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Old 05-17-2010, 08:25 PM   #1
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Rock wall on top of 5 feet of fill


I am planning on putting an 18" high rock wall on top of five feet of fill. The fill is 3 inch minus over well drained sandy soil. Should I let the fill sit there through the winter before putting the rock wall on top? The wall is loose laid rocks and I don't want it settling so it isn't straight. This is in the snowy North East. Thanks
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Old 05-17-2010, 10:52 PM   #2
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You can let the fill sit there forever, it is not going to compact by itself. If you compacted the fill when you put it in, typically using a vibratory compacter and 6 inch maximum lifts, you are good to go. If you did not compact the fill, it is going to settle, although if it is 3 inch minus crushed stone it won't settle much. Either way, the wall is only 18 inches tall, you are using loose rock, so I say go for it.
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Old 05-29-2010, 07:58 AM   #3
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I couldn't fine anyone to build a wall on top of uncompacted fill. Putting the wall on top of 8" thick reinforced concrete is less expensive than compacting it. Would that be okay? I don't care if the wall settles, as long as it settles uniformly. I think it will as the thickness of fill is a constant 5 feet along the wall's length. The wall is 75' long. Also, even though it is loose laid stone, the masons want to stick concrete on the inside of it to stiffen it up. Thanks.
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