For humans, crawlers and LLMs
A structured index of the entities behind this site: who publishes it, the lining materials it compares, the technical concepts it explains and the pond types it is written for. Each entry points at the page that covers it. A machine-readable version is available at /entitymap.json.
Independent UK publisher covering pond liners: material comparisons, sizing tools and installation guides. Publishes as a brand rather than under a personal byline.
The materials a pond can be lined with, and the pages where each is compared on published specification rather than marketing claim.
An impermeable membrane or shell used to retain water in an artificial pond. The parent concept for everything else on this site.
Synthetic rubber, the usual choice for UK garden ponds. Sold at 0.75mm and 1.02mm. Firestone publishes a 20 year warranty on its PondGard grade, excluding punctures. Roofing-grade EPDM is a different product and is not fish safe.
The older flexible rubber lining, typically 0.75mm. Slightly more forgiving than EPDM around complex organic shapes, which suits wildlife ponds.
The budget lining material, typically 0.5mm. Cheaper and lighter than rubber but least stable under ultraviolet exposure, so the strip above the water line degrades first.
Stiffer than rubber and used for large or commercial installations, often welded on site rather than laid as a single sheet.
More flexible and cheaper than HDPE but less hard-wearing. Not the natural choice for a garden pond.
A natural sealing clay that waterproofs by swelling when wet. Used for large informal ponds and dependent on suitable ground conditions, so not a like-for-like alternative to a sheet liner.
Used for rigid preformed shells. More durable and more expensive than moulded plastic, and suited to permanent formal ponds.
A protective fabric layer laid beneath the liner at the same size, guarding against sharp stones and roots. Puncture damage from below is the most common cause of failure and is normally excluded from a manufacturer guarantee.
The technical ideas this site explains, including the two failure modes most often misdiagnosed.
Calculating sheet size by adding twice the maximum depth and twice the edge allowance to both the length and the width of the pond. A free calculator and size chart are published on this site.
Sunlight breaking down liner material over time. The strip above the water line is the only part in direct sun, which is why a liner typically fails at the edge rather than underwater. This is why concealing the edge is a durability measure, not only a cosmetic one.
Absorbent material such as turf or soil draped over the rim and touching the water siphons it out by capillary action until the level drops below the contact point. Routinely misdiagnosed as a puncture.
Marking out and levelling, digging with marginal shelves, clearing the excavation, laying underlay, fitting the liner, filling slowly, then trimming and edging in that order.
Hiding the exposed liner flap using a stone overhang, gravel beach, marginal planting, turf, a bog garden or timber edging.
The kinds of pond the guidance on this site is written for.
An ornamental or naturalistic pond in a domestic garden. The default context for everything published here.
A pond built to support amphibians, insects and birds, characterised by a shallow beach entry giving access in and out.
A pond stocked with koi carp, requiring greater depth than a wildlife or ornamental pond and affecting both liner size and edge treatment.