline cracks, keep an eye out for faint lines or marks on the surface of the tank. Additionally, check for any water droplets or moisture around the crack. On the other hand, severe cracks tend to be wider, deeper, and can extend across the entire tank.

It is crucial to address severe cracks promptly as they can cause water leakage, resulting in damage to your bathroom floor, walls, and even the ceiling below. Ignoring a severe crack can lead to a major plumbing disaster. Recognizing the distinction between hairline cracks and severe cracks is key.

Deal with hairline cracks early on to prevent further damage. However, it is imperative to address severe cracks immediately to avoid any water damage or plumbing emergencies.

how to fix a cracked toilet tank

How to Fix a Cracked Toilet Tank: Step-by-Step Guide

  1. Turn off the water supply to the toilet by closing the shut-off valve.
  2. Flush the toilet to drain the water from the tank.
  3. Use a towel or sponge to completely dry the cracked area of the tank.
  4. Apply a generous amount of epoxy adhesive to the crack, covering it completely.
  5. Smooth out the epoxy using a putty knife or your finger, ensuring it fills the crack evenly.
  6. Allow the epoxy to dry and cure according to the manufacturer’s instructions.
  7. Turn on the water supply to the toilet and check for any leaks.
  8. If there are no leaks, flush the toilet to ensure proper functionality.

5/10 Assessing the severity of the crack

The delicate balance of your toilet’s ecosystem can be thrown off by the presence of a crack . But fear not, for all cracks are not created equal. Size and location are key factors to consider when assessing the gravity of the situation.

A crack that spans a significant portion of the tank or is situated near vital areas such as the water inlet or outlet demands immediate attention. To truly understand the magnitude of the problem, look beyond the crack itself. Search for any traces of water damage in its wake.

Dampness or discoloration on the surrounding floor or walls could indicate that water is seeping through the crack, wreaking havoc in its path. Keep a vigilant eye out for any signs of leaking or water loss from the tank, like a steady or intermittent flow of water into the bowl. Once you have gathered all the necessary information, it’s time to make a decision.

If the crack is small and confined to a less critical area, it may be possible to seal it and restore harmony to your porcelain throne. However, if the crack is extensive, affecting vital components, or causing significant water damage, a more drastic measure may be required – the replacement of the entire tank. Remember, time is of the essence when it comes to addressing a cracked toilet tank.

Delaying action could lead to further damage and wasteful water loss. So, carefully assess the severity of the crack and take the necessary steps to resolve the issue. Your toilet will thank you, and so will Mother Earth.

6/10 When to call a professional

When your toilet tank develops cracks, it’s crucial to recognize the signs that indicate the need for professional intervention. Severe or extensive cracks can compromise the tank’s integrity, resulting in leaks or even complete failure. By calling a professional plumber, you can have the crack assessed and determine the most effective solution.

Additionally, water damage in the surrounding area may indicate leaks caused by these cracks, which professionals can identify and address. While minor cracks can sometimes be fixed with DIY methods, if your attempts haven’t resolved the issue and leaks persist, it’s time to seek professional help. Plumbers possess the necessary tools and expertise to seal the crack securely, ensuring a lasting repair.

In conclusion, if you observe severe cracks, water damage, or unsuccessful DIY repairs, it’s essential to reach out to a professional plumber. They will skillfully repair the crack, minimizing the risk of further damage and ensuring the durability of your toilet.

how to fix a cracked toilet tank

Crack Types and Repair Methods Tabelle

Crack Type Repair Method
Hairline crack Application of epoxy sealant
Large crack Replacement of the toilet tank
Cracks near bolts Re-tightening bolts and applying epoxy sealant
Cracks along the seam Replacement of the toilet tank
Stress crack Reinforcement with fiberglass patch and epoxy sealant
Corner crack Replacement of the toilet tank
Cracks due to freezing Replacement of the toilet tank and fixing insulation
Cracks caused by impact Assess damage, repair or replace accordingly
Cracks from structural shifting Stabilize the structure and repair the crack with epoxy sealant
Cracks due to plumbing issues Identify and fix the underlying plumbing issue, then repair the crack

7/10 Before you begin: what you’ll need

Prepare yourself for the task of repairing a hairline crack in a toilet tank by gathering the necessary tools, materials, and safety equipment. You will need a screwdriver, adjustable wrench, and pliers as your tools. For materials, make sure to have epoxy or silicone sealant on hand to create a strong and leak-proof seal.

Lastly, prioritize your safety by wearing rubber gloves and safety goggles . With these items at your disposal, you will be fully equipped to tackle the crack and achieve a successful repair.

Did you know that the average lifespan of a toilet tank is about 20 to 30 years?


My name is Warren and I am a professional plumber licensed and insured in the State of California. I have been in the business for over 10 years and have undertaken small and large projects including bathroom renovation, toilets, garbage disposals, faucets, sinks and kitchen plumbing jobs. This site is based on my experience with toilets. I have installed the best brands and models in all sizes and shapes. I hope this helps you with the unbiased information that you need to make the right decision. …weiterlesen

8/10 Step-by-step instructions for fixing a hairline crack

Repairing a hairline crack in your toilet tank requires careful attention and a systematic approach. Here is a concise guide to help you navigate through the process: Begin by meticulously examining the tank, observing the crack’s location and size. This initial assessment will enable you to determine the most suitable method for repair.

