EPDM Pond Liner (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane widely used around the world for lining ponds, water gardens, streams and waterfalls, and other water features. Known for its durability and flexibility, EPDM liners (most commonly found in 45mil thickness) are a top choice for both professional pond builders and DIY enthusiasts. Below, we’ll explore the key pros and cons of using EPDM liners for your water feature project.
Pros of EPDM Pond Liners
1. Strength and Durability EPDM pond liners are exceptionally strong and can withstand a significant amount of weight and pressure. This makes them ideal for larger ponds as they won’t sag or stretch under the weight of the rocks and water. Additionally, the material is highly puncture-resistant, which means it can handle rough terrain and sharp objects without tearing easily. While 20mil thickness can be cheaper, we recommend 45mil thickness as the best thickness to creating a lasting water feature with peace-of-mind.
2. UV Resistance Unlike some other pond liners, EPDM is highly resistant to ultraviolet (UV) rays. EPDM is the same material used to roof some flat-topped buildings, which gets constantly battered by harsh UV rays. Being resistant means that exposure to sunlight won’t cause it to degrade over time, making it a great choice for ponds located in sunny areas. Its resistance to UV damage ensures a long-lasting liner that can handle years of exposure without becoming brittle or cracking. To protect the liner even more from UV rays and significantly extend the lifespan, we layer rocks and gravel so prevent these damaging UV rays altogther.
5. Temperature Resistance Similar to their ability to withstand harsh UV rays, EPDM liners are also known for their ability to withstand a wide range of temperatures. They are resistant to cracking in freezing temperatures and can handle heat without becoming too soft or losing their shape. This makes them an ideal choice for ponds in regions with extreme weather conditions, such as Minnesota. Any sort of rigid pond liner such as concrete or brick can quickly become unstable with our regular freeze and thaw cycles and leak through the resulting cracks.
3. Easy Installation EPDM liners are relatively easy to install, even for DIY pond builders. Thanks to their flexibility, they can be easily molded to fit the contours of your pond, including any curves, corners, and ledges you may design into your feature. The material is very forgiving and manageable, making installation straightforward, even for beginners. This is very helpful aspect compared to solid pre-formed liners that require a specific shape and leveling to occur in order to sit correctly.
4. Long Lifespan With proper installation and care, EPDM pond liners can last for over 30 years. This long lifespan makes them an excellent investment for pond owners who want a durable solution that won’t need frequent replacement. Additionally, careful DIYers on a budget are often able to reuse their old liner if they decide to change the shape or layout within a few years of the first installation due to this impressive lifespan.
6. Safe for Wildlife EPDM pond liners are nontoxic, meaning they are safe for any fish, plants, and other wildlife that may inhabit your pond. You don’t need to worry about chemicals leaching into the water, making this a safe option for ecosystems. Some other liner materials may need more prep and curing agents to make safe for your fish and local wildlife interacting with your water feature. Also, be aware that while pond EPDM liner and roofing EPDM liner may be the same exact materials, roofing EPDM often comes with an additional chemical coating over top that can be fatal to plants and animals if not completely scrubbed off.
Cons of EPDM Pond Liners
1. Higher Cost One of the primary disadvantages of EPDM pond liners is the cost. Even though the proverb “you get what you pay for” may be very applicable here, it can still be a bit much for some. As one of the more expensive types of pond liners, it may not fit everyone’s budget. While it offers great long-term value, the upfront investment may be steep for some homeowners or DIYers looking for a more temporary solution.
2. Heavy and Bulky Due to its durable thickness, EPDM pond liners are quite heavy, which can make shipping and handling more difficult than other thinner materials. The added weight not only raises shipping costs if ordering online but can also make the liner harder to maneuver during larger water feature installations. For cost savings, it’s a good idea to try and source EPDM locally from a pond supply or landscape supply if possible to avoid high shipping fees.
3. Dark Color Conceals Fish For the DIYer choosing an unprotected liner, the black color of EPDM can make it more difficult to see their fish, especially in deeper water. Koi and other brightly colored fish may blend into the darker background, reducing their visibility from above.
4. Requires Protection Though EPDM is extremely durable, it’s still a good idea to cover the liner with rocks and gravel for additional protection. This not only shields the liner from UV rays, potential punctures or tears but also enhances the natural beauty of the pond by covering the exposed liner, giving your water feature a more integrated look. If choosing to go with a bare liner, also be aware that EPDM can be extremely slippery when wet in case you need to step into your pond for any cleaning or maintenance.
Conclusion
EPDM pond liners are a highly durable and versatile option for lining ponds, especially in our regions of the country like Minnesota, where extreme temperatures can challenge other materials. While they may come with a higher price tag and be a bit bulky to handle, their long-term durability, flexibility, and UV resistance make them an excellent investment for anyone serious about building a lasting, beautiful pond. When combined with protective measures like covering the liner with rocks and gravel, EPDM can help create a stunning and resilient water feature that will bring you years of enjoyment.