crack in basement wall -- diverting rainwater

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Old 05-30-20, 05:20 PM
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crack in basement wall -- diverting rainwater

Title may be inaccurate. WE noticed horizontal crack several feet long and not very in the drywall next to an exterior/poured foundation wall. There are large yew bushes planted just a couple of feet from the house, with a gravel "ground" cover. Railroad ties are used as a boarder. We have gutters on the house. The image shows it better. (Yeah it looks outdated). We got worried about the crack and had several companies out to access the cause of the damage and how to mitigate it. The advice/estimates ranged from an anchor system to pull the foundation wall out (long threaded bars with anchors spaced along the wall, the anchors would be tightened with nuts periodically to put the wall out) over time, to "just watch it and call me if it gets worse. The 3rd company said that we should remove the gravel and ties and slope the ground it so it grades "nicely" to
the yard.

Removing the ties and regrading would help drainage. Why would he say to also remove the gravel? I can't see how that would affect the drainage / improve rain runoff away from the house. We won't go with the anchor system -- they wanted many many $$$ to do it.

BTW: The crack hasn't changed in the last 9 months.

Thx.
 
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Old 05-30-20, 07:30 PM
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If your gravel is deeper than the soil outside the gravelled area you basically have a trench around the house. Water in that area soaks into the ground instead of running off like a properly graded lot should be. That's probably why he said it.

And with the thick cover there, it never gets sun to dry out. Clay soils are expansive so when wet they exert hydraulic pressure on the wall, pushing it in.
 
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Old 06-01-20, 10:58 AM
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Ok. That makes sense. The gravel was probably put down 35 or more years ago. Iím assuming itís pretty well worked into tge dirt and wonít be fun getting it out. 🙁
 
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