Pond Liners

How do I determine the size of a pond liner?

See the Pond Liner Estimator on our website. It will give you instructions.

On site measurement for a pond that is empty round or rectangular:

Using a soft tape measure, anchor the tape 2-4 feet outside of the other side of the longest length of the pond until you are a few feet out of the pond. Using the same method, measure the pond's width at its widest point. Multiply the length x width to get the total square footage of the liner.

On site measurement for a pond that is full of water or partially full is more difficult:

If you know the depth of the pond you can double the depth and add it to the length and width. Be sure to start 2-4 feet outside of the pond for anchoring the liner.

Do I need underlayment (Geotextile) to protect my liner?

If you are going to be lining your pond with reinforced polyethylene, the answer is no, not usually, unless there are sharp rocks / gravel in the soil under your liner.

It is easier and often less expensive to use Geotextile than to bring in sand and spread it out before lining the pond.

Reinforced Polyethylene is the most puncture resistant liner material available. If you are using EPDM rubber to line your pond, you should always use Geotextile or at least six inches of sand under the liner. EPDM rubber is a soft, pliable material that works well for landscape ponds or waterways, but it punctures easily.

Which liner is the most flexible?

EPDM rubber will hold well to the contours of your pond, especially if it has an irregular shape. It also looks most natural. The thinnest reinforced polyethylene liners (20 or 24 mil) are also quite flexible and have been used for decorative ponds.

Which liner material is most puncture and tear resistant?

Reinforced Polyethylene is several times stronger than heavier EPDM rubber or HDPE (high density polyethylene) liners. It is also extremely durable and long lasting and by far the most puncture and tear resistant. In most cases reinforced poly does not require underlayment, but should it tear or rip, the manufacturer recommends our Reinforced Polyethylene Repair Tape.

Do you install the pond liners you sell?

We do not provide an installation service, but we have videos to show how installation is done. Installation is fairly straight forward, the main key is to be sure you have enough people on site to assist.

Briefly, how is a large liner installed?

The liner roll will be marked (typically on the roll itself and on the exterior wrapper) with the length, width, and directional arrows for deployment. First, unroll the liner in the direction indicated by the first number and arrow on the roll itself. The second number shown is the unfolding direction. In theory the liner can be placed in any of the four "corners" outside of the excavation. Which corner to start at is influenced by the space available, and any obstructions that may be present. Usually the liner is unrolled length-wise and then pulled down across the width of the pond and up the other side.

How big can one piece of reinforced polyethylene pond liner be before you'll need to seam it?

The maximum size of a liner depends upon the mil thickness of the material you've chosen, here are the maximum sizes for a one piece reinforced polyethylene liner: 20 mil - 100,000 square feet = 7,500 lbs 24 mil - 75,000 square feet = 7,125 lbs 30 mil - 80,000 square feet = 10,800 lbs 40 mil - 40,000 square feet = 5,520 lbs

What exactly is EPDM rubber liner material?

EPDM is an acronym for ethylene propylene diene monomer, a flexible synthetic rubber that is manufactured by Firestone.

How long will EPDM rubber liner last?

Firestone warrants our 45 mil EPDM rubber liners for 20 years. Their studies indicate it will decay about 1/2 mil per year in direct sunlight.

Can EPDM rubber liners be used in a potable (drinkable) water situation?

EPDM rubber is fish safe but is not labeled NSF approved for drinking water.

When seaming an EPDM rubber liner, what is the correct way to apply primer in preparation for the seam tape installation?

Always wear gloves. After cleaning and buffing the EPDM rubber, apply the primer and wait until it is no longer tacky and does not "string" when touched with a finger before applying seam tape. Apply the tape evenly making sure there are no bubbles. Lay the overlapping EPDM rubber material or patch over the tape. Use a roller or your hand to smooth the tape.

What makes our reinforced polyethylene liners better than other liners?

Our liners are much stronger (much better puncture and tear strength), lighter weight, offer excellent UV resistance, and are less expensive than most of our competition. Our PDB40 liner's 1200+ PSI puncture strength is the highest we are aware of for any product even remotely close in its price range and the need for an underlayment has been virtually eliminated.

Can I get pond liners sent out to me?

Yes, please contact us by live chat on the website, emailing in to, or call us at 1-800-522-3747 to request samples.

How long does it take for a RPE pond liner to arrive after ordering?

Once the order has placed, it will take between 2-3 business days to have the liner cut to your specifications, and then depending on where you are located, shipping time can take between 2-7 business days. Tracking information will be available once the liner has shipped.