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Concrete masonry units manufactured in accordance with this standard shall conform to two grades as follows:
Units having a weight classification of 85 pcf (1360 kg/m3) or greater, for general use such as in exterior walls below and above grade that may or may not be exposed to moisture penetration or the weather and for interior walls and backup.
Units having a weight classification of less than 85 pcf (1360 kg/m3), for uses limited to above-grade installation in exterior walls with weather-protective coatings and in walls not exposed to the weather.