EPDM Pond Liners

Comments (20)

EPDM Pond Liners have high expansion and contraction characteristics that enable it to conform to objects below the pond. Should earth movement occur, such as settling, EPDM's high elongation will enable it to stretch.

EPDM pond liners flexibility provides more versatility in the pond design. Unlike preformed liners, it can be easily shaped to fit the unique contours of the pond dimensions, allowing a more unique design.

EPDM Pond Liners stay flexible in temperatures from -40 Fahrenheit to 175 Fahrenheit making it easy to install year round. Unlike other liner materials, EPDM Pond Liners do not contain plasticizers that could make it become brittle with age and cause cracks or splits in the material, threatening aquatic life.

EPDM Pond Liners requires little or no regular maintenance once installed. Remarkable resistance to the harmful effects of ultraviolet radiation (UV), ozone and other environmental conditions.

45 mil EPDM liners have quickly become the industry standard; they are affordable, flexible enough to allow better fit, fairly resistant to UV, and often carry a 20 year manufacturer's warranty. Other liner materials, including butyl rubber and PVC may be less expensive, but are often harder to install and less durable. Also popular are small preformed plastic ponds which are quite durable, but not as easy to install as they would appear.
"Mil" simply refers to the thickness of the material, so the 45 mil would be thicker and therefore stronger (assuming the same material). 45 mil liners are also usually made of EPDM and carry a 20 year warranties, while 32 mil are made of lesser materials with shorter warraties.
An underliner protects the pond liner from puncture by sharp objects such as stones and roots. Failure to protect the pond liner from punctures may void its warranty. We offer an inexpensive commercial underliner; otherwise, a layer of sand, newspapers, old carpet or insulation could be applied.
Pre-formed ponds cannot be used free-standing. They need to be dug in and back-filled. The entire pond bottom and all plant shelves need to be well supported to eliminate the possibility of cracking.
Trees produce roots that might pierce the pond liner, and leaves and other debris that might fall into the pond. They also shade the pond, which may limit plant growth. Ponds may also inhibit tree growth by restricting root development. Ponds in low lying areas can be contaminated by runoff such as lawn fertilizers and weed killers, and possibly overflow.

Timothy Landford has been designing and building garden ponds for over 20 years. He is a garden pond enthusiast and has gained a wealth of experience since he started his hobby 20 years ago.

You can find out more about pond liners such as how to avoid the mistakes most people make when building their garden ponds and how to select the right pond liner from his following website click here


Alec 12.03.2010. 05:55

What should i use to seal my plywood tank? I am in the process of building a 450 gallon plywood tank. I am wondering what others think would be the best thing to seal it with? Also how would you go about sealing the sheet of glass. I have heard of aquarium safe epoxy, liquid rubber, and was thinking about epdm pond liner?


Admin 12.03.2010. 05:55

You use silicone on the glass. On the joints use silicone, fiberglass and then epoxy paint.


Ace V. 30.05.2011. 01:11

How do attach 2 pieces of pond liner together? The pond liner i have is 45mm EPDM, and the biggest size i could find isn't big enough. I was wondering if using a marine epoxy, and then putting roof tape over that would good enough. The roof is waterproof and the brand is Eternabond. The tape comes in 4" x 1' and 6" x 1'

Ace V.

Admin 30.05.2011. 01:11

Here are sites which have plans and advice:

ehow.com Ask your question in the search bar

gardenponds101.com They have a section on this question

skippysstuff website


mj 08.08.2007. 20:38

where can i get epdm pond liner? i am trying to find a website that has this liner for cheap. i dont want to spend a lot on it. i have a pond i am building that is 8' by 5' by 2' deep, so as i researched i will need about 10x15. if you dont know of a website that has this stuff for cheap what else could i use that would be pretty much the same thing? most websites ive found are $60 and up plus shipping. im looking to spend under that.

my pond is going to be for my ducks, do i dont want to spend too much.


Admin 08.08.2007. 20:38

Are you near a Home Depot or Lowe's? Home Depot may still have this item http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100030118. Lowes' website doesn't list their pond liners, but I bought my waterfall liner there. The prices are comparable to the one you mentioned in your question, but you don't have to pay shipping.

A caution regarding cheap pond liners: they puncture easily and become brittle in the sun. If your pond develops a leak, it can be incredibly frustrating trying to find and repair that leak.

What some pond owners do, and I would also use caution doing this, is use roofing liner. You must be sure the roofing liner isn't treated with any chemicals. My neighbor is a retired homebuilder and they built their pond using roofing liner.


dan van 15.02.2011. 04:22

Is it possible to melt two pieces of EPDM rubber pond liner together to keep water from leaking? I have tried just overlapping the liner and using the recommended adhesive tape but it would not stay together. This is the last problem I have with the water feature I built since the water keeps running underneath where they come together.

dan van

Admin 15.02.2011. 04:22

Contact Pondlady.com she is an expert on this subject.


