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Chapter 9 Masonry

NCSBC-2104.3 Cold-weather construction. The cold-weather construction provisions of ACI 530.1/ASCE6/TMS 602, Article 1.8C, or the following procedures shall be implemented when either the ambient temperature falls below 40°F (4°C) or the temperature of masonry units is below 40°F (4°C). NCSBC-2104.3.1 Preparation.

  • 1.

    Temperatures of masonry units shall not be less than 20°F (-7°C) when laid in the masonry. Masonry units containing frozen moisture, visible ice or snow on their surface shall not be laid.

  • 2.

    Visible ice and snow shall be removed from the top surface of existing foundations and masonry to receive new construction. These surfaces shall be heated to above freezing, using methods that do not result in damage.

NCSBC-2104.3.2 Construction. The following requirements shall apply to work in progress and shall be based on ambient temperature. NCSBC-2104.3.2.1 Construction requirements for temperatures between 40 °F and 32 °F. The following construction requirements shall be met when the ambient temperature is between 40 °F and 32 °F:

  • 1.

    Glass unit masonry shall not be laid.

  • 2.

    Water and aggregates, used in mortar and grout shall not be heated above 140 °F.

  • 3.

    Mortar sand or mixing water shall be heated to produce mortar temperatures between 40 °F and

120°F at time of mixing. When water and aggregates for grout are below 32 °F, they shall be heated. NCSBC-2104.3.2.2 Construction requirements for temperatures between 32 °F and 25 °F. The requirements of Sections 2104.3.2.1 and the following construction requirements shall be met when the ambient temperature is between 32 °F and 25 °F:

  • 1.

    The mortar temperature shall be maintained above freezing until used in masonry.

  • 2.

    Aggregates and mixing water for grout shall be heated to produce grout temperature between 70 °F

and 120 °F at the time of mixing. Grout temperature shall be maintained above 70 °F at the time of grout placement. NCSBC-2104.3.2.3Construction requirements for temperaturesbetween 25°F (-4°C) and 20°F (- 7°C). The requirements of Sections 2104.3.2.1 and 2104.3.2.2 and the following construction requirements shall be met when the ambient temperature is between 25°F (-4°C) and 20°F (-7°C):

  • 1.

    Masonry surfaces under construction shall be heated to 40°F (4°C).

  • 2.

    Wind breaks or enclosures shall be provided when the wind velocity exceeds 15 miles per hour (mph)

(24 km/h). 3. Prior to grouting, masonry shall be heated to a minimum of 40°F (4°C). NCSBC-2104.3.2.4. Construction requirements for temperatures below 20°F (-7°C). The requirements of Sections 2104.3.2.1, 2104.3.2.2 and 2104.3.2.3 and the following construction requirement shall be met when the ambient temperature is below 20°F (-7°C): Enclosures and auxiliary heat shall be provided to maintain air temperature within the enclosure to above 32°F (0°C). NCSBC-2104.3.3 Protection. The requirements of this section and Sections 2104.3.3.1 through 2104.3.3.4 apply after the masonry is placed and shall be based on anticipated minimum daily temperature for grouted masonry and anticipated mean daily temperature for ungrouted masonry. NCSBC-2104.3.3.1 Glass unit masonry. The temperature of glass unit masonry shall be maintained above 40°F (4°C) for 48 hours after construction. NCSBC-2104.3.3.2 Protection requirements for temperatures between 40°F (4°C) and 25°F (-4°C). When the temperature is between 40°F (4°C) and 25°F (-4°C), newly constructed masonry shall be covered with a weather-resistive membrane for 24 hours after being completed. NCSBC-2104.3.3.3 Protection requirements for temperatures between 25°F(-4°C) and 20°F(-7°C). When the temperature is between 25°F (-4°C) and 20°F (-7°C), newly constructed masonry shall be completely covered with weather-resistive insulating blankets, or equal protection, for 24 hours after being completed. The time period shall be extended to 48 hours for grouted masonry, unless the only cement in the grout is Type III portland cement. NCSBC-2104.3.3.4 Protection requirements for temperatures below 20°F (-7°C). When the temperature is below20°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 Page 39

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