Instructions / Assembly
79
CONTROL AND EXPANSION JOINTS
The technical content of this literature is eective 5/31/12 and supersedes all previous information. Pub. No. CD-Full Line 5/12
clarkdietrich.com
METAL LATH & ACCESSORIES
EXPANSION JOINT #40
ClarkDietrich expansion joint #40
is a two-piece slip joint that finishes
butt ends of adjacent panels in wide
or tall walls and ceilings, to allow
for multi-directional movement.
Ideal for joining dissimilar wall
types such as wood framing to
CMU and at construction joints.
Use where excessive horizontal
and vertical movement may
occur. Adjustable expansion
opening or reveal is 1/4" to 5/8".
Product code
Size
Grounds
(in)
Length
(ft)
EJ40
(galvanized)
1/2
103/4
7/8
EZ40
(zinc)
1/2
103/4
7/8
CAUTION: Suggestions for installation precautions when installing two-piece expansion
joints and double casing beads used as double expansion joints—ASTM C1063 requires
that double casing beads used as a movement joint are installed “with a flexible barrier
membrane behind the casing beads.” It is ClarkDietrich’s opinion that all two-piece joints,
whether made from double casing beads or as a manufactured two-piece joint, should
be installed with the flexible peel and stick membrane behind the joint. It is further
recommended that they be filled with backer rod and a highly elastic top-quality sealant.
093 ZINC CONTROL JOINT
ClarkDietrich 093 zinc control
joint is applied between abutting
gypsum panels to relieve stresses
of expansion and contraction of
drywall and veneer plaster systems
in wall expanses over 30,' and ceiling
areas exceeding 2,500 square feet.
It’s installed from door header to
ceiling, from floor to ceiling in long
partition runs, and from wall to
wall in large ceiling areas or in areas
where framing or furring change
direction. For interior or exterior
applications.
Product code
Size
Grounds
(in)
Length
(ft)
ZNCJ 3/32 10
NOTE: Where fire and sound control are prime considerations, an approved seal must be
installed behind the control joint.
ZINC CONTROL JOINTS 38, 50, 75 AND 100
Zinc control joints 38, 50, 75
and 100 are roll-formed from
zinc to resist corrosion in both
interior and exterior applications
with gypsum or Portland cement
plaster. An open slot, 1/4" wide
and 1/2" deep, is protected with
plastic tape that is removed after
plaster and finish are completed.
Perforated short flanges aid keying
and wire attachment to metal
lath or stapling to gypsum lath.
Product code
Size
Grounds
(in)
Length
(ft)
ZCJ3 3/8
10
ZCJ5 1/2
ZCJ7 3/4
ZCJ1 1
CAUTION: Joints and corners are a potential point of water intrusion. ClarkDietrich strongly recommends building paper be placed as flashing behind all joints and
corners. Also, a bead of high-quality caulking should be applied under the joints prior to the attachment of the materials.