Is Your Pool Cover Starting to Sag? Learn How to Prevent and Fix it!
Pool covers are a pool owner’s best friend, keeping the swimming area clean, safe, and conserving water. But when your trusty cover starts to sag, it’s a whole different story. A sagging pool cover not only looks unsightly but can also lead to water accumulation, mold, and mildew growth.
In this comprehensive guide, we’ll delve into the reasons behind sagging pool covers and equip you with practical methods to prevent and remedy this issue.
Understanding the Culprits: Why Does Your Pool Cover Sag?
1. Low Water Level
When the water level in your pool drops below the cover’s top edge, it’s a recipe for sagging. This drop can occur due to evaporation, leaks, or even groundwater infiltration for inground pools.

2. Snow and Ice Accumulation
For those living in snow-prone regions, snow and ice buildup can be a significant contributor to sagging. Regularly removing snow from your pool cover is crucial to prevent it from sagging. An Air Pillow can be your best friend during winter months.
3. Aging Pool Cover
An old, worn-out pool cover is more likely to sag. If yours has seen better days, consider investing in a new one. A fresh cover is not only more durable but less prone to sagging.
4. Improper Installation
If your pool cover wasn’t installed correctly, it can lead to sagging, especially in the middle or at the edges. Incorrect tension, with too much on one side and too little on the other, is often the culprit.
5. Incorrect Size
Using a pool cover that doesn’t match your pool’s size can cause sagging. An oversized cover might even blow away in strong winds, while an undersized one will sag in the middle.
6. Excessive Weight
Excessive weight on the cover, caused by people walking or sitting on it, can lead to sagging. Safety covers, in particular, should never be used as a platform for human activities.
7. Debris Buildup
Leaving trash and debris on top of your pool cover can lead to sagging, especially if you neglect regular cleaning. A pool cover pump is a wise investment to prevent debris buildup during the off-season.
Preventing and Correcting Pool Cover Sagging: Your Action Plan
1. Regular Water Level Checks
To prevent sagging, make a habit of checking your pool’s water level at least once a week. If you notice a drop, add more water to maintain the optimal level.
2. Immediate Leak Repairs
Promptly fix any pool leaks to avoid water level drops that can contribute to sagging. Check around the pool deck, skimmer box, plumbing fixtures, and other potential leak sources.
3. Consider Pool Cover Replacement
If your pool cover is showing its age, it’s time for a replacement. An old cover can become brittle and prone to sagging. Generally, if your cover has been in use for over five years, it’s time for a new one. Make sure you know how to remove your old cover properly.
4. Ensure the Right Fit
To avoid sagging, choose a pool cover that’s the right size for your pool. An undersized cover will sag, while an oversized one can blow away in strong winds.
5. Add Weights
Prevent sagging by adding weights to your pool cover. Sandbags, water bags, or bricks placed evenly around the cover will keep it from sagging in one spot.
6. Correct Installation
Properly install your pool cover by following the manufacturer’s instructions. If you suspect improper installation, adjust the tension by loosening or tightening the straps holding the cover in place. Make sure the tension is even on all sides.
7. Distribute Weight Evenly (Above-Ground Pools)
For above-ground pools, placing a board on top of the cover helps distribute weight evenly and prevent sagging.
How Tight Should Your Pool Cover Be?
Remember that not all pool covers should be pulled tight. Many are designed to have a little slack to accommodate temperature fluctuations. An overly tight cover can stress seams and cause them to fail. Refer to the owner’s manual or manufacturer’s website for guidance on your specific cover. You can also consult a pool professional for help with proper installation.
Sag No More: Protect Your Pool Cover
A little sag is normal for pool covers, but if it exceeds an inch or two, it’s time to take action. By following the tips above, you can prevent your pool cover from sagging and extend its lifespan.
In Closing
A sagging pool cover is the last thing you want when aiming to protect your pool. It’s not just unsightly; it can lead to mold growth. If you’re dealing with a sagging pool cover, follow our tips and tricks, from maintaining water levels to proper installation, to keep your pool safe and clean.