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The Daily Insight

Which pond liner should I use

Author

Robert Spencer

Published Apr 12, 2026

High-density polyethylene (HDPE) liners, also known as reinforced polyethylene liners, are one of the best choices for flexible pond liners. They offer even better puncture resistance than either EPDM or PVC liner, while weighing roughly one-third as much and being half as thick.

How do I choose a pond liner?

To calculate how much pond liner you need, measure the maximum width, maximum length and maximum depth, then add double the depth measurement onto both width and length to get the size of pond liner you need. Then add another 30cm/12” onto the width and length to give you some spare liner for laying around the edge.

Which is better PVC or EPDM pond liner?

Pond liners made from EPDM, a synthetic rubber, are significantly more flexible and durable than liners made from PVC or HDPE. Because EPDM liners contain no plasticizers that can become brittle with age, the liners maintain flexibility and resist cracking in cold weather conditions down to minus 40 degrees Fahrenheit.

What thickness pond liner is best?

When tree root penetration is a problem or there’s regular traffic in and out of the pond, liners 30 mils and thicker are recommended even for basic ponds. Even backyard ponds benefit from a 30 mil or greater liner to prevent rocks and roots from wearing holes in a thinner material.

Which is best butyl or EPDM?

If you want a simple answer, choose EPDM pond liners available in three different thicknesses for small to more demanding applications. It is the more modern material, it looks virtually the same, it is slightly more flexible and so easier to install and, best of all, it is typically 30% cheaper than Butyl.

Are HDPE pond liners any good?

HDPE has very good UV resistance and functions well in cold temperatures. … HDPE liners are commonly used in landfills and chemical containment sites, but they are also safe and well-suited for fish ponds. No matter where they are, HDPE liners are very durable, having been found to last upwards of 36 years when covered.

Are EPDM pond liners any good?

EPDM Rubber Pond Liner EDPM is rated down to -45 C. It is fish safe and is even rated for potable water use. … Most of the available pond liner is made by Firestone, so there is a level of confidence in the quality. Butyl rubber pond liners can also be used, but they have become very expensive and are no longer popular.

Do I need underlayment for pond liner?

Underlayment is an important part of building your pond and water features. It helps protect your pond liner from being punctured, and more, over time.

How big of a pond liner do I need?

Here is how to calculate pond liner size for your project: Length: Add the maximum length, plus twice the maximum depth, plus at least one extra foot (5 feet extra with large ponds 50’+). Width: Add the maximum width, plus twice the maximum depth, plus at least one extra foot (5 feet extra with large ponds 50’+).

What is the difference between EPDM and HDPE?

Durability and Aging Firestone EPDM is a synthetic rubber material designed for decades of outdoor exposure to the elements and inert to the effects of buried environments containing microorganisms. HDPE is a semicrystalline thermoplastic material that is also designed for exposed conditions.

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Is PVC safe for ponds?

Most larger ponds or koi ponds will use either PVC or ABS rigid pipe rated for DWV (Drain, Waste & Vent). … PVC is the most common rigid pipe for ponds and is rated for pressure as well as DWV. ABS pipe is also rated for DWV, and while it is strong enough for pond applications, it isn’t usually rated for pressure.

What is the difference between EPDM and PVC roofing?

The key difference between EPDM and PVC is that the EPDM is a synthetic rubber, which is synthesized from petroleum byproducts whereas, PVC is a thermoplastic, which can be melted down at high temperatures and thus, acquiring mouldable properties and can be cooled again to gain back the solid form.

Is EPDM the same as butyl?

EPDM (ethylene propylene diene Monomer) is a synthetic rubber with properties very similar to butyl rubber pond liners. Historically butyl rubber pond liners have always been seen as ‘top of the tree’ in terms of desireability for pond builders in theUK.

Can you use EPDM for pond liner?

Firestone PondGard Pond Liner Proudly made in America. EPDM Pond Liner (Ethylene Propylene Diene Monomer) is a synthetic rubber, highly flexible stable material that is not only easy to work with, but long lasting and aquatic safe.

Is EPDM the same as pond liner?

