Why Is My Arizona Pool Plaster Cracking? Causes & Fixes
Noticing cracks in your pool plaster can be alarming—and for good reason. While some cracks are purely cosmetic, others can signal deeper structural issues that shouldn’t be ignored.
If you live in the Phoenix or East Valley area, your pool is exposed to extreme heat, strong UV rays, and hard water—all of which can accelerate wear and tear.
Here’s what you need to know about why pool plaster cracks, what it means, and how to fix it.
Is Cracked Pool Plaster a Big Problem?
The answer depends on the type of crack.
Some cracks are:
- Surface-level (cosmetic)
- Caused by normal aging
Others can indicate:
- Structural movement
- Water damage
- Underlying shell issues
The key is identifying the difference early.
Common Causes of Pool Plaster Cracking
1. Age and Normal Wear
Pool plaster doesn’t last forever.
In Arizona, plaster typically lasts:
- 7–12 years (sometimes less due to extreme heat)
Over time, it naturally:
- Dries out
- Shrinks
- Becomes brittle
Small cracks are often a sign your plaster is simply reaching the end of its lifespan.
2. Extreme Heat & Sun Exposure
In places like Phoenix and surrounding areas, temperatures regularly exceed 100°F.
This causes:
- Expansion during the day
- Contraction at night
- Over time, that constant movement can lead to cracking.
3. Improper Water Chemistry
Unbalanced pool water is one of the leading causes of plaster damage.
Issues like:
- Low calcium levels
- High acidity (low pH)
- High chlorine levels
…can slowly eat away at your plaster.
This makes the surface weaker and more prone to cracks.
4. Poor Installation or Workmanship
If your pool was not properly plastered in the first place, cracks can appear much sooner than expected.
Common issues include:
- Improper mixing of materials
- Incorrect application techniques
- Rushed installation
Unfortunately, this often leads to early resurfacing.
5. Ground Movement or Structural Shifting
Arizona soil can shift over time, especially with temperature changes and moisture levels.
This can cause:
- Structural stress
- Larger, more serious cracks
These cracks are typically:
- Longer
- Wider
- Found across multiple areas
These may require more than just resurfacing.
6. Draining Your Pool Incorrectly
Draining a pool without proper precautions can cause pressure imbalances.
This can lead to:
- Surface cracking
- Structural damage
Always work with professionals when draining a pool.
Types of Pool Plaster Cracks
Understanding the type of crack helps determine the solution.
Hairline Cracks
- Thin, shallow
- Usually cosmetic
- Common in aging plaster
Shrinkage Cracks
- Caused during curing or aging
- Typically, not structural
Structural Cracks
- Wider and deeper
- May run across the pool
- Can indicate serious issues
These should always be inspected by a professional.
How to Fix Cracked Pool Plaster
The right fix depends on the severity of the damage.
Minor Cracks
- Spot patching
- Surface repairs
Best for small, isolated issues.
Moderate Damage
- Partial resurfacing
- Bond coat applications
Good when cracks are widespread but not structural.
Severe Cracking
- Full pool resurfacing
- Structural repairs (if needed)
This is often the best long-term solution for older pools.
How to Prevent Pool Plaster Cracking
While some wear is inevitable, you can extend the life of your pool by:
- Maintaining proper water chemistry
- Scheduling regular pool maintenance
- Avoiding DIY draining
- Addressing small cracks early
Prevention is always cheaper than repair.
When Should You Call a Professional?
You should have your pool inspected if:
- Cracks are growing or spreading
- You notice water loss
- The surface feels rough or deteriorating
- Your pool is over 10 years old
Early inspection can prevent costly repairs later.
Get Expert Help with Pool Plaster Cracks
If your pool plaster is cracking, don’t wait until it becomes a bigger (and more expensive) problem.
At We Do It Pools, we specialize in diagnosing and repairing pool surface issues across Phoenix and the East Valley. Whether it’s minor cracking or a full resurfacing, our team will recommend the best solution for your pool.
Contact us today for a free estimate and expert evaluation.