Pool Liners Above Ground (2026): Overlap vs U-Bead
Accessories
Pool liners above ground are vinyl shells you match to the pool diameter and the wall height. This guide compares an overlap liner and a unibead liner, then walks the measure, level, cove, and fill steps in the order that keeps wrinkles out.
Our picks
An above ground pool liner is the vinyl shell that holds the water inside the wall. It is not a structural part of the pool, but it is the part you look at and the part that leaks when it fails. The two liners below cover the common cases, and the rest of the guide is the measuring and install work that decides whether the floor ends up smooth or wrinkled.
Shop around and you will see the same three words on every liner: overlap, beaded, and unibead. Pick the one that matches the top of your pool wall, then buy the size that matches the pool. That order matters, because a perfect liner in the wrong attachment will not fit, and the right attachment in the wrong size will not either.
This guide sits with the other pool accessories gear, next to the pool pad, liner patch kit, and above ground cover guides. For the wider deck picture, start with the pool skimmer pillar.
How long does an above ground pool liner last?
Plan on six to ten years. The carton says 25 or 30 years, but that number is a prorated warranty that loses value every year, with roughly the first two to five years covered in full.
The variables are sun, chemistry, and the base under the liner. UV breaks down the color first, so a pool that sits uncovered all summer fades sooner. Chlorine that runs hot, or a floor that never got leveled, shortens the run further.
Owners who keep the water balanced and cover the pool in the off season are the ones who get the far end of that range. A 40 mil or heavier liner can push past ten years, but most above ground owners are working with standard or 16 mil vinyl and should not count on it.
When you start seeing wrinkles that would not come out, seams that separate, or a leak you patch every month, the liner is near the end and a new one is cheaper than a slow water bill.
Which liner type fits your pool?
Match the attachment to the top of your pool wall. If the wall has a plastic track running along the top edge, you have a bead receiver and you can run a beaded or unibead liner. If it does not, you are choosing between an overlap liner and a unibead liner installed as a J-hook.
Overlap, beaded, or unibead?
The overlap liner is the beginner pick. It leaves extra material over the wall, so a slightly off measurement, a footprint in the sand, or a deep end still works out. The tradeoff is the look: you can see the vinyl hanging under the top rails from outside the pool, and you may want to tuck or trim it.
A beaded liner looks the cleanest because the waterline is a straight edge and nothing hangs outside. It needs the bead receiver on the wall, and it is cut to one exact height, so there is no slack to hide a measuring mistake.
A unibead liner does both. Peel the hook off and it snaps into a track like a beaded liner, or leave the hook on and hang it like an overlap liner without the mess. The J-hook design also avoids the small gap behind a receiver track where water can sit and corrode the wall, which is the one long-term knock on a plain beaded liner. Most above ground pools today ship set up for unibead, and that is why it has become the default.
Best overall: VEVOR 18-ft Round Overlap Liner
The VEVOR 18-ft Round Overlap Liner is the one to start with for a typical round above ground pool. It is a 16 mil vinyl sheet built for a flat-bottom 18 foot round pool with a wall from 48 to 54 inches tall, and the extra material at the top is exactly what makes it forgiving.
The liner measures about 216 inches across and ships near 52 pounds in the box, which is a two-person lift. It comes with the standard overlap top, so have a set of coping strips on hand if your pool does not already have them.
Buy it if you have an 18 foot round pool, you are not sure of the exact wall height, or you want one liner that covers more than one setup. Skip it if you want a perfectly straight waterline with nothing hanging outside, or if your pool has a bead track and you would rather not remove the top rails at all.
Best value: VEVOR 18-ft Round U-Bead Liner
The VEVOR 18-ft Round U-Bead Liner is the pick when your pool has a bead receiver or you want to avoid taking the pool apart. It is made for a flat-bottom 18 foot round pool with a 52 inch wall, and it installs either as a J-hook over the wall or as a beaded liner snapped into a track. It is running about 22 percent off a $161.90 list right now.
Run it as a J-hook and you skip the receiver track, the place where water can collect and rust the steel, and you still get a straight top edge. When you replace a liner down the road, the same design lets you pull the old one and seat the new one without touching the uprights.
Buy it if your pool has a 52 inch wall and either a bead track or a plain wall, or if you plan to swap liners again someday. Skip it if your wall is 48 or 54 inches, or if you want the extra slack an overlap liner gives you on an uneven base.
Pool liner comparison
Both are 18 foot round liners, so the price gap is largely the thickness and the trim. If you are replacing a liner on a pool you plan to keep for a decade, the heavier overlap sheet is the safer bet. If you want the simplest swap and the lowest entry price, pick the U-bead.
How do you measure for an above ground pool liner?
Measure the pool, not the old liner. Write down the diameter or the length and width, the shape, and the wall height from the top rail to the floor. That set of numbers picks the liner.
For a round pool, measure straight across the center twice, at right angles, and take the average. For an oval or rectangle, measure both dimensions. Wall height is the one people fumble: measure from the top edge of the wall down to the bottom of the floor, not the water line.
What temperature is best for installing a liner?
Wait for a day at 70°F or higher. Warm vinyl stretches, so the wrinkles pull out with a gentle tug instead of fighting back. A cold liner is stiff, and the folds you leave in it on a 50°F morning are the folds you stare at all summer.
