control joint keys. If one is preferred over the
other in the design, edit this paragraph accordingly
and provide specific details on the drawings. When
control joint keys are not required, fill head
joints with mortar as detailed.
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Control joints shall be provided as indicated and shall be constructed by
using [mortar to fill the head joint] [special control-joint units] [sash
jamb units with control joint key] [open end stretcher units] in accordance
with the details shown on the drawings. Sash jamb units shall have a 19 by
19 mm 3/4 by 3/4 inch groove near the center at end of each unit. The
vertical mortar joint at control joint locations shall be continuous,
including through all bond beams. This shall be accomplished by utilizing
half blocks in alternating courses on each side of the joint. The control
joint key shall be interrupted in courses containing continuous bond beam
steel. In single wythe exterior masonry walls, the exterior control joints
shall be raked to a depth of 19 mm 3/4 inch; backer rod and sealant shall
be installed in accordance with Section 07920 JOINT SEALANTS. Exposed
interior control joints shall be raked to a depth of 6 mm 1/4 inch.
Concealed control joints shall be flush cut.
3.12
BRICK EXPANSION JOINTS AND CONCRETE MASONRY VENEER JOINTS
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NOTE: Brick expansion joints and concrete masonry
veneer joints will be located and detailed on the
drawings.
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Brick expansion joints and concrete masonry veneer joints shall be provided
and constructed as shown on the drawings. Joints shall be kept free of
mortar and other debris.
3.13
SHELF ANGLES
Shelf angles shall be adjusted as required to keep the masonry level and at
the proper elevation. Shelf angles shall be galvanized. Shelf angles
shall be provided in sections not longer than 3 m 10 feet and installed
with a 6 mm 1/4 inch gap between sections. Shelf angles shall be mitered
and welded at building corners with each angle not shorter than 1.2 m 4 feet,
unless limited by wall configuration.
3.14
LINTELS
3.14.1
Masonry Lintels
Masonry lintels shall be constructed with lintel units filled solid with
grout in all courses and reinforced with a minimum of two No. 4 bars in the
bottom course unless otherwise indicated on the drawings. Lintel
reinforcement shall extend beyond each side of masonry opening 40 bar
diameters or 600 mm 24 inches, whichever is greater. Reinforcing bars
shall be supported in place prior to grouting and shall be located 13 mm
1/2 inch above the bottom inside surface of the lintel unit.
3.14.2
Precast Concrete and Steel Lintels
Precast concrete and steel lintels shall be as shown on the drawings.
Lintels shall be set in a full bed of mortar with faces plumb and true.
SECTION 04200
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