temperature falls below 4 degrees C 40 degrees F or temperature of masonry
units is below 4 degrees C 40 degrees F, a written statement of proposed
cold weather construction procedures shall be submitted for approval. The
following precautions shall be taken during all cold weather erection.
3.1.2.1
Protection
Ice or snow formed on the masonry bed shall be thawed by the application of
heat. Heat shall be applied carefully until the top surface of the masonry
is dry to the touch. Sections of masonry deemed frozen and damaged shall
be removed before continuing construction of those sections.
a.
Air Temperature 4 to 0 degrees C 40 to 32 Degrees F. Sand or
mixing water shall be heated to produce mortar temperatures
between 4 and 49 degrees C 40 and 120 degrees F.
b.
Air Temperature 0 to minus 4 degrees C 32 to 25 Degrees F. Sand
and mixing water shall be heated to produce mortar temperatures
between 4 and 49 degrees C 40 and 120 degrees F. Temperature of
mortar on boards shall be maintained above freezing.
c.
Air Temperature minus 4 to minus 7 degrees C 25 to 20 Degrees F.
Sand and mixing water shall be heated to provide mortar
temperatures between 4 and 49 degrees C 40 and 120 degrees F.
Temperature of mortar on boards shall be maintained above
freezing. Sources of heat shall be used on both sides of walls
under construction. Windbreaks shall be employed when wind is in
excess of 24 km/hour 15 mph.
d.
Air Temperature minus 7 degrees C 20 Degrees F and below. Sand
and mixing water shall be heated to provide mortar temperatures
between 4 and 49 degrees C 40 and 120 degrees F. Enclosure and
auxiliary heat shall be provided to maintain air temperature above
0 degrees C 32 degrees F. Temperature of units when laid shall
not be less than minus 7 degrees C 20 degrees F.
3.1.2.2
Completed Masonry and Masonry Not Being Worked On
a.
Mean daily air temperature 4 to 0 degrees C 40 to 32 degrees F.
Masonry shall be protected from rain or snow for 24 hours by
covering with weather-resistive membrane.
b.
Mean daily air temperature 0 to minus 4 degrees C 32 to 25 degrees
F. Masonry shall be completely covered with weather-resistant
membrane for 24 hours.
c.
Mean Daily Air Temperature minus 4 to minus 7 degrees C 25 to 20
degrees F. Masonry shall be completely covered with insulating
blankets or equally protected for 24 hours.
d.
Mean Daily Temperature minus 7 degrees C 20 degrees F and Below.
Masonry temperature shall be maintained above 0 degrees C 32
degrees F for 24 hours by enclosure and supplementary heat, by
electric heating blankets, infrared heat lamps, or other approved
methods.
3.1.3
Stains
Potect exposed surfaces from mortar and other stains.
When mortar joints
SECTION 04200
Page 38
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