Are you shopping for vinyl pool liners for your swimming pool and uncertain what thickness is best? Want to verify in layman’s terms what your pool builder has offered? Unsure what a “mil” measurement even means?
At River Pools, we specialize in fiberglass pools, but through our experience in the pool industry, we’ve helped many homeowners better understand how vinyl pools work as well. In this guide, we’ll walk through what pool liner thickness actually means, how it affects durability, and what you can expect when it comes to cost.
What does pool liner thickness actually mean?
When people talk about pool liner thickness, they’re referring to how thick the vinyl material is, measured in mils.
Note: a mil is not a millimeter. A mil is 1/1000 of an inch, also called a “thou” (as in a thousandth). About 39 mils equals 1 mm.
Most vinyl pool liners typically fall into a few common options, usually 20, 27, 28, or 30 mil. The choice between them is yours, but it’s worth keeping in mind that your pool liner thickness is something you’ll likely live with for 5 to 9 years, so it’s not a small decision.
Another unit of measurement is the gauge, which actually varies in size from dealer to dealer. If you’re shopping for a vinyl liner and it’s measured in gauges, ask for the measurement in mils to be sure you get what you need.
Are all pool liners the same thickness throughout?
Not exactly, and this is where things can get a little confusing.
Vinyl liners come in two main types: embossed and non-embossed.
Embossed liners have a textured surface. Because of that texture, the liner varies in thickness, with small peaks and valleys. When manufacturers list the pool liner thickness, they’re measuring the highest points, not the entire material underneath, so the thickness isn’t completely consistent across the surface.
Non-embossed liners, on the other hand, are smooth and consistent all the way through. They may not feel as soft, but the thickness is the same all the way through.
In many cases, a 20 mil embossed liner is considered a more budget-friendly option, which is why it’s commonly used.
Both options can perform well, but understanding this difference can help you make a more accurate comparison.
Does a thicker pool liner mean better durability?
A thicker pool liner can offer more resistance to everyday wear and tear.
Things that can affect a liner over time include:
- Dog claws
- Tree branches
- Small sharp objects
- Long toenails
Yes, toenails. Pro tip: you should keep your nails short enough not to puncture your swimming pool liner.
A thicker liner acts like a tougher outer layer. It doesn’t mean damage can’t happen, but it may reduce the likelihood of punctures or make repairs easier if something does occur.
A helpful way to think about it is this: a thicker pool liner like a good insurance policy. Problems will
likely come up either way, but a thicker vinyl is additional protection from the worst damage.
The downside is thicker vinyl is heavier, more expensive, and can be harder for installers to work with. It doesn’t always lay into place as easily, and wrinkles can be more difficult to smooth out.
Thinner liners, on the other hand, are more flexible. They tend to fit corners better and usually come with a lower upfront cost.
A properly installed thinner liner can often hold up better than a thicker liner that wasn’t installed correctly. Issues like stretching, wrinkles, or air gaps, especially in corners, can lead to premature wear regardless of pool liner thickness.
How long does a vinyl pool liner typically last?
Most vinyl pool liners last somewhere in the range of 5 to 9 years, regardless of pool liner thickness.
While thicker liners may offer a bit more durability, several factors influence lifespan, including:
- Installation quality
- Water chemistry
- Sun exposure
- How the pool is used
If both liners are properly installed, the thicker liner should last longer, although there are so many variables involved that it’s hard to predict exactly how much longer.
What can you do to help your pool liner last longer?
No matter which pool liner thickness you choose, how you care for it can make a big difference.
A few simple habits can help extend the life of your liner:
- Keep water chemistry balanced, especially chlorine and pH
- Make sure the liner is installed properly from the start
- Reduce exposure to sharp objects or pet claws
Think of it like maintaining anything else around your home, small, consistent care can go a long way.
How much does pool liner thickness affect cost?
It can cost several hundred dollars to upgrade to a thicker vinyl pool liner. Each time a vinyl liner increases total thickness or increases from embossed to non-embossed, the cost rises due to the increase in required material.
In today’s market, many homeowners might expect an upgrade between thickness levels to cost around $300 to $700+ or more, depending on the liner and material.
