Technical Data, Specifications | Johnston & Rhodes …
COMPRESSIVE STRENGTH (ASTM C170), psi: Dry Parallel, psi = Average of 23,230 psi Wet Parallel, psi = Average of 15,900 psi Dry Perpendicular, psi = Average of 12,770 psi Wet Perpendicular, psi = Average of 11,240 psi ... Backs of Stone: Backs of all pieces may be natural or sawn. Backs of paving may not vary more than 1/2″ in 12″. Backs on ...
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