Aquascape Pond Liner & Underlay
Build a watertight pond on a protected foundation
The liner contains the water; underlay protects it from the prepared ground. Further protective layers may be needed where rocks or other components bear on the liner. Treat these as separate parts of the build, and size them for the full excavation, shelves and edge finish rather than the pond’s surface dimensions alone.
Is underlay waterproof?
No. It cushions and separates materials but does not replace the pond liner. A leaking pond cannot be repaired simply by adding more underlay.
Measure across the finished excavation
For a simple vertical-sided rectangle, an initial liner estimate is length plus twice depth, and width plus twice depth, with an edging allowance added to each dimension. Shelves, irregular contours and waterfalls need their actual profile measured. Check before ordering rather than relying on a rough surface-area calculation.
Protect both the build and future access
Remove sharp material, prepare a stable base and fit the specified underlay. Heavy stone needs appropriate protection and handling; ordinary fleece does not make a sharp point harmless. Plan skimmer, pipe and waterfall connections before filling, leaving sufficient liner at the edges until the pond settles.
Can any tape repair an EPDM liner?
Use a repair or seam system specified for the liner material, including its cleaner, primer and preparation process. General-purpose tape or sealant is not a substitute for a designed liner joint.
