Garden pond liners.
There are numerous ways of creating a pond in the garden. Some methods involve molding concrete to form your own shaped pond or installing a rigid pond liner. By far the easiest method is to use a flexible pond liner as it gives you complete control over the size and depth of the pond.
The different types of pond liner
Concrete
Concrete liners can make a decent waterproof lining if laid correctly. The disadvantages of using concrete are that it can crack due to movement in the ground and frost damage. A concrete liner is also very labour intensive to install compared to other methods of pond construction.
Rigid pond liners
These are often made from glass fibre (GRP) or vacuum pressed plastic. These liners are resistant to frost damage and are not punctured easily. Rigid liners do require a hole dug to the exact dimensions of the liner so they're not as easy to install as the flexible liners. You are also limited by the available sizes and shapes.
Flexible pond liners
Waterproof flexible liners are by far the easiest option because they offer complete freedom when it comes to the shape and depth of the pond.
Flexible liners are available in a range of different sizes and materials including PVC, synthetic butyl rubber and low density polyethylene (LDPE). The best choice is LDPE as it provides excellent resistance to tearing and has an extremely long life-span. Make sure you install an underlay before you put down the liner.