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Engineered brick and concrete masonry shall not be built when the temperature is below 32 degrees Fahrenheit on a rising temperature, or below 40 degrees Fahrenheit on a falling temperature, unless adequate precautions are taken to maintain a minimum temperature of the completed masonry and the ambient air of 40 degrees Fahrenheit for a period 48 hours if Type M or S mortar is used and 72 hours if Type N or O mortar is used. Those periods may be reduced to 24 and 48 hours if high early strength cement is used.
(Prior code § 71-10)