How To Install An Above Ground Pool Liner

Overview

Installing an above ground pool liner correctly is essential to ensure a proper fit, smooth finish, and long liner life. Temperature, sunlight, and liner preparation all play major roles in the success of your installation. Follow the steps and tips below for the best results.

1. Preparation and Ground Setup

• All above ground liners require a 4"–8" sand or foam cove where the pool wall meets the floor.
• The pool floor should have a 2" even layer of mason sand, even if using a foam bottom or Rhino Pad.
• Install the Rhino Pad or foam bottom over the sand base and under the cove. If using foam cove, place the pad or foam bottom beneath it.
• Make sure the entire pool frame (uprights, top rails, stabilizer bars) is fully assembled before filling with water for stability.
• Check weather: the temperature must be at least 20°C (70°F) and sunny during installation and filling.
• Avoid placing the liner’s vertical wall seam directly over the skimmer or return cut-outs.

2. Unpacking and Positioning the Liner

• Unpack and unfold the liner in the center of the pool, ensuring the box lid (with staples) does not touch the liner.
• Spread the liner out evenly and allow it to warm up under direct sunlight for easier stretching.
• The floor seams should form straight lines across the pool bottom. If seams appear flapped, confirm the correct side is facing up.
• Smooth out any wrinkles across the floor.

3. Attaching the Liner

For Standard Bead / U / J Hook Liners:

• If your pool has a bead track, remove the U/J hook when converting a Unibead liner to a standard bead liner (see your liner’s installation sheet).
• For U or J Hook applications, hang the liner directly over the wall and secure it with the metal or resin stabilizer bars. Plastic coping strips are not required.

For Overlap Liners:

• For oval pools, start at the bowed ends to center the liner, then work toward the straight sides.
• When hanging, secure the liner using both the plastic coping strip and metal/resin stabilizer bar to prevent the liner from slipping during filling.

All Liner Types:

• Begin securing the liner at the 12, 3, 6, and 9 o’clock positions, then attach between these points until complete.
• Do not force the liner snug against the floor, cove, and wall. Allow a slight gap; the liner will stretch downward as the pool fills.
• Failure to start at the four clock positions can make the liner appear too large or too small.

4. Smoothing and Filling

• Add just a few inches of water to the pool. At this point, smooth the liner along the walls to remove wrinkles.
• For best results, a shop vacuum can be used to remove wrinkles before filling:
  • Insert the hose through the return opening and behind the liner, about 4" above the pool floor.
  • Seal any air gaps around the skimmer and return to ensure good suction.
  • Once suction begins, smooth wrinkles outward from the center toward the wall.
• Continue filling until the water is 3" below the lowest opening (return or skimmer).
• Install the return jet once the water is 3" below its hole, and install the skimmer once water is 3" below its opening.

5. Important Notes During Filling

• Do not install faceplates, inlets, or light fixtures until water reaches 3" below the opening; installing too early can cause tearing as the liner stretches.
• Some bowing of the pool walls is normal while filling.
  • If you notice excessive bending or pulling, stop filling immediately.
  • Drain partially and add more mason sand to the cove area to relieve pressure and correct alignment.
• Once the pool is full, attach “No Diving” stickers two inches above the waterline in visible positions around the pool.

6. Troubleshooting Fit Issues

Even experienced installers need to make adjustments. If your liner appears off by a few feet, it’s likely still the correct size.

• Warm, sunny days make the liner more flexible and easier to stretch.
• Cool days can make liners appear too small, as they are less elastic.
• Let the liner hang and warm before attempting to pull or stretch it.

Summary

Proper temperature, even base preparation, and patient alignment are key to a smooth above ground liner installation. Follow the steps carefully, allow the liner to stretch naturally as you fill, and secure it at key points to avoid shifting or tearing.