Fixing the Issue: Why Your Bathtub Lip Sticks Out and How to Solve It

Are you tired of dealing with a bathtub lip that sticks out? If so, you’re not alone. Many homeowners struggle with this issue, and it can be both frustrating and unsightly.

In this article, we will explore the anatomy of a bathtub and why the bathtub lip sticks out. We will also discuss how to identify if your bathtub lip is sticking out and provide practical methods to fix the problem. Whether you’re a DIY enthusiast or simply looking for solutions, this article is here to help.

So let’s dive in and discover how to tackle that sticking out bathtub lip once and for all.

Briefly explained: what you need to know about the subject

  • This text provides information about bathtub lips and why they stick out.
  • It explains how to identify if your bathtub lip sticks out and offers methods to fix it.
  • Additional tips are given, including choosing the right cutting tools and comprehensive waterproofing.

bathtub lip sticks out

Understanding Bathtub Anatomy

The delicate formation of a bathtub is a symphony of intricacies, with each element playing its part to create a harmonious whole. Among these, the bathtub lip takes center stage, serving as a vital barrier between the sacred sanctum of the tub and the bustling world of the bathroom. Yet, even in this grand performance, the lip can sometimes steal the spotlight, causing a cacophony of troubles.

One common culprit behind a protruding lip is the misfortune of poor installation or design. If the tub is not bestowed with a perfect alignment during its installation, or if the lip fails to blend seamlessly with its surroundings, it can dare to jut out, disrupting the delicate balance of the bathroom’s aesthetic. This protrusion, seemingly insignificant, can birth a cascade of woes.

It invites the insidious infiltration of water, a relentless invader that can seep through the minuscule gaps, reaching places it should not dare to tread. In its wake, it may usher in the unwelcome presence of mold, flourishing within the hidden recesses of this newfound haven. Furthermore, cleaning the bathtub becomes an arduous task as dirt and grime find solace in the crevices between the lip and its neighboring surface.

To shield against these calamities, utmost care must be taken to ensure the proper installation and alignment of the bathtub. Should the unwelcome sight of a protruding lip grace your eyes, it is in your best interest to summon the aid of professionals, experts in the art of rectifying such maladies. By addressing this issue promptly, you can safeguard against the perils of water damage and extend the lifespan of your cherished bathtub.

If you’re having issues with your bathtub vent, check out our article on bathtub vents to find out how to solve the problem and keep your bathroom properly ventilated.

bathtub lip sticks out

Common Causes of a Sticking Out Bathtub Lip

During the installation of a bathtub, there are various reasons why the lip may protrude. One such reason is improper support, which can result in misalignment and lead to water leakage and cleaning problems. Another factor could be a poorly designed lip that sticks out, creating gaps and cracks where water can seep through, potentially causing damage.

Additionally, incorrect alignment during installation can also cause the lip to protrude. This can result in an uneven appearance and make cleaning more difficult. To prevent the issue of a protruding bathtub lip , it is essential to ensure proper support, design, and alignment during the installation process.

This will effectively eliminate the risk of water leakage , cleaning challenges , and potential damage .

Visual Inspection

As you carefully examine your bathtub, be on the lookout for any signs of a protruding bathtub lip. Keep an eye out for obvious indicators such as discoloration, peeling paint, or the growth of mold. An uneven or misaligned lip can also result in water leakage and make cleaning a challenging task.

Additionally, visible gaps or cracks in the lip serve as clear warnings. Ignoring these signs can lead to water leakage and the flourishing of mold and mildew. To prevent further damage, it is vital to address these issues promptly.

bathtub lip sticks out

Use of Tools

When it comes to fixing a protruding bathtub lip, the right tools are essential. A level and measuring tape will help you identify any unevenness or misalignment. Use these tools to measure and adjust the position of the lip, ensuring a perfect fit.

To seal any gaps or cracks in the bathtub lip, a caulking gun is necessary. Apply a waterproof sealant to prevent water leakage and further damage, ensuring the longevity of your bathtub. For a precise fit around the bathtub lip, a utility knife is your best friend.

Carefully measure and cut the backer board, creating smooth edges and corners for a seamless installation. By having these tools at your disposal, fixing a protruding bathtub lip becomes easier and more effective. With the right tools and techniques, you can achieve a visually appealing and long-lasting result.

