Pond liners are made of impermeable materials designed to retain water. An additional layer of protective lining is recommended to form a barrier between the soil of the dug out and the pond liner to resist damage from sharp edged stones and rocks, which may be pushed up over time due to ground movement. To get the most use from your pond liner you must select it correctly, install it properly and provide maintenance over its lifetime.
Here are a few common mistakes to avoid when buying and installing a pond liner:
- Guided by price alone: Pick a liner that is thick enough to resistant puncturing, one that is not likely to deteriorate when exposed to the sunlight and one that is strong enough to line a pond for many years. It is worth spending a little more upfront to avoid problems later. Plastic liners are not as durable as rubber liners such as Butyl or Epalyn. The best choice for a garden pond would be a 0.75mm thick EPDM (Epalyn) liner.
- Ordering the incorrect size pond liner: Once you have dug the hole, measure it accurately in three directions – the length, the breadth and the depth. Then go online to put these figures into a pond liner size calculator to get the exact dimensions to order. Remember to factor in extra needed to anchor the liner over the edge of your pond – at least 2 feet/0.15m overlap to go around the entire rim of the pond.
- Not adding a protective underlay to your order: A pond liner needs to be protected ideally from above and below. If no protection is added by way of lining your pond with a geotextile protective underlay before installing the pond liner, it may tear resulting in water seeping out.
- Failure to secure the edges of the liner: When installing the liner, generously overlap the edges to make sure your pond is water tight. If the overlap is insufficient, the sides of the pond will become exposed as you start to fill your pond with water. The overlap must then be secured in place with your choice of edging material.
Avoid these mistakes to ensure you create your dream garden pond that will give years of pleasure.