Vinyl liner pools get described as the budget option, which undersells them and also hides where the money actually goes. The liner is the part you see and the part you eventually replace. The structure behind it is what decides whether the pool is still square and sound when that day comes. Here is how a vinyl pool is built and where the important choices are.
The wall panels
A vinyl pool's walls are prefabricated panels bolted together into the pool's shape, then braced from behind and set in concrete footings. The two common materials are galvanized steel and structural polymer.
- Steel is strong, rigid and widely used. Its weakness is corrosion over a long time in wet soil, and salt-chlorinated water makes that worse if the liner ever leaks behind it.
- Polymer does not rust and is not affected by salt. It costs more and is slightly more flexible, which good bracing handles.
Piedmont red clay holds water against the outside of the wall for long stretches after rain, so on a lot with poor drainage or a planned salt system, polymer earns its price. On a well-drained lot with a conventional chlorine plan, steel is a sound choice.
Excavation and footings
The hole is dug larger than the pool so the crew can work behind the walls. The panels are set on a footing, leveled, plumbed and bolted, and then a concrete collar is poured around the base of the wall to lock the whole ring in place. The bracing behind each panel is anchored into this concrete. Nothing about this stage is glamorous, and all of it is structural.
The floor
Under the liner, the floor is built from a hard, smooth base, usually a cement-and-sand mix or vermiculite troweled over compacted earth. It is shaped to the design's slopes and the transition into the deep end, then troweled smooth, because every ridge and pebble will telegraph through the liner and be felt underfoot. A properly finished floor feels like a single surface once the water is in. A rushed one feels like a driveway.
Steps, benches and features
Steps can be built into the structure and lined over, which looks seamless and modern, or added as a molded fiberglass or polymer unit with its own finish. Tanning ledges and benches follow the same logic. Every one of these is measured to the fraction of an inch because the liner is manufactured from those measurements. If you are thinking about a shallow shelf, this post on sun shelves covers the design decisions that apply to any pool type.
Plumbing and equipment
Skimmer, returns, main drain and any features are plumbed through the wall panels with fittings that seal to the liner. The lines run to the equipment pad where the pump, filter and heater are installed. Pressure testing before backfill is standard.
The liner
The liner is custom made from the pool's measured dimensions and arrives folded in a box. It is spread, positioned, and drawn tight against the walls and floor with a vacuum so it sits without wrinkles, then locked into a track at the top of the wall. Water goes in while the vacuum holds the liner in place. Once the water is deep enough to hold the liner itself, the fittings are cut in and the vacuum comes off. Liner thickness and pattern are chosen up front; thicker liners resist punctures and fading a bit better.
Coping and deck
The top of the wall panel carries the liner track and the coping. On a vinyl pool the coping is often aluminum or a cantilevered concrete edge, though stone and paver coping are done as well. The deck is poured or laid after the pool is full, tied to the coping and graded away from the water like any other pool deck.
Where vinyl fits
A vinyl pool makes sense when the budget favors a lower initial cost, when the shape and size wanted are not available as a fiberglass shell, or when the homeowner is comfortable planning for an eventual liner replacement. Our post on liner replacement is worth reading before you commit, so the long-term picture is clear.
We build gunite, fiberglass and vinyl liner pools across the Triad, from Burlington to Lexington. See what we build, or ask for a free consultation and we will talk through which structure is the right one for your yard and your plans.