How To Put A Cover On An Above Ground Pool: Step-by-Step Installation Guide

Installing an above ground pool cover correctly requires centering an inflated air pillow to absorb freeze-thaw expansion, draping a high-density polyethylene cover evenly over the top rail, and securing the perimeter using a ratcheted cable and winch system. To prevent wind displacement and wall buckling, edge clips or shrink wrap must seal the overhang while maintaining a water depth 3 to 6 inches below the skimmer faceplate.

Essential Gear & Water Chemistry Preparation Checklist

Proper preparation prevents structural pool wall failure, cover tearing, and severe winter algae growth. Before draping any winter cover, the pool's structural frame and water chemistry must be brought within precise operational parameters. Never install a cover over unbalanced water, as hyper-acidic or overly alkaline conditions degrade the cover's underside laminate within months.

Essential Tools & Materials

• Solid Winter Cover: Correct size based on pool diameter/dimensions, plus a minimum 3-to-4-foot overlap allowance.
• Heavy-Duty Air Pillow: 4x4 ft or 4x15 ft industrial vinyl air pillow (gauge thickness of 16–22 mil).
• Cable and Winch System: Vinyl-coated steel cable with a heavy-duty aluminum ratcheting winch assembly.
• Pool Cover Clips: Plastic top-rail lock clips (minimum 2 clips per upright post).
• Winterizing Chemical Kit: Non-chlorine shock, polyquat 60 algaecide, and sequestering agent.
• Submersible Cover Pump: Automatic electric pump rated at 350–500 GPH (Gallons Per Hour).
• Winter Expansion Plugs & Skimmer Faceplate Cover: Rubber expansion plugs with stainless steel wing nuts and an Aquadoor skimmer cover.
• Grip Tape or Heavy-Duty Pool Shrink Wrap: For perimeter sealing against wind lift.

Mandatory Prerequisite Standards

• Free Available Chlorine (FAC): Elevated to 3.0–5.0 ppm via shock 24 hours prior to cover placement.
• pH Level: Balanced precisely between 7.2 and 7.6.
• Total Alkalinity (TA): Maintained between 80 and 120 ppm.
• Water Line Level: Lowered 3 to 6 inches below the bottom of the skimmer mouth (unless using an Aquadoor plate, which allows filling to normal operating levels).

Operational Benchmarks

• Estimated Duration: 1.5 to 3 hours for complete installation.
• Labor Requirements: 2 adults recommended (attempting single-person installation during windy conditions risks cover tear).
• Estimated Budget: $120–$400 total (depending on cover denier rating and mechanical accessories).

Master Execution Workflow for Above Ground Pool Covers

Step 1: Balance Water Chemistry and Prepare Mechanical Components

Do not cover a dirty or chemically imbalanced pool. Run the filtration pump continuously for 24 hours after adding winterizing chemicals to ensure complete dispersion throughout the water column. Clean the floor using a manual vacuum to remove organic debris that could decay and stain the liner.

1. Super-chlorinate the pool to eliminate residual pathogens, then add a 60% non-foaming polyquat algaecide to inhibit winter bloom.
2. Disconnect the return jet fitting using a plug wrench and insert an expansion plug.
3. Drain the pump, filter tank, and heater according to manufacturer specs. Store the equipment indoors to prevent ice cracking.
4. Insert a Gizzmo or expansion plug into the bottom of the skimmer housing to absorb ice expansion inside the pipe.

Warning: Never leave an above ground pool completely empty or drained below 18 inches from the bottom. Hydrostatic pressure shifts and severe ice expansion will collapse the steel pool walls without the internal counter-weight of water.

Step 2: Inflate and Anchor the Central Air Pillow

The air pillow does not exist to hold up snow; its primary mechanical purpose is to act as an expansion compensator. As water freezes, it expands outward toward the pool walls. The pillow compresses under the ice sheet, relieving lateral outward pressure on the pool's metal structure.

1. Inflate the air pillow to 60% to 70% of its total capacity using an electric air pump or shop vac on reverse. Do not over-inflate; fully inflated pillows burst under winter ice loads.
2. Tie 1/4-inch braided polypropylene ropes to the corner grommets of the pillow.
3. Thread the ropes across opposite top rails of the pool to position the pillow directly in the geographical center of the pool.
4. Tie the ropes loosely to the outer frame or top rail supports, allowing the pillow 4–6 inches of vertical play as the water level shifts.

Pro-Tip: Wrap duct tape over the valve stem of the air pillow after inflation to prevent slow air leaks caused by sub-freezing thermal contraction of the plastic valve plug.

Step 3: Unfurl and Position the Cover Uniformly

Handling a heavy winter cover requires controlled alignment to avoid snagging the fabric on sharp top-rail screws or aluminum coping edges.

1. Unfold the cover alongside the pool exterior. Identify the top side (UV-resistant layer, usually colored dark blue, green, or black) and the bottom side (usually black to inhibit photosynthesis).
2. With two people standing on opposite sides of the pool, lift the cover high to catch an air cushion underneath it, pushing it across the pool surface over the top of the central air pillow.
3. Adjust the drape so that the cover sags naturally down to touch the surface of the water around the air pillow, maintaining an even overhang (typically 3 to 4 feet) around the entire outer perimeter.
4. Ensure the cover is not pulled taut like a drum skin across the top rails. The cover MUST rest directly on the surface of the water to transfer snow and ice loads safely down to the water column rather than pulling down on the top rails.

