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Lateral pressure causing typical 45 degree stair-step crack in block basement wall.
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Lateral pressure causing vertical
mid-span crack in basement wall.
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Lateral pressure causing top of basement wall to bow inward 9 inches (pilasters failed to brace wall).
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Unconnected downspout and drainage toward house lead to hydrostatic pressure on basement wall.
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Sampling of stiff stratum that underlies many Amherst footings. These soils are expansive and shrink and swell with moisture changes.
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Sump pit with tree roots penetrating into perimeter drain system. This creates potential for uneven moisture under the house.
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Foundation construction illustrating potential for developing uneven moisture conditions during and after house construction.
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Excavation of soft stratum soils in north Amherst. |
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