COLD WEATHER PROCEDURES
A. Do not erect masonry when the air temperature is below 32 degrees
Do not use
masonry unit having frost, snow or a temperature less than 32 degrees F. Do not build on concrete or masonry that is below 32 degrees F.
If air temperature is between 32 degrees and 40 degrees F, use heated mortar matelials.
If temperature is even remotely expected to fall below 32 degrees F, in the 48 hours after placing masonry, provide proper heated enclosure to maintain temperature of masonry above 40 degrees F for 48 hours. Enclosure shall be strong enough to resist wind loads.
D. Do not grout any masonry when the air temperature is below 32 degrees F. Do not place grout in walls that are themselves less than 32 degrees F. If air temperature is between 32 degrees and 40 degrees F, use heated grout materials. If air temperature is even remotely expected to fall below 32 degrees F in the 48 hours after grouting, provide proper heated enclosure to maintain temperature of masonry above 40 degrees F for 48 hours. Enclosure shall be strong enough to resist wind loads. Contractor shall have blankets, tents and heaters on site prior to the onset of cold weather.
Build vertical control joints at 30 feet spacing, maximum, unless noted otherwise on the Drawings. Control joints are built-in type. Sawed type will not be accepted. Fill control joints with specified elastic caulking and specified control joint filler in place of mortar. Bearing to non-bearing wall intersections shall also have caulking in place of mortar. Use backing rods where recommended by sealant manufacturer.
POINTING AND CLEANING
Upon completion of masonry work, rake out all defects in joints and point and fill all holes and cracks with fresh mortar, tooled as specified. Clean all mortar daubs from surface. Clean exposed surfaces from top down to remove stains and mortar deposited during construction. Soap and mild cleaning solutions are permitted only after 48 hours after construction of walls. Acid solutions are pelmitted only after 7 days after construction of walls, using one part muliatic acid in 10 parts water. Wet walls before applying solution and protect metal, stone and other work. Scrub a small area at a time with stiff fiber brushes. Immediately rinse surface thoroughly with clean water to avoid etching or staining of masonry.
7 Section 04220