Why Does Your Bathtub Lip Stick Out and How to Fix It

  • A bathtub lip is the raised edge that surrounds the perimeter of the bathtub.
  • It is designed to prevent water from spilling over the sides and onto the floor.
  • Common causes of a sticking out bathtub lip include improper installation, settling of the house foundation, or the use of a bathtub liner.
  • Identifying if your bathtub lip sticks out can be done through a visual inspection or by using tools such as a level or ruler.

Waterproofing the Bathtub Walls

The key to keeping your bathtub walls safe from water damage lies in using the right waterproofing materials . These specially designed materials are built to withstand constant exposure to water, providing the ultimate protection against leakage. Properly sealing the joints and corners of your bathtub walls is equally important.

By creating a watertight seal , you can effectively prevent water from seeping through and causing any damage. Take the time to ensure that every corner and joint is sealed correctly to eliminate any potential for water leakage. For an added layer of protection, it is highly recommended to apply multiple layers of waterproofing material.

This extra barrier will further enhance the overall protection of your bathtub walls. Even if one layer gets damaged, the other layers will continue to safeguard against water damage . In conclusion, taking the necessary steps to waterproof your bathtub walls is absolutely crucial .

By using specialized materials, sealing the joints and corners properly, and applying multiple layers of protection, you can ensure that your bathroom remains in pristine condition, free from any water leakage or damage.

If you’re unsure about the right size for your toilet’s drain pipe, check out our article “Toilet Drain Pipe Size” where we explain everything you need to know to make the right choice.

bathtub lip sticks out

Overlap the Two

Creating a secure and visually appealing bathtub lip involves overlapping the materials for added strength and durability. This not only prevents water leakage and damage but also ensures a watertight seal. Carefully aligning and securing the materials is key to achieving a seamless finish.

To guarantee success, it is essential to use waterproofing materials specifically designed for bathtubs. Seal the joints and corners thoroughly to safeguard against water damage and avoid costly repairs. By employing this technique, you can achieve a bathtub lip that not only functions flawlessly but also enhances the overall beauty of your bathroom.

Fixing the Shims or Furring Strips

Ensuring the stability of the bathtub lip is crucial, as it prevents water leaks and potential damage. By using the correct tools and techniques, securely fastening the shims and furring strips will create a solid foundation for your bathtub. This not only ensures long-lasting functionality but also elevates the overall aesthetic of your bathroom.

How to Fix a Bathtub Lip That Sticks Out: A Step-by-Step Guide to a Level and Stable Surface

  1. Inspect the bathtub visually to determine if the lip sticks out.
  2. Use a level or measuring tape to check the extent of the protrusion.
  3. If the lip sticks out, consider using the Shim and Furring Strip Method to fix it.
  4. Start by waterproofing the bathtub walls to prevent any water damage.
  5. Overlap the shims or furring strips to create a stable and level surface.
  6. Secure the shims or furring strips in place using appropriate hardware.
  7. Cut the backer board to fit around the bathtub lip, ensuring proper waterproofing.
  8. Install the backer board, making sure to leave enough space for the lip.

Final Appearance: What to Expect

Transforming your bathtub’s protruding lip into a work of art is easily attainable with the shim and furring strip technique. By meticulously positioning shims and furring strips, you can achieve a flawlessly aligned and visually pleasing finished product that exudes stability and durability. To accomplish this, skillfully fasten the shims and furring strips using the appropriate tools and techniques.

This ensures that your bathtub lip remains robust and steadfast, eliminating any concerns of water leakage or arduous cleaning. Immerse yourself in the splendor and functionality of a bathtub with a perfectly aligned and enduring lip. Delight in your bathing experience, knowing that both beauty and practicality have been seamlessly combined.

bathtub lip sticks out

Importance of Waterproofing

Ensuring your bathtub is properly waterproofed is vital. It not only protects against water damage and mold growth but also helps to avoid serious issues down the line. By investing in correct waterproofing, you can extend the lifespan of your bathtub and steer clear of costly repairs.

Water damage brings about a host of problems in your bathroom, from structural issues to the growth of mold and mildew . Not only is this unsightly, but it also poses health risks . Waterproofing your bathtub acts as a barrier , preventing water from seeping into other areas and keeping your bathroom safe and clean .

Furthermore, inadequate waterproofing can lead to expensive repairs and renovations in the future. Water damage can harm your walls, floors, and even the foundation of your home. By prioritizing proper waterproofing, you can save yourself the trouble and expense of extensive repairs later on.

