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My stone retaining wall has slumped over time: enter image description here enter image description here

It may be a little hard to detect in pics, but it has sunk about two to three inches in middle :--(

I don't want to tear down and rebuild, nor can I raise area from below, e.g. via mud-jacking. Is there a standard or an accepted way to build up/fill in the slumped area so the slope from left to right is again uniform and straight? Aesthetics are only marginally important...

Polypipe Wrangler
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AA040371
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1 Answers1

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I see that the stone is held in with mortar. As it's not a dry stone wall then you cannot raise it without rebuilding it. With a mortared wall there should be a concrete foundation underneath. If there is no foundation or it has failed due to water run off. Investigate and find out if there is a foundation by digging down.

  • find the foundation
  • if there is a foundation why did it fail? resolve this first
  • if there is no foundation then remove all the stone

Then you have choices such as:

  • remove the existing stone, remove the mortar, rebuild as a dry stone wall on a bed of stone dust
  • or use interlocking concrete retaining bricks. This will require digging to create a bed of six to twelve inches of crushed 5/8 or 7/8 gravel compacted with a top layer of a few inches of stone dust
  • another option could be called the "go big or go home". Large concrete blocks will not move very much and you could get away without a proper base. See here. This will definitely cost more but will last longer
kevinskio
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