Our Underlay / Overlay is a 2.5-3mm thick spunbound Polypropylene material in black that is designed to be puncture resistant and is ideal for protecting your pond liner from roots, small pebbles or rough/uneven concrete and wooden surfaces. Our specification sheet can be downloaded from the tab below.
Butyl rubber remains the top choice for professional pond builders and water gardeners due to its highly flexible, durable nature and because it is totally non-toxic and does not harm any aquatic or plant life. It is long lasting and completely UV stable so will not crack or split if left exposed to normal sunlight.
EPDM rubber, while offering the same high quality and resistances as Butyl rubber, is a popular budget friendly alternative that has a shorter expected working lifetime.
Our flat sheet Butyl rubber pond liner carries a 20 year guarantee and has an expected working lifetime of around 50 years.
Our flat sheet EPDM rubber pond liner carries a 10 year guarantee and has an expected working lifetime of 20 to 30 years.