To sum up, waterproofing your bathtub is essential for preventing water damage, mold growth, and costly repairs. It ensures the longevity of your bathtub and preserves the overall integrity of your bathroom. Never underestimate the importance of this crucial step in bathtub installation and maintenance.

bathtub lip sticks out

Space Considerations

Creating the perfect bathroom oasis goes beyond simply choosing the right bathtub; it’s about optimizing the available space and ensuring ease of movement. Carefully measuring the area and taking into account factors like tub size and layout will determine if your chosen bathtub will fit seamlessly into your bathroom. Don’t overlook the potential of corner tubs or smaller-sized bathtubs to maximize space utilization.

By considering these elements, you’ll craft a bathroom that is both functional and visually pleasing, providing a luxurious and enjoyable bathing experience. So, take the time to measure twice, think smart, and transform your bathroom into a haven of relaxation.

Installing the Backer Board

The correct alignment of the backer board is essential for a strong and leak-free bathtub lip. To achieve this, use a level to ensure the board is perfectly horizontal. Reinforce the joints between the board and bathtub lip to enhance its stability and prevent water seepage.

Select the right screws or nails for a secure fastening. By diligently following these steps, your bathtub lip will be both durable and reliable. Take your time during the installation process and focus on these crucial details to achieve a successful outcome.

Bathtub Lip Repair Methods Comparison Table

Method Name Description Difficulty Level Tools Required Materials Required Waterproofing Cost Time Required Longevity Pros Cons Recommended for
Method 1: Adhesive Fix A simple method using adhesive to fix the bathtub lip that sticks out. Easy Adhesive, scraper Adhesive No $10 – $20 1 hour 1-2 years Quick and easy fix, affordable May not provide a long-lasting solution DIY
Method 2: Caulk Fix A more involved method using caulk to fix the bathtub lip that sticks out. Moderate Caulk gun, scraper Caulk Yes $20 – $30 2-3 hours 3-5 years Provides a waterproof seal, longer-lasting than adhesive Requires more time and effort DIY or professional
Method 3: Bathtub Lip Replacement A complex method involving replacing the bathtub lip entirely. Difficult Hammer, chisel, adhesive, scraper New bathtub lip Yes $200 – $500 4-6 hours 10+ years Permanent solution, ensures proper alignment and support Requires advanced skills and may be costly Professional

Best Options for Backerboard

Selecting the perfect backerboard is crucial for a bathtub installation that withstands the test of time. With various options available, it’s important to weigh their advantages and disadvantages. One popular choice is cement backerboard, renowned for its strength and water resistance.

It provides a sturdy foundation, preventing any unwanted movement or flexing that could compromise the bathtub lip. However, it can be cumbersome and challenging to work with. Alternatively, fiberglass backerboard offers a lightweight and manageable option.

It boasts good water resistance and is less prone to cracking compared to its cement counterpart. However, it may not provide the same level of strength and stability. For those seeking a lightweight and easy-to-handle option, foam backerboard is worth considering.

It possesses excellent insulation properties and is resistant to mold and mildew . However, it may not match the durability of other materials and may require additional waterproofing measures. When making a decision, it’s essential to take into account factors such as the bathtub’s weight and size, water exposure, and the bathroom environment.

By carefully evaluating the pros and cons of each material, you can select the ideal backerboard to ensure a secure and long-lasting bathtub lip.

bathtub lip sticks out

Cutting the Backer Board Around the Bathtub Lip

Crafting precise cuts when working with backer board around the bathtub lip requires careful consideration and the use of appropriate tools. To ensure a clean outcome, accurate measurements and the right techniques are essential. One approach involves scoring the backer board using either a utility knife or saw along the desired cut line, subsequently snapping it to create a neat break.

While this method is convenient and straightforward, it may not yield satisfactory results when working with thicker or denser materials. Alternatively, employing a jigsaw or circular saw equipped with a fine-toothed blade offers greater precision, particularly when dealing with thicker materials. It is crucial to proceed slowly and closely follow the intended cut line.

Regardless of the chosen method, precise measurements are paramount. Double-checking measurements before making any cuts guarantees a seamless fit around the bathtub lip. Lastly, having the right tools and employing proper techniques is crucial.