Thomas Z 25.02.2009. 21:30

Where can I find blue pond liners? I can't find a single blue pond liner.
Are pool liners safe for ponds? I hear some raise the ph and I don't want that. Halp.

Thomas Z

Admin 25.02.2009. 21:30

try this web sight


Runner 15.08.2012. 20:31

What size pond liners do I need for 100 and 200 gallon ponds? One 100 gallon pond and one 200 gallon pond. I'm looking to buy two different liners unless its cheaper to buy one huge one and divide it.


Admin 15.08.2012. 20:31

It is sold by the square or linear foot, so no particular savings to dividing one piece. When it's sold by the linear foot, you will pay for 10 feet in width (if that is the width of the liner roll) regardless of how much you need.

Here is how you figure how big your liner needs to be.

Convert gallons to cubic feet. Decide how deep you want your pond. That gives you the square feet on the surface of your pond. Decide how long you want one side. Dividing the square footage by that number give you the length of the other. (The closer to a square you make the pond, the less liner you will need.)

Here is an example.

100 gallons = 14 cubic feet. Two feet is a popular pond depth. 14 divided by 2 = 7 square feet. If you make the pond 3 feet across, then the other way across would be 7/3, or 2 feet, 4 inches. Because you need to lap around a flagstone or brick and then over it to be secured by an edging, you need to add at least two feet to the liner. so for a 100 gallon pond, 3 feet by 2 feet four inches, and two feet deep, you would need a liner 9 feet by 8 feet four inches.

Another example.

200 gallons = 28 cubic feet. Divide by two feet depth. 14 square feet. Make a square pond this time. The square root of 14 = 3 feet, 9 inches. The liner would be 9 feet 9 inches square,

Make that same pond deeper. 200 gallons = 28 cubic feet. Divide by three feet depth. 9.33 square feet.
The square root of 9.33 = just over 3 feet. The liner would be 11 feet 1 inch square. Because the square footage of the pond surface is important for pond fish capacity, this tank would not support quite as many fish as the shallower one.

Notice what would happen if you added just a foot or two in any direction to your liner. The liner cost would only go up proportionately, but the pond volume would go up faster. This means a liner in a small pond is inefficient. The smaller the pond, the more of the liner goes in proportion just to cover the walls and do the flip that protects the liner from exposure to sun and the elements.

Rigid ponds can be a better buy in the tiny pond category. One that can sit above ground makes installation much easier.

Here is one company that sells liners.


Their smallest size liner is 10" by 8",

instead of cutting one liner in half you could calculate the size of a 300 gallon pond, line it saving six feet of liner in two directions, and then divide the pond with a row of hollow cinder blocks topped by rocks matching the edging, into two "separate" ponds, that you would again save on by being able to use the same filter on both.


mj 19.07.2007. 23:21

where can i buy some cheap "rubber pond liner"? or what could i use that is cheaper but basically the same thing? i am going to start builting a fish pond in my yard... i was looking at some pictures online... they have "rubber pond liner" lining their ponds. i looked on ebay and the prices on there were expensive. anyone know of any places online or in stores that i could get this stuff cheaper? i have some kois already but there in one or those smaller plastic kio ponds. i want to make them a larger home.

any ideas? please help me out


Admin 19.07.2007. 23:21

I have two ponds made with different liners. My first was a 1500 gal. made with scrap and recycled EPDM rubber from a roofing contractor. It needed pressure washing and a few patches but it was free. The second 2500 gal. was made with a one half of a new PVC nylon pit liner from the oil rigs around here. A friend "borrowed" one from work and is letting me "borrow it" in exchange for helping him install the other half we "borrowed". If your ethically and morally opposed to "borrowing" you could go out to an oil patch and buy a piece. If it's too expensive they would probably give you a liner when they finish drilling. They usually burn and bury them. RScott


mandy 18.03.2007. 21:52

Ins and outs of koi pond setup? My dad is on a "let's make the yard pretty" kick, and a koi pond has weedled it's way into the picture. Problem is that we have NO idea of even where to start.

Should we get one f those plastic ponds or a pond liner? How big would it need to be to support half a dozen koi?

What do we need to know before we really get started?

And, a big important question, where do quality koi come from? I don't THINK the petstore would have them, and if hey did I deffinantly don't think they'd be very healthy.


Admin 18.03.2007. 21:52

Go with a pond liner. They are easier to use and last longer, especially if you live in a climate with temperature extremes (the UV rays and freezing, etc., can damage the rigid plastic over time - EPDM liners rarely have that problem).

