Abstract
Observations from sidewalk level of 100 buildings throughout the US shows that cracks longer than a few centimeters (inches) are present in 1 to 2% of the stone panels on many buildings and a higher percentage for a few. Although artificial cracks can significantly decrease the strength of a panel, those due to natural geologic processes do not necessarily decrease panel strength. An example is given of a marble panel containing a slickensided crack that is at least as strong as panels of the uncracked marble. Residual stress in building stine may contribute to the creation of cracks. Maximum principal stresses of at least 4 to 5 MPa (600 to 750 psi), 40 to 50% of the C880 strength, were measured on a granite panel.
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