A sharp utility knife or saw, a straight edge for guidance, and a steady hand are indispensable for achieving clean cuts in the backer board. By adhering to these recommendations, you can confidently achieve a professional-looking installation when cutting the backer board around the bathtub lip.

bathtub lip sticks out

Tools and Hardware to Use

In order to address a protruding bathtub lip, it is crucial to gather the necessary tools. Here are the key items required:

1. Screws and nails: Select the appropriate type and size for your backer board and surrounding structure. Opt for corrosion-resistant options to ensure durability.

2. Caulking gun: This tool is essential for applying a waterproof sealant along the edges of the backer board. It guarantees a watertight seal and prevents any leaks. Look for a caulking gun that offers smooth and even application.

3. Level and measuring tape: These tools play a vital role in accurately installing the backer board. The level helps maintain horizontal or vertical alignment, while the measuring tape ensures precise measurements and a proper fit. By utilizing the correct screws, nails, caulking gun, level, and measuring tape, you will possess everything necessary to rectify a protruding bathtub lip.

Remember, meticulous attention to detail and the use of appropriate tools will result in a secure and long-lasting repair.

Did you know that the average lifespan of a bathtub is around 10-15 years? So if your bathtub lip sticks out, it might be a sign that it’s time for a replacement!


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.


Cutting Tips and Techniques

In the delicate art of cutting the backer board for your bathtub lip, precision reigns supreme. It is within your power to select from a variety of cutting methods, each one promising clean and accurate cuts. The choice of the cutting tool itself is paramount, be it a trusty utility knife or a formidable saw, depending on the very materials at hand.

It is imperative that you wield a blade of sharpness, for it ensures cleaner cuts, and should it become dulled, a replacement is in order. To embark upon the sacred path of smooth and accurate cuts, one must first measure and mark the backer board with utmost care. A straight edge or level shall serve as your unwavering guide, leading you towards the path of straight cuts.

Patience is key, my dear reader, for it is through slow and steady cuts that mistakes and splintering are avoided. And yet, my dear reader, technique is not to be underestimated. Apply even pressure and allow the tool to perform its duty, refraining from forcing the blade or saw.

The wise among us practice upon scrap pieces before venturing forth to make the actual cuts, for it is through such practice that confidence is gained and skills are honed. In the realm of backer board cutting, armed with the right tools and armed with these sacred teachings, one can achieve the pinnacle of precision and cleanliness. Your installation shall be transformed into a spectacle of professionalism, and the bathtub lip shall stand as a testament to its secure and long-lasting nature.

bathtub lip sticks out

Creating Good Joints in the Corners

Achieving a sturdy and watertight bathtub lip requires mastering the art of caulking . Opt for a top-notch bathroom caulk to ensure optimal results. Apply it at a 45-degree angle, ensuring complete coverage and proper adhesion .

For a seamless and polished appearance, expertly smooth the corners using a tool or your own finger. Eliminate any excess caulk for a pristine finish. By diligently adhering to these steps, you’ll safeguard against water damage and revel in a bathtub lip that stands the test of time, free from bothersome leaks.

Choosing the Right Cutting Tools

The Art of Choosing the Perfect Cutting Tools In the realm of precise backer board cuts, the importance of selecting the right cutting tools cannot be understated. With a plethora of options available, tailored to specific materials and project needs, the task at hand becomes one of careful consideration. Begin by pondering the material you will be working with.

A utility knife, for instance, proves invaluable for backer board cuts, guaranteeing clean, accurate incisions that minimize unsightly damage and uneven edges. Next, tailor your choice to the demands of your project. When tackling larger endeavors, a power saw or circular saw reigns supreme, ensuring efficiency in every stroke.

On the other hand, for smaller tasks, the handheld coping saw or jigsaw emerges as the ideal companion. Embrace the art of patience as you embark on the quest for the perfect cutting tool. Take into account the intricacy of your cuts, the grandeur of your project, and the very essence of the materials at hand.

Only through this meticulous selection process can you hope to achieve the pinnacle of precision and professionalism in your backer board cuts.

If you’re dealing with a leaking bathtub drain, check out our article on how to fix a leaking bathtub drain to learn effective solutions and prevent future leaks.

bathtub lip sticks out

Do you have a bathtub with a lip that sticks out? Don’t worry, we have a solution for you! In this video, we will show you how to solve this problem using a tub flange backer board. Watch and learn how to fix your bathtub and make it look seamless again.

YouTube video

Comprehensive Waterproofing

Never underestimate the crucial role of thorough waterproofing when it comes to installing a bathtub lip. This vital step involves sealing all seams and joints to safeguard against potential water damage. It is essential to invest in top-notch waterproofing materials for lasting and reliable results.

