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  • Writer's pictureBear Flag Waterproofing Contractor

A Beginner's Guide to Repairing Spalling Concrete

Introduction to Repairing Spalling Concrete

Concrete is a strong and durable material, but over time, it can develop a common issue known as spalling. Spalling occurs when the surface of the concrete starts to chip, flake, or peel away, leaving unsightly and potentially hazardous areas. Fortunately, repairing spalling concrete is a manageable task that you can tackle with a little guidance. In this beginner's guide, we'll explore the causes behind spalling concrete and provide you with simple, step-by-step methods to restore the beauty and integrity of your concrete surfaces.

spalling concrete repair section
Small spalling concrete section

Section 1: Understanding Spalling Concrete

Before diving into the repair process, it's essential to understand what spalling concrete is and why it happens. Spalling is typically caused by a combination of factors, including:

Freeze-Thaw Cycles: In colder climates, moisture can seep into the concrete. When this moisture freezes, it expands and causes the surface of the concrete to crack and flake.

Chemical Exposure: Exposure to harsh chemicals, such as de-icing salts or acidic substances, can weaken the concrete's surface and lead to spalling.

Poor Construction: If the concrete mixture was improperly mixed, applied, or finished during construction, it can lead to weak spots that are more susceptible to spalling.

Section 2: Safety First

Before starting any repair project, it's crucial to prioritize safety. Make sure you have the following items on hand:

Safety goggles

Dust mask


Protective clothing

Section 3: Materials and Tools You'll Need

To effectively repair spalling concrete, gather the following materials and tools:

Concrete Patching Compound: Choose a high-quality patching compound suitable for your project.

Chisel and Hammer: These will be used to remove loose or damaged concrete.

Wire Brush: Use this to clean the area before applying the patching compound.

Trowel: A trowel will help you apply and smooth out the patching material.

Section 4: Step-by-Step Repair Process

Follow these steps to repair spalling concrete:

Prepare the Area: Begin by cleaning the damaged area with a wire brush to remove loose concrete, dirt, and debris.

Chisel Away Damaged Concrete: Gently chisel the edges of the damaged area to create a clean, even surface for the patching compound.

Mix the Patching Compound: Follow the manufacturer's instructions to mix the patching compound. It should have a consistency similar to peanut butter.

Moisten the Area: Dampen the damaged area with water. This prevents the existing concrete from absorbing moisture from the patching compound too quickly.

Apply the Patching Compound: Use a trowel to apply the patching compound to the damaged area. Smooth it out and ensure it's level with the surrounding concrete.

Finishing Touches: Use the trowel to blend the edges of the patch with the existing concrete. Allow the patch to cure as recommended by the manufacturer.

Section 5: Preventing Future Spalling

After successfully repairing the spalling concrete, take steps to prevent future occurrences:

Apply a concrete sealer to protect the surface from moisture and chemicals.

Regularly clean your concrete surfaces and remove debris to prevent water accumulation.

Avoid using harsh chemicals or de-icing salts on your concrete.

When to Seek Professional Help

While repairing spalling concrete is a manageable DIY project, some cases may require professional assistance. Consider calling in experts if:

The spalling covers a large area or affects structural integrity.

You're unsure about the severity of the damage.

Previous repair attempts have been unsuccessful.


Repairing spalling concrete doesn't need to be a daunting task. With the right materials, tools, and guidance, you can restore the appearance and durability of your concrete surfaces. By understanding the causes of spalling and following the step-by-step repair process outlined in this guide, you'll be well-equipped to tackle this common issue and enjoy long-lasting, beautiful concrete structures.

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