TM 5-809-3/NAVFAC DM-2.9/AFM 88-3, Chap. 3
for vertical movement in brick walls is
should be similar to brick veneer. Control joint
accomplished with horizontal BEJ*s. The minimum
details will be similar to brick veneer, i.e., both
horizontal joint width will be d inch. This
vertical and horizontal joints will normally be %-
minimum joint width will accommodate movement
inch wide and closure will be with a backer rod and
for most buildings in normal situations. Designers
sealant.
should be aware of building effects, such as, elastic
shortening and creep. These effects may require a
4-5. Composite walls. Where both wythes of the
greater joint width. Recommended horizontal BEJ
composite wall are concrete masonry, the designer
joint locations are:
will apply the prescribed crack control procedures
(1) Under shelf angles and lintels which are
for concrete masonry to each wythe. Where brick
supported by back up wythes.
and concrete masonry units are used together in
(2) At each floor level to multi-story
composite type walls, control joints and expansion
buildings.
joints must extend through the full thickness of the
(3) At points of stress concentration due to
wall wherever either one is required. Brick
vertical movement restraint.
expansion joints also serve the requirements of
d.. Reinforcement. BEJ locations and spacing are
control joints but control joints do not serve as
not adjusted when joint reinforcement is used.
expansion joints.
However, joint reinforcement is recommended as it
will provide greater resistance to cracking due to
4-6. Isolation of nonstructural partitions. When
environmental conditions.
a masonry wall is not a part of the lateral or vertical
e. Joint detailing. Expansion joints are sealed
load resisting system it will be isolated. Isolation
with backer rod and mortar colored sealant. Joints
joints will be provided between the partition and
as small as d inch may be used if architectural
the frame, structural walls, or roof, etc., to prevent
considerations dictate. The joints must be kept
loading the partition.
clear of all material other than the backer rod and
sealant. Foam rubber fillers are not permitted in
4-7. Shelf angles. Masonry walls and veneers in
brick expansion joints.
multistory buildings or in buildings with a large
number of openings are often supported on shelf
4-4. Anchored veneers. Anchored brick and
angles at intervals of one or two story levels. The
concrete masonry unit veneers must be isolated on
shelf angle will be secured against rotation and
against deflections over 1/16-inch. A -inch space
three sides from the back-up wythe. Since the
veneer is isolated from the back-up wythe, concrete
between the ends of shelf angles will be provided to
masonry unit control joints or brick expansion
allow for thermal expansion. Shelf angles will be
joints in the veneer need not aline with the joints in
mitered and made continuous at the corners of the
the back-up wythe.
building.
a. Brick masonry anchored veneer. Joint
spacing and locations and other requirements are as
4-8. Other than running bond masonry. In
described in paragraph 4-3 and table 4-2.
addition to the requirements in the previous para-
b. Concrete masonry anchored veneer. It is rec-
graphs, all walls or wythes placed in other than
ommended that all concrete masonry anchored
running bond will have a minimum area of hori-
veneer contain joint reinforcement at not more than
zontal reinforcement. The minimum reinforcement
16 inches on center. Control joint spacing and
will be 0.0007 times the vertical cross sectional
locations will be according to paragraph 4-2 and
area of the wall. Reinforcement may be placed in
table 4-1, except that control joints at openings
bed joints or in bond beams or both.
4-3
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