Warning: If the cover hangs in the air over the water surface, the weight of the first major snowfall will rip the grommets out of the fabric or collapse the pool frame inward.

Step 4: Thread and Tension the Cable and Winch System

The perimeter cable holds the cover beneath the ledge of the top rail, preventing upwards wind displacement.

1. Thread the vinyl-coated steel cable through every perimeter grommet along the outer edge of the cover overhang.
2. Locate the two loose ends of the cable at a point between two upright posts that is protected from direct prevailing winds.
3. Insert the left cable end through the ratcheting axle of the aluminum winch, followed by the right cable end from the opposite direction.
4. Turn the winch handle clockwise to pull the cable taut beneath the lip of the top rail.
5. Continue ratcheting until the cable fits tightly against the pool wall underside, ensuring no slippage is possible under hand tension.

Pro-Tip: Lock the ratchet mechanism by flipping the safety catch into the gear teeth. Apply a small coat of silicone grease to the winch gears to prevent rust and lock-up over the winter.

Step 5: Implement Anti-Wind Uplift Defenses

High wind entering under the cover's overhang acts like a parachute, generating severe lift forces that can snap perimeter cables and toss winter covers across properties.

1. Install plastic cover clips over the cover and top rail edges. Place two clips between every set of upright posts (or every 18–24 inches).
2. For maximum wind resistance in high-gust regions, wrap heavy-duty pool shrink wrap or commercial stretch film around the outer circumference of the pool wall.
3. Start wrapping 3 inches above the cover grommet line and proceed downward around the top rail perimeter 3 to 5 full times, completely sealing the air gap beneath the cover overlap.

Pool Cover Material Properties & Mechanical Specs

Selecting the correct material grade and understanding structural mechanical thresholds ensures long-term cover durability under multi-ton ice loading.

Structural Failures & Winter Maintenance Remedies

Scenario 1: Air Pillow Shifts to One Side During Cover Placement

• Root Cause: Ropes tied too tightly before drape placement, or single-rope centering causing pivot displacement during cover pulling.
• Actionable Fix: Use a four-point harness system using polypropylene rope attached to four opposing top rails. Never tie the pillow completely rigid; leave 4–6 inches of slack to allow the pillow to move vertically with water displacement without breaking alignment.

Scenario 2: Cable Snaps or Winch Loses Mechanical Tension

• Root Cause: Over-tightening the winch beyond hand-tight tension during freezing conditions, or extreme wind lift straining metal grommets against the cable.
• Actionable Fix: Release the winch slightly if severe freezing occurs. If the cable snaps, immediately loop an industrial heavy-duty ratcheting cargo strap through the grommet zone as an emergency stopgap, then install a replacement vinyl cable.

Scenario 3: Excessive Surface Water Accumulation Threatening Cover Collapse

• Root Cause: Failure to drain rain and snowmelt off the solid cover surface using a dedicated cover pump, resulting in hundreds of pounds of dead weight pulling down on top rails.
• Actionable Fix: Place an automatic electric submersible cover pump equipped with a wide base plate directly onto the cover near the center displacement area. Keep the discharge hose clear of ice blockages to automatically drain excess water when temperatures rise above 32°F (0°C).

Scenario 4: High Winds Lifting Cover Overhang and Snapping Edge Clips

• Root Cause: Inadequate perimeter sealing allowing wind to penetrate underneath the cover skirt, creating positive upward pressure.
• Actionable Fix: Remove broken clips and apply 4–6 tight horizontal layers of commercial-grade pool wrap film around the top rail perimeter, completely sealing the overlap edge against the exterior corrugated pool wall.

Frequently Asked Questions

How far down should I lower my water level before covering an above ground pool?

Lower the water level 3 to 6 inches below the bottom of the skimmer mouth if using a standard winter plug. If using an Aquadoor skimmer faceplate cover, you do not need to lower the water level, which helps preserve structural support for the pool wall during winter.

Is an air pillow mandatory when putting a cover on an above ground pool?

Yes, an air pillow is essential for above ground pools in freezing climates. It acts as an ice expansion compensator, compressing under ice buildup to absorb lateral outward forces that would otherwise rupture pool walls or stretch the liner.

How tight should the pool cover cable and winch be torqued?

The cable should be torqued hand-tight until the cover overhang is held firmly flat against the outer wall beneath the top rail ledge. Do not over-torque using mechanical tools, as this can pull grommets out of the fabric or snap the ratcheting winch gears under freezing temperatures.

Can I install an above ground pool cover by myself?

While possible on small round pools (under 15 feet) on windless days, single-person installation is strongly discouraged. Having at least two people ensures uniform placement across the air pillow and prevents cover tears on sharp metal frame components.

How do I remove pooled water from the top of the cover without collapsing it?

Position a specialized, lightweight submersible cover pump equipped with a base plate in the deepest puddle on top of the cover. Maintain an underlying pool water level sufficient to float the cover, preventing hydrostatic lock while the pump clears surface water.

Protect Your Pool Investment This Season

Installing a cover correctly protects your above ground pool from catastrophic structural frame damage, costly liner tears, and extensive spring cleanup effort. Take the time to secure your pool with high-density materials, proper chemical balance, and wind defenses to ensure an effortless, crystal-clear pool opening next season.