Asked by: Fouad Quenzel
pets fish and aquariums

How thick does a pond liner need to be?

Last Updated: 1st May, 2020

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What thickness of pond liner do I need? 1.00mm recommended for all box-welded pond liners fabricated for ornamental regular shaped ponds and flat sheet lined ponds where overlay protection is not suitable, but extra durability is required due to the type of planting, size of pond and exposure to visiting wildlife.

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Hereof, how thick are pond liners?

For larger ponds with rubber liners, 40 ml and even 45 ml will work well and last for years. Synthetic plastic liners are usually sold in 20-40 mil thicknesses for home use. 40 is better but 20 or 30 may be just fine in some instances.

Subsequently, question is, how long do pond liners last? 20 years

Then, what pond liner should I use?

The most common types of liners for garden ponds are PVC and rubber pond liners such as Epalyn (EPDM) and Butyl. Overall, we would recommend a pond liner made of rubber, which is durable, flexible, moderately inexpensive and easy to work with because they last for decades.

What is a pond liner made of?

Today, pond liners made of reinforced polyethylene (RPE), ethylene propylene diene monomer (EPDM), and high-density polyethylene (HDPE) are available.

Related Question Answers

Nahida Movshovich

Professional

Can you use a tarp as a pond liner?

Pond Liners
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.

Chun O'Connell

Professional

Is a 20 mil pond liner good?

100' Wide 20 Mil Polyethylene Pond Liners
Large ponds require a pond liner that is safe for fish and plant life, inexpensive, easy to install, and durable enough to last twenty years plus.

Abdelhamed Bujo

Professional

How much does a large pond liner cost?

Costs by Material
Liner Material Cost per Square Foot Cost for 12x12 Pond
EPDM $0.85 $122
PVC $0.65 $93
Spray-In $2.60 $374
Polyurea $1.50 $216

Isaac Kerekes

Explainer

What is pond underlayment?

Pond Underlayment. Pond underlayment fabric provides dependable protection for your your pond liner against sharp objects in the ground which can puncture rubber or pvc pond liner. This will act as a cushion between the heavy rocks and the easily punctured pond liner.

Haron Diarra

Explainer

How much is a pond liner?

The size of pond liner required can be calculated as: Maximum length + (2 x maximum depth of pond) x maximum width + (2 x maximum depth) with the overlay added into the length and width pond measurements. Or, take each measurement and use a pond liner calculator to do the calculation for you.

Aristide Lapuerta

Explainer

Can tarps hold water?

Water resistant tarps can withstand the entry of water into the fabric for a short period of time while waterproof tarps offer complete protection from water or moisture. Waterproof products can be taken under water (submerged) and will maintain impermeability, but resistant products cannot.

Stanel Buschler

Pundit

How do I measure my pond liner?

The formula for determining pond liner size is simple:
  1. Overlap + Depth + Width + Depth + Overlap = TOTAL.
  2. Overlap + Depth + Length + Depth + Overlap = TOTAL.
  3. Metric - 0.6 + Depth +Width + Depth + 0.6 = TOTAL.
  4. Metric - 0.6 + Depth + Length + Depth + 0.6 = TOTAL.
  5. Imperial - 2 + Depth + Width + Depth + 2 = TOTAL.

Btissam Descher

Pundit

Is PVC pond liner safe for fish?

PVC (Polyvinyl Chloride): A highly flexible product, it is safe for plants and fish. Most PVC liners are not UV resistant and must be covered with one foot of soil to prevent degradation. With an average lifespan of 10 years, PVC liners have a history of cracking in cold temperatures.

Maria Callsen

Pundit

Why are pond liners black?

A black liner will absorb light and heat, and creates the illusion of depth in the pond. Fish also show up better in a black lined pond. Polyex liners are black/brown reversible, the brown side is usually used to create a more natural looking pond.

Maysaa Talmach

Pundit

Do I need underlayment for pond liner?

Pond liner underlayment is required when using certain materials such as EPDM and PVC. Of all of the materials considered, EPDM is the least puncture resistant, which contributes to the need for a pond liner underlayment. PVC liners are more puncture resistance than EPDM, but nearly as much as RPE and RPP liners.

Henar Vyazmitinov

Teacher

How much does it cost to dig a 1 acre pond?

The average backyard pond is between 200 and 300 square feet. Since the typical price per square foot is $2.50 to $7.15, most people pay between $500 and $2,145.

Per Square Foot & Acre Cost Calculator.
Size Size in Square Feet Average Expense to Dig
1 Acre 43,560 $3,000-$5,000
3 Acres 130,680 $9,000-$15,000

Javad Kuchenbecker

Teacher

Kamelia Holmogortsev

Reviewer

Can you join pond liners together?

Joining EPDM rubber pond liner may seem like a difficult task, but with some planning and patience you can join two pond liners together with a leak-free seam quite easily. Position the second piece of EPDM rubber liner on top of the first and overlap the edge by 5”.

Jennine Beneitez

Reviewer

Will tree roots grow through pond liner?

The liner acts as a barrier to hold in water and keep out soil and tree roots that might harm the health of the pond. Roots growing under the soil beneath your pond may eventually work their way up and puncture your pond liner, causing leaks and problems for pond life such as fish and specialized plants.

Dilson Heidges

Reviewer

What can I use instead of a pond liner?

We have also made a list of pond underlays that are cheap and readily available.
  1. Pond Liner Alternatives to Use. Polyethylene Pond Liner. Tarp. PVC Liners. Lime and Clay Cover. Bentonite Sealing. Polypropylene Pond Liner. Waterbed Liner.
  2. Pond Liner Underlays Materials.

Kiara Sabat

Supporter

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

Fortunately, you can replace them without rebuilding the entire pond, though you will have to remove everything inside the pond temporarily. The old liner is one thing you usually do not have to remove and can add a layer of protection for the new liner.

Kelia Rujas

Supporter

Should you put gravel in pond?

Adding gravel to the bottom of your water garden can help create a more natural appearance than the plain black plastic or rubber liner you are looking at now. The small stones create an excellent source of surface area for beneficial bacteria such as Pond Logic® Muck Defense® to colonize and filter your pond water.

Aurelijus Gilow

Supporter

Will Leaves in pond harm fish?

However, if you have goldfish and koi carp in your pond a large amount of decomposing leaves and debris can cause all sorts of problems, especially over winter. Leaves that become waterlogged and sink will slowly decompose on the bottom of the pond floor as beneficial pond bacteria break them down.

Matei Isidorena

Beginner

Which side of a pond liner goes up?

The liner is laid directly on top of the underlay and pulled so it is taut. when laying the liner across the pond, make sure that the liner rests on the bottom, walls and shelf edges.