Calculate the size of pond liner needed based on pond dimensions and depth.
Liner size = Pond dimension + (2 × Max Depth) + (2 × Overlap)
Add twice the maximum depth plus twice the overlap to both the length and width of the pond.
0.75 mm (30 mil) for small ponds, 1.0 mm (40 mil) for medium, and 1.14 mm (45 mil) for large or fish ponds.
Yes – always use a protective underlay (geotextile) beneath the liner to prevent root and stone punctures.
Butyl rubber and EPDM are the most flexible and longest-lasting, making them ideal for fish ponds. PVC is cheaper but less durable and harder to repair.
Allow about 300 mm (1 ft) of liner beyond the edge all round so you can anchor it securely under stones or turf.