Summary: Learn how to install a flexible pond liner, calculate the size of a pond liner, dig a pond, fit a pond liner and fit a rigid pond liner.
There are two types of pond liner. A flexible pond liner will mould to the shape of the pond you have dug, allowing greater freedom in your pond design. A rigid liner is made from reinforced plastic and requires the hole to be dug to a specified size and shape.
Flexible liners are usually made from PVC or butyl rubber. When it comes to choosing a liner, remember that the cheaper the material, the shorter it lasts. As a guide, choose one with a long guarantee. High quality liners should last for 20 years.
To find a liner to fit your pond, you will need to work out the size of the pond. To do this, there are two calculations you need to perform.
To find the liner length:
Length = maximum overall pond length + (2 x maximum depth) + 300mm overlap around the edges
To find the liner width:
Width = maximum overall pond width + (2 x maximum depth) + 300mm overlap
The above formula is suitable for all ponds regardless of shape or size.
When you are ready to start work, the first thing you need to do is plan the shape of the pond.
Dig a series of steps descending to the bottom of the pond. Each step should be 300mm deep and 250-300mm wide.
After weighing down the corners of the liner with bricks, start filling the pond with water.
Rigid pond liners are sold in a variety of shapes. Because the hole you dig must be an accurate match for the liner, the installation will be easier if you choose a symmetrically shaped liner.
As the liner fills with water, backfill soil or sand into any gaps around the edges.
Bed each slab on top of the hardcore with the edges of the slabs overhanging the pond and tap each one into position, checking they are level.
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