How to Repair a Separation Crack Between a Porch & House

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Porches made of concrete that are connected to a house may develop a separation crack or gap. This occurs because, over time, the house "settles," meaning the foundation slightly moves or settles into the ground. This small shift can break the concrete between the porch and the home. Rather than hire a contractor to fill the separation crack, you can repair it yourself using common masonry tools over the course of a weekend.

Things You'll Need

  • Shop vac
  • Masonry sand
  • Portland cement
  • Wheelbarrow
  • Masonry hoe
  • Garden hose
  • Concrete bonding agent
  • Trowel
  • Vacuum out the gap between the porch and the house with shop vac, leaving no fragments of concrete inside the crack.

  • Combine 3 parts masonry sand with 1 part Portland cement in a wheelbarrow and mix thoroughly with a masonry hoe.

  • Wet the dry sand/cement mixture with a garden hose and continue to mix but do not saturate the dry ingredients. Too much water will turn the mixture into what brick layers call "soup." It should have a mud-like consistency.

  • Open a can of concrete bonding agent and pour it into the separation crack, lining the crack with the liquid bonding agent.

  • Tilt the wheelbarrow up immediately, pouring the wet concrete into the separation crack until it is full. Smooth the wet "mud" with a trowel and let it dry and harden for 24 hours before walking on it.

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References

  • "Masonry Skills"; R.T. Kreh; 2002
  • "Concrete Repair, Rehabilitation and Retrofitting"; Mark G. Alexander; 2008
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