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Air temperature 320F to 25'F. <br />(1) Heat sand and mixing water <br />to produce mortar temperatures between �. <br />40°F and 120°F. <br />(2) Maintain temperatures of mortar <br />on boards above freezing. <br />c. <br />Air temperatures 25°F. to 20°F. <br />(1) Heat sand and mixing water <br />to produce mortar temperatures between <br />40°F. and 120°F. <br />(2) Maintain mortar temperatures <br />on boards above freezing. <br />(3) Use salamanders or other <br />heat sources on both sides of walls ,— <br />under construction. <br />(4) Use windbreaks when wind is <br />in excess of 15 mph. <br />d. <br />Air temperature 20°F. and below: <br />(1) Kea' sand and mixing water <br />to produce mortar temperatures between <br />40°F. and 120°F. <br />U.- <br />(2) Provide enclosures and auxiliary <br />heat to maintain air temperature <br />above 32°F. <br />(3) Minimum temperature of units <br />when laid: 20°F. <br />04200.7.4. <br />Protection requirements for <br />completed masonry and masonry not <br />being <br />worked on - <br />a. <br />Mean daily eir temperature 40°F. <br />to 32°F. <br />(1) Protect masonry from rain <br />or snow for 24 hr. by covering with <br />weather —resistive membrane. <br />b. <br />Mean daily air temperature 32°F. <br />to 25°F. <br />(1) Completely cover masonry with weather —resistive membrane for 24 hr. <br />c. <br />Mean daily air temperaturae 25°F <br />to 20'F. � <br />(1) Completely cover masonry <br />with insulating blankets or equal <br />protection for 24 hr. <br />d. <br />Mean daily air temperature 20'F and below: <br />(1) Maintain masonry temperature <br />above 32°F. for 24 hr. <br />04200-4 �. <br />0-9693b <br />a <br />NJ <br />