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2104.3.3.4 Protection Requirements for Temperatures Below 20°F (—7°C)
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When the temperature is below 20°F (—7°C), newly constructed masonry shall be maintained at a temperature above 32°F (0°C) for at least 24 hours after being completed by using heated enclosures, electric heating blankets, infrared lamps or other acceptable methods. The time period shall be extended to 48 hours for grouted masonry, unless the only cement in the grout is Type III portland cement.
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NYC Building Code 2008 > 21 Masonry > 2104 Construction > 2104.3 Cold Weather Construction > 2104.3.3 Protection > 2104.3.3.3 Protection Requirements for Temperatures Between 25°F (—4°C) and 20°F (—7°C)
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