3 minutes but not more than 5 minutes. Measurement of ingredients for
mortar shall be by volume. Measurement of sand shall be accomplished by
the use of a container of known capacity or shovel count based on a
container of known capacity. Water shall be mixed with the dry ingredients
in sufficient amount to provide a workable mixture which will adhere to the
vertical surfaces of the masonry units. Mortar that has stiffened because
of loss of water through evaporation shall be retempered by adding water to
restore the proper consistency and workability. Mortar that has reached
its initial set or that has not been used within [2-1/2] [_____] hours
shall be discarded.
3.10.6
Cutting and Fitting
Wherever possible, full units shall be used in lieu of cut units. Where
cut units are required to accommodate the design, cutting shall be done by
masonry mechanics using power masonry saws. Wet-cut units shall be dried
to the same surface-dry appearances of uncut units before being placed in
the work. Cut edges shall be clean, true and sharp. Openings to
accommodate pipes, conduits, and other accessories shall be neatly formed
so that framing or escutcheons required will completely conceal the cut
edges. Insofar as practicable, all cutting and fitting shall be
accomplished while masonry work is being erected.
3.10.7
Masonry Units
When being laid, masonry units shall have suction sufficient to hold the
mortar and to absorb water from the mortar, but shall be damp enough to
allow the mortar to remain in a plastic state to permit the unit to be
leveled and plumbed immediately after being laid without destroying bond.
Masonry units with frogging shall be laid with the frog side down and
better or face side exposed to view. Masonry units that are cored,
recessed or otherwise deformed may be used in sills or in other areas
except where deformations will be exposed to view.
3.10.8
Mortar Joints
Mortar joint widths shall be uniform and such that the specified widths are
maintained throughout. Joints shall be of thickness equal to the
difference between the actual and nominal dimensions of the masonry units
in either height or length but in no case shall the joints be less than 6
mm 1/4 inch nor more than 13 mm 1/2 inch wide. Joints shall be tooled
slightly concave. Tooling shall be accomplished when mortar is thumbprint
hard and in a manner that will compress and seal the mortar joint and
produce joints of straight and true lines free of tool marks.
3.10.9
Joint Reinforcement
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NOTE: Horizontal joint reinforcement will not
normally be required in brick veneer, except when
stacked bond pattern is used.
If joint reinforcement is not used in brick veneer,
this paragraph will be deleted. Where joint
reinforcement is used, it will be located and the
type and size indicated on the drawings.
**************************************************************************
Unless otherwise shown, joint reinforcement shall be spaced at 400 mm 16
SECTION 04810
Page 25
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