Our different styles of pond liners require different measurement techniques to both quote and manufacture. Here we detail these different techniques and other options for helping us manufacture your liner faster.

Flat Sheet Liners

The size of the liner required, regardless of shape, position, or size of marginal shelves, is calculated as follows.

The length is determined by the overall length plus twice the maximum depth. The width is determined by the overall width plus twice the maximum depth. It is advisable to add 200mm to both the length and the width for edge anchoring.

For example: A pond with overall dimensions of 2.4m x 2m and a depth of 450mm will require a liner of 3.5m x 3.1m. A pool can be of any shape to fit an overall dimension of 2.4m x 2m and a maximum depth of 450mm.

Composite Liners

Composite liners can be measured in two ways. A basic composite liner can be simply made up of flat sheet liners joined together at any position you choose. More complicated designs such as large kidney shapes or where there is an island in the pond require a totally different style of measurement.

These complicated designs require the excavation to be completed prior to measuring. Once the excavation is complete, you follow these easy steps:

  1. Lay a string line down the centre of the excavation, starting and ending 100mm outside the pond.
  2. Create marks along this line every 1.35m.
  3. From each of these marks measure out in both directions at a right angle to create a composite of 1.35m wide rectangles

These composite rectangles can then be used to create a liner which approximates the shape of your pond. A detailed instruction sheet can be downloaded from here or you can contact us for more information or assistance.

Profile Form

Profile form (or box welded) liners can often be measured by drawing a simple plan of the feature and measuring all its sides. This assumes that all the walls are straight and all corners encountered are right angles. Alternatively, if the the feature is a circle, half circle or quarter circle you simply need to supply us with the diameter or radius and the depth.

On the occasions where curves or angles other than 90 degrees are involved, we will require a template to be made. These templates can be made from plastic sheets or some other easy to use and fold material which will not stretch or change shape. The template should be cut so it is a perfect fit for the base of the pond, and be clearly marked which side is up. Our factory will then use this template to trace out a base and create a liner that “fits like a glove”.