Cleveland Metroparks


The 25-foot-tall wall was designed as a 12-inch-thick conventionally reinforced concrete wall supported on a concrete foundation. A monolithic hayloft floor at approximately mid-height and roof framing are supported by this wall.


WJE conducted an investigation to determine the as-built profile of the wall and its effect on the wall's ability to perform structurally, as intended. A planar survey was performed at all accessible areas of the wall. Where access was limited to one side, WJE applied a nondestructive technique using Impact Echo to determine the thickness of the walls. A pachometer was used to determine the approximate location of the embedded rebar.

Utilizing the planar survey and impact-echo thickness data, WJE plotted the cross-sectional profile of the wall at nine representative locations.

Generally, the wall was plumb within ACI tolerance from the foundation to the hayloft floor. Above the hayloft floor, the wall leaned inward as much as approximately 2 inches but generally maintained design thickness. Concrete cover over rebar was generally consistent with the design intent.

Based on limited but conservative structural calculations, WJE concluded that the out-of-plumb as-built condition of the wall was not structurally significant. Construction continued without unnecessary delay, retrofit, or demolition.