In general, the more vinyl used, the higher the price.
A 20 mil liner is usually one of the more budget-friendly options and is commonly used in many vinyl liner pools.
As you move up, you may come across options like a 28/20 embossed liner. This means the liner is thicker at the textured surface (28 mil) and thinner at the base layer (20 mil). Because it uses more material than a standard 20 mil liner, it typically costs more.
If you continue upgrading, a fully non-embossed 28 mil liner is the same thickness across the entire surface. Since it uses more material throughout, not just at the raised areas, it’s often one of the higher-priced options.
Each step up in pool liner thickness increases material usage, which is the main reason for the price difference.
Alternatives to inground vinyl liner pools
If you’re researching pool liner thickness, you may also be comparing different types of inground pools.
Vinyl liner pools are one option, but some homeowners also consider fiberglass or concrete pools.
Fiberglass pools have a durable gelcoat surface that isn’t easily punctured by things like dog claws or sharp objects. Since there’s no liner to replace, this can help reduce long-term ownership costs over time.
Concrete pools are durable as well and won’t be scratched or split by dog claws or sharp objects that fall in the pool. While they often come with higher ongoing maintenance needs, many homeowners appreciate their classic look and the fact that there’s no liner to replace down the road.
Final thoughts on pool liner thickness
When you’re planning a vinyl liner pool, pool liner thickness is one of those details that might seem small at first, but it plays a role in how your pool holds up over time.
A thicker liner may offer added durability, while a thinner liner may provide flexibility and a lower upfront cost. Both can work well when paired with proper installation and care.
If you’ve made it this far, you’re already ahead of the game. Understanding how pool liner thickness works gives you the clarity to evaluate your options, have better conversations with your installer, and move forward with a plan that fits your backyard.
Frequently Asked Questions
What is the best pool liner thickness for a vinyl pool?
Most vinyl pools use liners in the range of 20 to 30 mil. A thicker pool liner thickness can offer more resistance to wear and tear, while a thinner liner may be more flexible and cost-effective. The right choice often depends on your budget, how you plan to use your pool, and your expectations for durability.
How much does it cost to upgrade pool liner thickness?
Upgrading your pool liner thickness typically costs around $300 to $700+ or more, depending on the liner style and material. As thickness increases, more vinyl is used, which is the main reason for the price difference.
What does embossed vs non-embossed pool liner mean?
Embossed liners have a textured surface with small peaks and valleys, so the pool liner thickness can vary slightly across the surface. Non-embossed liners are smooth and uniform, meaning the thickness is consistent throughout. This difference can affect how the liner feels, how it’s measured, and how much material is used.
What is the difference between a 20 mil and 27 mil pool liner?
The main difference is thickness. A 27 mil liner is thicker than a 20 mil liner, which can make it more resistant to punctures and everyday wear. However, thinner liners are typically more flexible and may fit more easily during installation. Both options can perform well depending on how the liner is installed and maintained.
Does a thicker pool liner last longer?
If installed and maintained correctly, a thicker pool liner should last longer. Most vinyl liners last around 5 to 9 years, and factors like installation quality, water chemistry, and sun exposure often have an impact on the lifespan along with the thickness.
From the Author
I’m Cristian Shirilla, Marketing Manager at River Pools and co-owner of a fiberglass pool installation company in Virginia. I’ve worked with many homeowners who are comparing vinyl pools and trying to understand how details like liner thickness actually impact their experience long term.
I wrote this article to break down what can feel like a technical topic into something more practical and easier to understand. My goal is to help you look at your options clearly so you can move forward with a decision that fits your backyard and how you plan to use it.
From the Manufacturer
At River Pools, we’ve seen how details like pool liner thickness can influence how a vinyl pool performs over time.
It may seem like a small specification, but it can play a role in how a pool looks, feels, and holds up, especially when it comes to durability, maintenance, and long-term expectations.
If you’re at the point where you want to talk through your specific situation, the next step is connecting with a trusted independent installer in your area. They can help you evaluate your options and apply what you’ve learned here to your own backyard.
Ready to start the conversation?
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