Pool Liner Peeling: What to Do

Introduction

Have you noticed that your pool lining is detaching from the walls or floor? This is a problem that affects many pools in Margem Sul, especially those over 10 years old or that have gone through extended periods without water.

Lining detachment is not just a cosmetic problem – it can lead to water leaks, algae accumulation behind the liner, structural damage and eventual need for complete replacement. The sooner you identify and address the problem, the lower the repair cost will be.

In this article, we explain the causes of detachment, how to identify the different types of problems, when it's possible to repair and when replacement is necessary, and how to prevent this from happening to your pool.

Types of Pool Lining

Liner (Vinyl)

The most common type in residential pools:

How it's fixed:

• Track (rail) at top of walls
• Water weight presses against walls/floor
• No glue on most of the surface

Reinforced Membrane (Reinforced PVC)

The more durable option:

How it's fixed:

• Mechanical fixing profiles
• Heat welding at joints
• May have adhesive in specific areas

Mosaic/Tiles

The traditional lining:

How it's fixed:

• Tile adhesive on prepared surface
• Grouting of joints
• Requires prior waterproofing

Causes of Detachment

In Liner (Vinyl)

Most common causes:

1. Pool draining:

• Water weight holds liner in place
• Without water, liner contracts and wrinkles
• When refilling, it no longer sits correctly

2. Water behind liner:

• High water table
• Leaks in the pool itself
• Rainwater infiltration
• Creates bubbles that push the liner

3. Natural deterioration:

• UV degrades PVC over the years
• High chlorine accelerates degradation
• Liner becomes rigid and loses elasticity

In Reinforced Membrane

Most common causes:

In Mosaic/Tiles

Most common causes:

How to Identify the Problem

Warning Signs in Liner

Visual:

• Wrinkles on floor or walls
• Bubbles (with air or water)
• Liner "loose" in areas
• Irregular discolouration
• Different texture (hard vs. flexible)

To the touch:

• "Soft" or hollow areas
• Liner not sitting on walls
• Visible detachment at corners

Simple test:

1. With pump off
2. Gently press the liner
3. If you hear bubbling = water behind
4. If it feels empty = air behind

Warning Signs in Mosaic

Visual:

• Deteriorated or missing grout
• White stains (efflorescence)
• Misaligned tiles
• Cracks in mortar

To touch/sound:

• Tap gently on tiles
• Hollow sound = detached
• Solid sound = well bonded

Practical test:

1. Use a coin to tap
2. Compare sound in different areas
3. Mark tiles with hollow sound

When to Repair vs. Replace

Liner – Can Repair If:

Liner – Should Replace If:

Mosaic – Can Repair If:

• Less than 10% of tiles affected
• Problem localised to one area
• Replacement tiles available
• Underlying structure intact

Mosaic – Should Redo If:

• More than 30% affected
• Widespread problem
• Waterproofing compromised
• Visible structural cracks

Solutions for Liner

Small Wrinkles

Method 1 – Heat (DIY):

1. Heat water to 35-40°C
2. Pour over the wrinkle
3. Smooth with soft brush
4. Can use hairdryer carefully

Method 2 – Partial reinstallation:

1. Partially drain
2. Pull liner in correct direction
3. Refill slowly
4. Guide liner with brush

Air Bubbles

Procedure:

1. Locate highest point of bubble
2. Make small puncture
3. Press to expel air
4. Apply patch if necessary

Water Bubbles

Temporary solution:

1. Identify water source
2. Install relief drain (if none exists)
3. Lower water table level (if possible)

Permanent solution:

• Perimeter drainage system
• Bottom drain with valve
• Consider reinforced membrane when replacing

Rail Detachment

Professional procedure:

1. Drain to below rail
2. Heat liner to make flexible
3. Reinstall in rail section by section
4. Refill in controlled manner

Solutions for Mosaic

Localised Loose Tiles

Materials:

• Epoxy adhesive for pools
• Notched trowel
• Grout for joints
• Replacement tiles

Procedure:

1. Remove loose tiles
2. Clean surface (remove old adhesive)
3. Check if support is solid
4. Apply new adhesive
5. Place tiles
6. Let cure 24-48h
7. Grout joints
8. Wait 7 days before filling

Deteriorated Grout

Signs:

• Crumbling grout
• Open gaps
• Moisture stains

Solution:

1. Remove old grout (careful not to damage tiles)
2. Clean joints thoroughly
3. Apply epoxy grout for pools
4. Smooth with trowel
5. Clean excess
6. Cure per instructions

Extensive Problems

For more than 30% affected:

1. Completely drain
2. Assess entire surface
3. Redo waterproofing if necessary
4. Apply new lining
5. Consider alternatives (liner, membrane)

Repair and Replacement Costs

Liner

Reinforced Membrane

Mosaic

Prevention

For Liner

Regular maintenance:

• Keep pH 7.2-7.6 (reduces degradation)
• Chlorine no higher than 3 ppm (avoid bleaching)
• Protect from sun when not in use (cover)
• Never drain completely

Special care:

• Check rail every six months
• Inspect corners and tension areas
• Clean regularly to avoid stains

For Mosaic

Regular maintenance:

• Check grout annually
• Clean efflorescence when it appears
• Keep chemistry balanced

Special care:

• Re-grout before deterioration occurs
• Check tiles for hollow sound
• Repair any detachment quickly

For All Types

Frequently Asked Questions

Can I drain the pool to repair the liner?

With great care and ideally with professional supervision. Never completely drain a liner pool without:

• Checking the water table level
• Being sure you can refill quickly
• Avoiding very hot days (liner contracts)

Most repairs can be done with water in the pool.

How long does a liner last?

Under ideal conditions, 10-15 years. Factors that reduce lifespan:

• Excessive sun exposure
• Unbalanced chemistry
• Draining
• Lower quality liner

Dark coloured liners tend to last less (absorb more heat).

Are liner wrinkles serious?

Small wrinkles are cosmetic and don't affect function. Large wrinkles can:

• Accumulate dirt and algae
• Indicate a more serious problem
• Get worse over time

It's worth trying to smooth them while they're small.

Water behind the liner – what to do?

This is a serious problem that indicates:

• High water table
• Pool leak
• External infiltration

Don't drain the pool! Seek a professional to install an adequate drainage system.

Is liner or reinforced membrane better?

For pools in areas with high water table or intensive use, reinforced membrane justifies the extra investment.

Conclusion

Pool lining detachment can have various causes and different levels of severity. The main points to remember are:

• Identify the type of lining and the specific cause of the problem
• Act quickly – small problems become big ones
• Avoid draining the pool without professional guidance
• Consider the age of the lining when deciding to repair or replace
• Invest in prevention – regular maintenance extends lifespan

If you need professional help with your pool lining in Margem Sul, ManutençãoPiscinas is here to help. Contact us for a no-obligation assessment.