Regular maintenance and reapplication are key to preventing problems and prolonging the lifespan of your bathtub lip. By prioritizing waterproofing, you can revel in the luxury of a water-resistant and resilient addition to your bathroom.

bathtub lip sticks out

Importance of Following Each Step

In the pursuit of a flawlessly installed bathtub lip, it is imperative to meticulously adhere to each step. This meticulousness guarantees a seamless alignment, averting the perils of water leakage. The omission of even a single step can result in misalignment, unsightly gaps, and bothersome cracks, all of which contribute to undesirable water seepage and the arduous task of cleaning.

Employing the appropriate tools and employing the correct techniques are essential in ensuring that the backer board aligns harmoniously with the lip. Additionally, the application of a waterproof sealant is indispensable in achieving a watertight seal. It is essential to approach this endeavor with unwavering attention to detail and a generous supply of patience, if one desires a bathtub that is both enduring and visually pleasing.

1/2 Leave a Comment

Maintaining the integrity of your bathroom and protecting it from potential damage is of utmost importance, and one area that requires special attention is the bathtub lip. The last thing you want is water leakage causing havoc in your sanctuary. To ensure this doesn’t happen, here are a few tips to keep in mind:

1. Keep a watchful eye: Regularly inspect the bathtub lip for any signs of trouble. Look out for gaps, cracks, or misalignment, and if you find any issues, address them immediately.

By staying vigilant, you can nip potential water leakage in the bud.

2. Seek professional help: If you suspect that the bathtub lip was poorly installed, don’t hesitate to consult a professional. It’s better to be safe than sorry, and an expert can fix any installation problems that may be causing water leakage.

3. Seal the deal: Invest in a high-quality waterproof sealant. Applying this sealant to any gaps or cracks in the bathtub lip will create a watertight barrier, preventing water from seeping through and causing damage.

4. Keep it clean: Regular maintenance is key to preventing water leakage . Clean the bathtub lip regularly, removing soap scum, debris, and any pesky mold that may have taken up residence. By doing so, you’ll prevent blockages and potential water leakage.

By taking these simple yet effective steps, you can ensure that water leakage from a protruding bathtub lip is a thing of the past. Remember, prompt action is always the best course of action to avoid costly repairs or renovations down the line.

bathtub lip sticks out


In conclusion, understanding why a bathtub lip sticks out and how to fix it is crucial for homeowners seeking to maintain the functionality and appearance of their bathroom. By identifying the common causes and utilizing the appropriate methods, such as the shim and furring strip method or cutting the backer board to fit around the tub lip, individuals can successfully address this issue. It is important to emphasize the importance of comprehensive waterproofing and choosing the right cutting tools to achieve the desired results.

Following each step diligently and considering space considerations and good joint creation in corners are also essential. This article provides a comprehensive guide for addressing a sticking out bathtub lip, ensuring that readers can confidently tackle this problem. For more helpful articles on bathroom maintenance and repairs, we recommend exploring our other informative content related to bathtub and plumbing issues.


What is the lip of a bathtub?

The rim of your bathtub is the upper edge or lip that serves as a stable base for the tub and prevents water from overflowing. It not only supports the tub but also acts as a barrier to catch any water that may spill out when the tub is filled to the top.

What is bathtub flange?

A bathtub drain flange is the visible part of the drain in the tub, also known as a “drain body” or “drain basket” by some manufacturers. It is available in various finishes and offers a range of stopper options to help fill the tub.

What is a tile lip for a bathtub?

The tile flange is a useful feature that allows you to extend the wall tiles downwards over the flange. By doing so, it effectively prevents water spray from the shower and splashes from the bath from seeping in between the bath and the tiles. This not only helps maintain the overall aesthetics of your bathroom, but also serves as a protective barrier against potential water damage to the wall and floor in the tub deck area. Installing a bath with a tile flange ensures long-term durability and minimizes the risk of any costly repairs in the future.

Should cement board overlap the tub?

To ensure that the tiles have a secure surface to adhere to, it is important for the backer board to extend beyond the tub flange. This can be achieved by placing shims between the backer board and the studs, ensuring that the wall is perfectly vertical. Additionally, it is recommended to leave a 1/4″ space between the tub ledge and the backer board for proper installation.

Leave a Reply