Our bonded underlay is strong, tear-resistant and hard to puncture. Underlay should be used with all flexible pond liners as a pre-lining to protect the pond liner from imperfections and sharp objects,
Unlike many other budget pond linings, our Bonded Underlay features low moisture retaining properties. This is essential to keep the material workable when wet. This feature also saves time and energy during the installation process.
Our Bonded Underlay comes in two different strengths. 200 gsm and 250 gsm. we recommend the 250 gsm as it is the strongest option available to the pond keeper.
All of our Pond Liners feature a lifetime guarantee only when properly installed with one of our unlerlays.
To calculate the correct dimensions of your pond liner, use the following guide…
Total Length = Length (in metres) Depth (in metres) Depth (in metres)
Total Width = Width (in metres) Depth (in metres) Depth (in metres)
If you require further help to work out what size liner you need, please read our 5 steps to building a flexible liner pond
- Higher tear resistance than fleece underlays
- UV stable so wont degrade in sunlight
- low absorbance so remains easy to work with even when wet
- Root resistant.