Pond Liners
Flexible, long-lasting pond liner sheets for permanent seals and leak-proof ponds
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Unless you are using a moulded-plastic formed pond or are digging or excavating a large natural earth plond in blue clay then you will liekly need to use a pond liner. A pond liner is basically a resistant and water-tight membrane that keeps the water in your pond. Pond liners can be the most expensive piece of the initial pond build so make sure you measure twice and order once because the planning of your pond is the key to sucess!

After you have done the initial layout of your pond and maybe even after you have sharpened your shovels and started digging the shape of your pond out of the front lawn you should stop and do some simple calculations to figure the size of the liner you will need. Establish the size of the liner before going to afr in to your planning as the importance of correct sizing when using a membrane cannot be overstated. When a liner is costing over $1.50 per square foot you want to be very carefull before you order the sheet of EPDM that is 380 square feet only to discover you needed a peice that is 780 square feet! I've been there and it's a long way back!!


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So we'll assume that you will be requiring a pond liner which is also called a membrane. Smaller basins and backyard ponds only require a lightweight material. We use a PVC, polyvinyl chlorine, membrane that will resist frost and ultra-violet light. Sunlight will damage cheap materials so it is best to ensure your membrane has this protective feature, most do but you should ask your supplier. Most 20 mil membrane should cost around $1 per square foot and can be bought in standard sized rolls or get a custom size piece cut at your local garden supply store as most such retailers carry this and the 35 mil liner that is slightly thicker and can buy for $1.50 per foot. The 20 mil and 35 mil materials should come with a 20 year warranty if you place a geo-textile protective barrier under and on top of the liner. There is a 45 mil EPDM, ethylene-propylene-diene-terpolymer, heavy -duty membrane that is available and we often use this strong and puncture resistant material for waterfalls and streams between two basins. It can cost from $0.80 - $1.50 per square foot. Using a thicker material will reduce the risk of a breech or puncture which could result in you're fixing a leaky pond. Luckily, these membranes can be repaired and sealing foam is available to help with sealing a pond.

Discount Pond Liners Cheap 45 ML EPDM POND LINER Ideal for most backyard ponds, the Firestone® PondGard 45-mil EPDM liner is the liner of choice. Extremely flexible, it is easy to work with and will stretch to conform to a pond's features. It is completely UV-resistant and will hold up well in direct sunlight. Carries a Firestone® 20-year warranty. Ships motor freight. Prices include delivery within the USA . 10' x 15' Liner - $175 150 square feet Includes Delivery 10' x 20' Liner - $199 200 square feet Includes Delivery 15' x 20' Liner - $299 300 square feet Includes Delivery 20' x 30' Liner - $449 600 square feet Includes Delivery 25' x 30' Liner - $599 750 square feet Includes Delivery 30' x 30' Liner - $770 900 square feet Includes Delivery Contact us for custom size liner and membrane inquiries. PRO-GRADE 45 ML EPDM POND LINER When Quality Comes Before Price Pond Liner by SweetH20® are made of fish-grade synthetic rubber (ethylene propylene diene monomer). When used as a liner for tanks or ponds, their stretchability will be appreciated. They are heavier and more user-friendly than either PVC or polyethylene liners. Vulcanized seams are guaranteed for the life of the liner. Sold in flat sheets only. The surface of the liner has been dusted with talc to improve handling and storage, so be sure to rinse thoroughly before adding fish. The actual weight is approximately 30 lbs per 100 ft². All liners ship direct from the factory. All dimensions ±4". Made in USA. Ships motor freight. Prices include delivery within the USA . 10' x 50' Pro 45 ML Liner - $650 500 square feet Includes Delivery 15' x 50' Pro 45 ML Liner - $950 750 square feet Includes Delivery 20' x 50' Pro 45 ML Liner - $1150 1,000 square feet Includes Delivery 25' x 50' Pro 45 ML Liner - $1300 1,250 square feet Includes Delivery 30' x 50' Pro 45 ML Liner - $1400 1,500 square feet Includes Delivery 40' x 50' Pro 45 ML Liner - $1650 2,000 square feet Includes Delivery 50' x 50' Pro 45 ML Liner - $1800 2,500 square feet Includes Delivery Contact us for custom size liner and membrane inquiries on 100 foot widths. Secure Shopping with Credit Card or Paypal® using the Secure Servers of Paypal®

Calculating pond liner size
Many beginners take measurements from their outline and do some rough calculations and then scurry off to the pond supply store with such enthusiasm only to come home with a specially-cut length of material to find that it is too small.

There is a simple formula to help calculate the dimensions of the pond liner you'll need.

Width - The formula to determine the width of your membrane is 2 x pond depth + pond width + 2 feet = required width.
Length - The formula to determine the length of your membrane is 2 x pond depth + pond length + 2 feet = required length. .

Example: If you have a 20 foot long x 10 foot wide pond that is 6 feet deep at the deepest point, the calculation would look like this:

20 (width) + 6 (depth) + 6 (depth) + 2 (overlap) = 34 feet in length minimum membrane liner width size required according to the pond liner calculator.
10 (length) + 6 (depth) + 6 (depth) + 2 (overlap) = 24 feet in width minimum membrane liner width size required according to the pond liner calculator.

In this example you would need a liner at least 34' x 24'...unless you have a custom cutting facility nearby you may need to puy a standard sized roll. Many manufacturers offer standard rolls of 45 MIL, 30 MIL and 20 MIL liner at low-cost. Remember it can be much cheaper to modify your pond plans to accomodate a standard liner roll size. In the above example a 30 foot by 30 foot liner can be bought for 15% less than a 34 foot by 24 foot custom piece! Be flexible...that's what pond life is all about!

Don't forget to add whatever you will need to cover the waterfall spillway if your design calls for that. You can use scrap or leftover pieces for this, but just be sure you have enough left to do the job you've intended. As my Bass fishing buddy Jared said to me one day as we drifted into the shoreline reeds, pond liner is a bit like Budweiser...it's better to have a bit left at the end of the game instead of running out before the end of the fourth quarter!