Swimming pool cracks are one of the most common problems homeowners face, but not every crack requires the same repair method. Some cracks are only cosmetic and affect the surface finish, while others indicate serious structural damage that can lead to leaks, soil erosion, and costly repairs. Understanding the difference between surface cracks and structural cracks can help you choose the right repair solution and protect your pool for years to come.

Step 1: Identify the Type of Swimming Pool Crack

Before attempting any pool crack repair, it is important to determine the type of crack you are dealing with.

Surface or Cosmetic Cracks

Surface cracks, often called hairline cracks or crazing, usually appear in the plaster or fiberglass gelcoat. These cracks are generally shallow and do not affect the structural strength of the pool. In most cases, they do not leak water and are mainly an appearance issue.

Although cosmetic cracks may not require immediate repair, they should be monitored regularly. Over time, small cracks can expand due to weather changes, pool movement, or normal aging.

Structural Swimming Pool Cracks

Structural swimming pool cracks extend deeper into the concrete or gunite shell and should never be ignored. These cracks may allow water to escape behind the pool shell, causing soil erosion and foundation movement.

Signs of a structural crack include:

• Continuous water loss
• Wide or growing cracks
• Raised or uneven edges
• Loose tile or coping
• Cracks extending across the floor and walls
• Deck movement around the pool

If you notice any of these warning signs, professional inspection is highly recommended.

Step 2: Repair Minor Surface Cracks

Small cosmetic cracks can often be repaired without draining the entire pool. Many homeowners use underwater repair products designed specifically for swimming pools.

The repair process typically includes:

• Cleaning the crack thoroughly to remove dirt and algae
• Lightly roughening the surface for better adhesion
• Applying a pool-grade epoxy or plaster repair material
• Smoothing the repaired area for an even finish
• Allowing the material to cure according to manufacturer instructions

While these repairs can improve appearance, they should not be considered a permanent solution for structural damage.

Step 3: Professional Swimming Pool Crack Repair

Deep swimming pool cracks require specialized repair methods to restore the structural strength of the pool shell.

Professional contractors often begin by draining the pool and carefully preparing the damaged area. The crack may be widened into a V-shaped groove to ensure proper bonding with repair materials.

Depending on the severity of the damage, structural reinforcement may be installed across the crack to stabilize the concrete and reduce future movement. Waterproof repair compounds are then applied before the interior finish is restored through professional pool resurfacing.

This process creates a stronger and longer-lasting repair compared to simple patching products.

Can Pool Resurfacing Repair Swimming Pool Cracks?

Pool resurfacing is an excellent solution for aging pools with rough finishes, discoloration, and minor surface cracks. However, structural swimming pool cracks should always be repaired before resurfacing begins.

A complete resurfacing project restores the appearance of the pool while providing a smoother, more durable finish that can last for many years with proper maintenance.

When Should You Call a Professional?

While small cosmetic cracks can sometimes be repaired by homeowners, structural pool crack repair should always be handled by experienced professionals.

You should schedule an inspection if:

• Your pool loses water regularly.
• Cracks continue to grow.
• Multiple cracks appear across the surface.
• The pool deck begins shifting.
• Tile becomes loose.
• Rough surfaces and stains continue returning.

Early repairs help prevent larger structural problems and reduce long-term repair costs.