Concrete Floor Spalling: Causes, Prevention, and Repair

Concrete floor spalling is a common problem that many property owners face. It can be caused by a number of factors, including weathering, poor drainage, inadequate ventilation, and more. Spalling can cause significant damage to your concrete floors, so it’s important to take action to prevent it from happening.

There are a number of ways to prevent concrete floor spalling, including proper drainage and ventilation, sealing the concrete, and more. If you do experience spalling, there are a number of ways to repair it, depending on the extent of the damage.

This article provides an overview of concrete floor spalling, including its causes, prevention, and repair.

What Is Concrete Floor Spalling?

Concrete floor spalling is the process by which concrete breaks down and begins to crack and flake off. Concrete is a mixture of cement, water, sand, gravel, and other materials. It’s a durable material that can withstand a lot of abuse, but it’s not indestructible.

Causes of Concrete Floor Spalling:

  • Weathering:

The most common cause of concrete floor spalling is weathering, which occurs when the surface of the concrete is exposed to moisture and then dries out. This can be caused by many different factors, such as excessive rain or snow, a leaky roof that causes water to collect on the floor, or even condensation from air conditioning units.

  • Poor drainage:

Poor drainage can also cause concrete floors to crack and spall over time. This happens when water pools on top of your concrete floor instead of draining away into pipes below it. 

If you have poor drainage in your yard (e.g., if there are too many puddles), then this can cause water to accumulate on top of your patio or porch overnight during rainstorms or when the snow melts during springtime – causing damage over time!

  • Inadequate ventilation:

Concrete slabs are often exposed to high concentrations of moisture and carbon dioxide when they’re being poured or cured (which is why they’re often referred to as “green” slabs). When this happens for an extended period of time without adequate ventilation (such as through an open window), this can cause the slab’s surface to become weak or even crack apart like a loaf of bread left out in the sun for too long. This is called “blistering” or “slabbing”.

How to Prevent Concrete Floor Spalling:

There are a number of things you can do to prevent concrete floor spalling. The first step is to ensure that your concrete properly drains and ventilates. This will help prevent moisture from building up and causing damage.

If you have an older building, then the plumbing may not be right, or there may be issues with the drainage system. If this is the case, it’s important to get those things fixed before they cause any serious damage. For example, if your basement is flooded with water during a heavy rainstorm, then it could cause significant damage to your floors.

Another thing you should do is seal your concrete flooring with a protective coating like polyurethane or polyacrylic acid (PAA). These coatings protect the surface of the concrete by forming a protective barrier that prevents moisture from reaching it and causing damage. They also help prevent stains and other discolouration caused by oil-based products like oils and waxes.

How to Repair Concrete Floor Spalling:

There are a number of different ways to repair concrete floor spalling. The best method will depend on the extent of the damage and whether you want to stop the spalling from happening again.

One option is to seal the concrete with an epoxy-based coating, which can help prevent water from getting into the concrete in the future.

Another option is to fill in the cracks with epoxy or another type of material like cement mortar or grout.


Knowing what causes concrete floor spalling and how to prevent and repair it will help you maintain your property’s concrete floors.


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