Next, cleanse the cracked area with a mild detergent and a gentle cloth. Ensure that all dirt and residue are removed, as this will facilitate proper adhesion of the sealant. Thoroughly dry the area afterward.

Now, it’s time to choose between epoxy or silicone sealant. Follow the manufacturer’s instructions precisely while applying the chosen sealant over the crack. Ensure complete coverage and smooth out the sealant for a secure bond.

Allow the sealant to dry and cure according to the manufacturer’s guidelines before using the toilet again. This crucial step guarantees a well-sealed crack, preventing any future leaks or damage. By adhering to these steps with patience and thoroughness, you can effectively repair a hairline crack in your toilet tank, prolonging its lifespan.

Remember, taking your time and being meticulous in the repair process will lead to a successful outcome.

If you’re dealing with a cracked toilet tank, check out our article “Toilet Tank Crack Repair” for tips on how to fix it and prevent any further damage.

9/10 Can you just buy a tank for a toilet?

When faced with a cracked toilet tank, the question arises: repair or replace? Assessing the severity of the crack is the first step. A small crack may be fixable, while a larger or deeper crack may warrant a full tank replacement.

Each option has its advantages and disadvantages. Repairing the crack is cost-effective, requiring only the purchase of sealant. It can also be a simple DIY project for those inclined.

However, there is a risk that the repair may not hold up well over time, leading to further issues. On the other hand, investing in a new toilet tank provides a fresh start, free from cracks or concerns. Yet, this option can be more expensive, particularly if the crack is minor and could have been easily repaired.

Ultimately, careful consideration of all factors is necessary before deciding on whether to replace or repair the toilet tank. Consider the severity of the crack, weigh the pros and cons, and factor in the cost of each option.

how to fix a cracked toilet tank

If you’re dealing with a cracked toilet tank, you might be wondering how to fix it without calling a plumber. This video offers a cheap and easy solution to fix the crack and prevent any leaks. Learn how to tackle this common household problem with a simple DIY method.

YouTube video

10/10 Steps to replace a toilet tank

Replacing a toilet tank requires a careful and precise approach. To begin, locate the water valve near the base of the toilet and shut off the water supply. Next, use a wrench to disconnect the water supply line and remove it from the tank.

Then, loosen and remove the tank bolts that secure the tank to the bowl. With utmost care, lift the cracked tank away from the bowl, ensuring a slow and steady motion to prevent any further damage or spills. Finally, dispose of the old tank responsibly and prepare to install the new one.

If you encounter any uncertainties or difficulties along the way, it is advisable to seek the assistance of a professional plumber who possesses the necessary expertise and tools to ensure a seamless replacement process.


In conclusion, understanding what causes toilet tank cracks and knowing how to identify and fix them is crucial for homeowners. This article has provided a comprehensive overview of common reasons for toilet tank cracks, how to identify different types of cracks, when to fix or replace a cracked toilet tank, and step-by-step instructions for repairing a hairline crack. By following these guidelines, users can confidently address this common household issue and save money on professional repairs.

As a recommendation, we encourage readers to explore our other articles on plumbing maintenance and repairs to further enhance their DIY skills and tackle various issues around the house.


Can cracked toilet tank be repaired?

If you notice small cracks on the surface of the toilet tank, don’t worry, these are just minor cosmetic issues that don’t need fixing. However, if you come across hairline cracks below the waterline, you’ll need to do a bit of patching with epoxy to ensure proper functioning. On the other hand, if you find larger cracks below the waterline, it’s a sign that the entire toilet needs to be replaced.

What is the best sealant for a cracked toilet tank?

If you discover a small crack in your toilet tank or bowl, there is a potential solution to prevent leaks. You can use waterproof epoxy to seal the crack effectively. This method can also be helpful for cracks near the toilet’s base, particularly around the bolts that secure it to the floor. By applying epoxy, you can address these issues and potentially avoid more extensive repairs. Please note that this information is accurate as of August 4, 2022.

Can you seal a leaking toilet tank?

To fix a leaking toilet tank, you can replace the worn-out rubber gaskets around the tank bolts and the spud washer. These components can deteriorate and malfunction over time, especially in areas with hard water and mineral buildup. To successfully complete this project, you’ll need a few essential tools: a screwdriver, adjustable wrench, small wire brush, sponge, white vinegar, and rags.

How much does it cost to fix a cracked toilet tank?

The cost of various parts for a toilet repair or replacement can vary depending on the specific components needed. These parts include the wax ring/seal, tank, bowl, and pipe. The price range for the wax ring/seal is typically between $50 and $150, while the tank can cost anywhere from $100 to $250. The bowl usually falls in the range of $100 to $300, and the pipe can range from $100 to $1,200. It’s important to keep in mind that these prices may vary depending on the brand, quality, and other factors.

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