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Pond Underlayment

48 reviews

Product Weighs: 3.0 lb

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Add extra protection and peace of mind to your pond, your investment.

  • Increases pond liner life and is quick and easy to install.
  • Protects from sharp objects and prevents ground under liner from over-stretching. 
  • Made from 100% polypropylene non-woven material, will not mildew and is resistant to damage from insects and rodents. 
  • Material weight: 7oz


*Width is always 15ft wide. Pieces can be overlapped and come cut to help with placing. 

How to Determine the Size Underlayment You Should Buy:

1.) Determine the total sq ft of your pond liner: Example 20'x30' = 600 sq ft

2.) Divide the total sq ft of your liner by 15 (this is the width of the rolls they come on): Example 600 sq ft / 15 = 40 

Example: You would need to purchase a 15'x40' underlayment 

Customer Reviews
5.0 Based on 48 Reviews
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Matthew H.
United States United States
The underlayment is impressive

So I bought the pond liner because they recommended it- didn't know if it would be worth it or not but wasn't a terrible amount of money. Boy it was an impressive product. It felt almost as thick as craft store felt, but made from some type of polypropylene or similar. I first tried to cut it with a brand new utility knife and couldn't get the blade in (yay, though it led to a brief panic), oddly cut perfectly fine with scissors.

Rich B.
United States United States

Great experience working with JustPondLiners. Liner and underlayment of excellent material and quality.

Karen S.
United States United States
It's working great!

We are using the underlayment and liner to line a concrete watering trough that we haven't been able to repair. So far, the trough is full and holding water. We are very pleased. Thanks for the pre-purchase advice and prompt shipping.

John J.
United States United States
Pond underlayment

The underlayment works great. Just Pond Liners is easy to work with.

Jeremiah C.
United States United States
Just like they said

Of course it's heavy, so hard to move n such, but it was folded nice as was the underlayment, the whole process went smooth with 1 adult and 2 kids helping spread it out !