Choosing Between Rigid and Flexible Pond Liners for Your Garden Pond

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When you are building a pond for your garden, you will want to line it with a pond liner. Without a liner, once the pond is filled with water, it will slowly seep into the ground until your pond is empty. When you start searching for pond liners, you will find they are made from several different materials, but they are available in two basic types, flexible or rigid pond liners.

Rigid Pond Liners

Rigid, or performed, pond liners come in several sizes, shapes and depths. They are made with three types of materials:

  • Fibreglass
  • Plastic
  • Flexible liners that are box-welded into shape.

While plastic liners are less expensive than either fibreglass or box-welded liners, they must be inserted into the ground to keep the liner from flexing with the weight of the water. If they flex, they can crack and the liner will be useless. The other liners can be concealed by putting them into the ground or they can stay above ground and you can use plants to hide them.

One of the biggest disadvantages to rigid liners is they can often be too shallow to house fish because the water temperature cannot be controlled. If the liner is too shallow and sets in the sun for most of the day, the water can become too hot for the fish, causing them to die.

Flexible Pond Liners

With a flexible pond liner, you have many more options. You can create the shape and size of the pond that you want due to the liner’s flexibility. You can dig the pond as deep as you wish if you are stocking it with fish and plants. Water Garden’s fish pond liners are also durable and many of them can last up to 25 years if necessary.

To ensure your liner does last, you will also need to purchase an underlayment material to cover the freshly dug pond. The underlayment protects the pond liner from any rocks or tree roots that may be in the bottom of the pond. You don’t necessarily have to buy a commercial underlayment as they can be created from sand, carpet or other materials too.

Flexible pond liners are made from several materials, including:

  • PVC
  • Rubber
  • Butyl
  • EDPM

PVC is probably the least expensive pond liner that you can buy, but they are more suited to smaller ponds as they can easily break down if they are exposed to sunlight. If you are going to have a pond that gets sun exposure for most of the day, then EDPM or butyl liners are best as they are two of the most durable types of liners.

You can easily install a flexible pond liner yourself, as well as the underlayment. They just have to be unfolded to fit the pond and you can press them down by walking over them with soft soled shoes, such as trainers. Once they are set in place, you can then add water and start stocking the pond with fish and plants.

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