You will need to use an underlayment to keep the liner from getting punctured by tree roots and rocks and things. You can buy it, or use a thick (4"+) layer of sand, or, my personal favorite, carpet pad.

I personally think free-form shapes look better than perfect circles or rectangles, but that's up to you. You can experiment with the shape by laying your garden hose out in the approximate dimensions of your pond. You will probably err on the side of too small - I read something somewhere once that said most pond owners wish they would have made their pond larger within a year or two of putting one in (happened to me - we started with 500 gallons for our first one, then went up to 3,000 a year later!).

Once you're satisfied with the size and shape, dig your hole, put down your underlayment, and put the liner down on top. It helps to let it warm up in the sun first - the warmth makes it more pliable. Start filling it up with water (use culinary water - irrigation water has all kinds of bugs and critters in it that can ultimately cause sickness and injury to your fish). Smooth out the liner as it fills, trying to avoid as many folds, wrinkles, etc., as possible.

DO NOT USE A SUMP PUMP. They have the power to move water OK, but they are filled with oil. If you have a pump go out, or a seal crack, or whatever, your pond will be filled with oil, too, and it will kill everything - plants, fish, beneficial bacteria, etc. - you have. Splurge on a good filter system and a pump made for ponds. When in doubt as to size, type, etc., over-filtration is always best. Maintaining good water quality is the secret to maintaining healthy fish.

You can order koi over the internet - just "google" koi and you will find dozens of suppliers, of all sizes and colors. They can be expensive, however. Lots of garden centers and nurseries now carry koi, as well, and they can be higher quality than what you would find in a pet store but not exorbitantly priced like show koi via the internet. It's a good "medium" place to start.

I hope you guys enjoy your new koi pond. I love mine! Koi have so much more personality than goldfish, and are so much smarter - I would never go back to keeping goldfish after keeping koi for the last five years.

One last thing - check out www.koivet.com. It's the best resource I have found for answering questions about the general care of koi.

Hope this helps!


Big-Help 12.11.2007. 07:45

What can i dot to make my pond hold water ? and what to do for the pond floor? I have a pond but i cant think of something that will hold the water. i currently have a waterproof tarp thing but im sure that wont last very long, also what can i put in the bottom of it. I tryed to put sand but it makes the water go very blury and you cant see the bottom, even after i wash it many times.


Admin 12.11.2007. 07:45

You forgot one very important part of the question. Is it made of:
1. dirt pond
2.clay pond
3.pond liner/such as EPDM or Xavan
5. if it's a garden pond with a liner do you have a geotextile underlayment?

You have had several answers all of which dosen't indicate that these considerations were thought of.

Suggestions and links of products you can use for any type of pond.
( # 's1. & 2. ) bentonite clay called Pond Sealer.
for dirt bottom ponds

#3.pond liners/or new liner
Black Foam / Seam Tape
#4. concrete
Suggestions/store Lowes
Quikrete 10 Lb. Vinyl Concrete Patch
Item # 137822
Model # 1133-11
Quikrete Quart Concrete Bonding Adhesive
Item # 10427
Model # 14420

#5. geotextile underlayment
(if it doesn't say geotextile I won't buy it.)

Of course all of these ponds will have to be drained if they are small garden ponds with liners or made from concrete to do the repair.
Luck you if it's a dirt pond I don't think you have to empy it just put the bentonite clay in it and wait for it to settle.
My hobby is a small garden pond and relatives own landscaping business. I get gets lots of info and know all the best places for prices.
Good Luck to you.


kay 27.07.2009. 15:45

How do you build a pond? How do you build a pond, we have already dug a hole and laid down like this tarp stuff and put rocks surrounding it, but do you need a pump? How do you keep the water clean? We would like to out fish in it so any ideas on that too?
I meant we would like to put fish in the pond as well!


Admin 27.07.2009. 15:45

If you actually put a tarp in it it will deteriorate very quickly.
Yes you should use EPDM pond liner, with a geotextile underlayment to prevent critters from burrowing under the liner and to protect the liner from dislodged stones,you need a pump, a skimmer if it's a large pond, and having a UV biological filter will keep the water clear. I have koi, goldfish, shebunkins and 2 perch . They get along nicely.
The link below will give you an idea of the things you'll need they are the pond kits that come with everything.
The link below is the home page.
Don't use news papers, roofing felt or rugs as underlayment because they decompose quickly leaving the liner without protection.
Geotextile underlayment this has a 20 to 25 year life expectancy.
Good Luck enjoy your pond.
EDITED: #1 research the job before you finish it
#2. If you put koi in the pond you'll need a oxygenator because they use more oxygen.
Koi need a lot of oxygen, almost as much as we do when resting.


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