EPDM pond liner (ethylene propylene diene monomer) is the ideal solution for water retention and widely used to line lakes, garden ponds and man-made streams. EPDM is a synthetic rubber with properties very similar to butyl pond liner and has become a leading product for lining garden ponds.

What is Butyl liner?

Butyl pond liner is made of 0.75mm thick synthetic rubber has been used to line ponds in the UK for over 40 years and is still considered to be one of the best pond liners on the market. … Butyl is much more heavy duty than PVC and is less likely to be damaged.

Are LDPE pond liners any good?

LDPE will fit give you a close-fitting and wrinkle-free pond base. Its tear-resistant material is guaranteed to provide you with a reliable pond liner that will require no maintenance. … While pond liners are very tough, any liner is in danger of being punctured from sharp stones in the ground.

Can you use a tarp as a pond liner?

While tarps are water resistant, they are not waterproof. A tarp used as a pond liner will begin to leak before a single season passes. … You can cut the bottom section to size and use it to line your garden pond for a few years of quiet enjoyment.

What is EPDM pond liner?

EPDM stands for Ethylene Propylene Diene Monomer. EPDM pond liners fall under the classification of flexible pond liners, meaning they can be manipulated into nearly any size and shape. Often, one sheet of EPDM rubber material will be big enough to meet your needs.

What is LDPE liner?

What are Low Density Polyethylene Liners? Low Density Polyethylene (LDPE) is actually a semi-rigid and translucent polymer. The container liners manufactured out of this polymer is referred to as low density polyethylene liners which is more popularly referred to as LDPE container liners.

What are the different types of pond liners?

  • Most Common Pond Liner Material: EPDM vs RPE. For most custom pond applications, we usually recommend one of two materials: EPDM Rubber or RPE (reinforced polyethylene). …
  • EPDM Rubber Liners. …
  • Reinforced Polyethylene Liners (RPE) …
  • Box Welded Polypropylene Liners.

How deep should a wildlife pond be?

The depth of a wildlife pond should be 24 to 36″, that’s 2ft to 3ft at its maximum depth. However, shallower areas of around 8″ to 12″ should be included for plants to root and push out of the surface. Consider building in a beached area for mammals that fall in to escape.

How much should a pond liner overlap?

Remember to factor in extra for the lip to anchor the liner over the edge of your pond – at least 2 feet/0.15m overlap to go around the entire rim of your pond.

How many fish can I put in my pond calculator?

The average recommended gallons per inch of fish is 10. To calculate how many inches of fish I can fit in my pond I would divide 1,000 by 10: 1,000/10 = 100. According to this calculation I can safely stock 100 total inches of fish in my pond.

Should I put sand under pond liner?

In our experience it is worth considering the application of sand as the first or base level of underlay for the pond liner. It will certainly do no harm and can be a useful substrate to level off any large deviancies in the ground. … You might end up with an underlay that attracts mold, bacteria and starts to smell.

Can I put a new pond liner over an old one?

It’s best to remove old and damaged liners before adding new layers, but it is possible in some cases to just place down a new liner over the old one. You’ll need to remove everything that’s in the pond first, including any rooted plants and sand or gravel spread over the bottom.

What kind of sand goes under a pond liner?

Put down the underlay and pond liner. Place the plant pots in the preformed indentations and line the pond with a layer of washed river sand (sharp sand).

Can you join HDPE pond liner?

Can you join pond liners together? The simple answer to this is yes, for the most part!

What is HDPE liner?

HDPE is a versatile material that is used widely across many applications. One of the primary uses of HDPE is as a liner at the base of landfills, where its chemical resistance is put to use. HDPE applications also include pond linings and water containment projects.

Is Pond liner safe for fish?

Fish friendly – PondGard pond liner is based on EPDM synthetic rubber, a highly flexible stable material that’s not only long lasting and easy to work with, but safe for fish and plant life.

Is PVC toxic to fish?

Something that is important to remember for all of these projects is that PVC pipe should be properly cleaned before being put in a fish tank. Dirt and germs on its surface could harm the habitat in your fish tank. Also, any stray PVC fragments that fall off the pipe could hurt your fish.