If you have to work in cooler weather, spread the liner in the sun for a while first. Do not use a heater or a torch near the vinyl. Sun is enough, and patience is cheaper than a new liner.
How do you install an above ground pool liner?
Install in this order, and do not rush the base.
- Drain the old pool and remove the old liner. Keep a few inches of water in the bottom so the wall does not shift.
- Fix the floor. Fill holes, remove stones and roots, and level the sand with a long board and a level.
- Build the cove. Pack a six to eight inch tall, rounded bead of sand at the base of the wall, or set a foam cove, then spread two inches of mason sand over the whole floor.
- Set the liner. Center it across the pool and unfold it. The seam where the wall meets the floor should sit right on top of the cove.
- Attach the top. Drape an overlap liner over the wall and set the coping strips, or snap a beaded liner into the track. Leave it loose.
- Pull the wrinkles. Remove the air behind the liner with a shop vac, working the folds toward the wall before any water goes in.
- Fill slowly. Add a few inches of water, work out any remaining wrinkles with your feet or a soft broom, then keep filling.
The wrinkles come out with a shop vac
The trick that separates a smooth floor from a lumpy one is air, not water. Pull the vacuum hose through the skimmer or return opening and tuck it behind the liner, then seal the opening with tape or cardboard. When the vacuum runs, the liner presses flat against the wall and floor, and you can push the last wrinkles toward the edge by hand. Shut it off, check the fit, and only then start adding water. Once the water weight is in, moving the liner damages it.
What goes under an above ground pool liner?
A leveled base, a cove, and a pad. The base is the sand. The cove is the rounded sand or foam at the wall. The pad is the geotextile sheet that sits over the sand to blunt rocks, roots, and weeds. Skip any of the three and the liner pays for it.
Do you need a pool pad and a cove?
A pad is optional in the strict sense, but it is the cheapest protection you can buy for the liner. A single sharp rock or a buried root can put a pinhole through the vinyl, and once the pool is full that pinhole is a job. The cove is closer to required: it takes the pressure off the corner where the wall and floor meet, which is where liners crease and split. Set the pad over the sand, set the cove, and then set the liner on top.
Can you replace a liner without taking the pool apart?
Sometimes. A beaded or unibead liner on a pool with a bead receiver can be swapped without removing the top rails, the uprights, or the wall. You drain the water, unseat the old bead, snap in the new liner, and refill.
An overlap liner is different. It is held by the coping strips under the top rails, so you remove the rails and coping to free the old liner and seat the new one. That is a longer Saturday with at least one helper. If a future swap matters to you, that is the single strongest reason to pick a unibead liner now even if you install it as a J-hook today.
Bottom line
Buy the VEVOR 18-ft Round Overlap Liner for a round pool where the wall height could be 48, 52, or 54 inches and you want the thicker sheet. Buy the VEVOR 18-ft Round U-Bead Liner if your pool has a 52 inch wall and a bead track, or if you want the lowest cost per square foot and the easiest future swap.
Whichever you pick, the liner is only half the job. Level the floor, build the cove, pull the air out with a shop vac, and fill on a warm day. Those four steps are what keep the vinyl smooth and the water where it belongs.
Frequently Asked Questions
How long does an above ground pool liner last?
A well-cared-for above ground liner usually lasts six to ten years. The 25 to 30 year figure printed on the carton is a prorated warranty, not a lifespan, and only the first few years are covered in full.
What is the difference between an overlap liner and a beaded liner?
An overlap liner drapes over the top of the wall and is held down by a plastic coping strip. A beaded liner has a thick edge that snaps into a track called a bead receiver. Overlap is easier to install and cheaper. Beaded gives a straight waterline and can be swapped without taking the pool apart.
What size liner does an 18 ft round pool need?
An 18 ft round pool with a flat bottom takes an 18 ft round liner. Match the wall height as well: a 48 inch pool needs a liner that fits 48 inch walls, and a 52 inch pool needs a 52 inch liner. Overlap liners often cover a range of wall heights.
Can you replace a pool liner without taking the pool down?
Yes, if the pool uses a beaded or unibead liner and a bead receiver. You drain the water, unseat the old bead, snap in the new liner, and refill. An overlap liner usually means removing the top rails and coping, which is a bigger job.
What goes under an above ground pool liner?
A smooth base, then a protective layer. Most installs use two inches of mason sand over the floor, a six to eight inch sand or foam cove at the wall base, and a geotextile pad over the sand to blunt rocks and roots.
Do you have to trim the overlap hanging over the wall?
You can leave it tucked under the top ledge, or trim it. Wait at least two weeks after the pool is full before you cut, and only trim a small amount, because cutting too short can pull the liner out of place.
What temperature should it be to install a pool liner?
Warmer is better. Aim for 70°F or above so the vinyl relaxes and stretches without folds. A cold liner stays stiff and traps wrinkles you will fight all season.
Does a vinyl liner need a certain water level or chemistry?
Keep the water in the pool year round. The weight of the water holds the liner smooth, so draining it invites wrinkles and shrinkage. Balance chlorine and pH weekly and keep the pool covered in the off season to slow UV fading.