How to Repair a Concrete Fence

A concrete fence is strong and durable, but after years of exposure to weather conditions, damage can occur—such as small cracks, chipped corners, or sinking panels. Fortunately, many repairs can be done yourself.

Types of Damage and Repairs

Type of Damage	Cause	Repair Method
Small cracks/ hairline cracks	Caused by shrinkage, temperature changes, or ground settlement.	Clean and dry the crack, then seal it with an elastic sealant (e.g., paintable acrylic or concrete sealant).
Chipped corners/ impact damage	Impacts, falling objects, or incorrect installation.	Use concrete repair mortar, moisten the surface, press the mortar into the damaged area, and smooth it out.
Efflorescence (white deposits)	Moisture in the concrete carries salts to the surface.	Clean with a diluted acid-based cleaner, rinse thoroughly with water; prevent by coating or impregnating the fence.
Erosion/ peeling paint	Aging, poor paint adhesion, or moisture.	Sand off loose paint and damaged layers, clean and degrease the surface, then apply primer and concrete paint for a long-lasting finish.
Sunken posts or panels	Poor foundation, insufficient depth, or ground settlement.	Remove fence sections, dig out the post, realign it, and reinstall it deeper and more securely in fast-setting concrete.

Concrete Fence Repair Tips

Work in dry weather—moisture is the number one enemy of concrete repairs.
Use materials specifically designed for exterior concrete.
Always clean the surface first; otherwise, repairs won’t adhere properly.
Protect repaired areas after curing with a sealer or coating.