Repairing a Crack in a Concrete Foundation: Epoxy Vs. Urethane


Cracking is not uncommon in concrete foundations. Many variables are responsible for cracking such as shrinkage, settlement and shortening restraint. Applying epoxy ore urethane products to the cracks in the concrete are methods of repair.


  • Epoxies are available in a range of consistencies from extremely thin to pastelike. Epoxy can be used for the structural repair of concrete. An advantage of epoxy is that its compressive strength is higher than that of concrete. Disadvantages are that epoxy requires several hours to cure and may leak out of the back of a crack.


  • Urethanes used for concrete repair are polyurethanes. These polyurethane are used as foams. Advantages are that the polyurethane will not leak through the back of a crack and can sustain movement in the concrete while remaining sealed. A disadvantage is that polyurethane is not suitable for structural repair.


  • Epoxy is used for structural repair. The longer curing time allows the epoxy to seep through crevices inside the crack. Urethanes are used for sealing and waterproofing. The elasticity provided by the urethane allows shifts in concrete while maintaining the seal.


  • Photo Credit old cracked concrete wall: grunge background image by GoodMood Photo from
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