Metal Lath > Expansion Control Joints

 

 

Expansion Joints versus Control Joints
Control Joints (CJ) are 1-piece joints designed to relieve stress and minimize cracking; they accommodate initial stucco shrinkage and minor thermal movement. The Control Joints are required to form membrane panels no larger than 100 sq.ft for ceilings and 144 sq. ft. for walls. On the other hand, Expansion Joints are 2-piece joints designed to accommodate a full break through the structure across dissimilar surfaces or to deal with some minor structural movement.

 

AMICO Control Joint (VV or M-Type, #15 Joint)
is designed to provide for movement to accommodate expansion and contraction caused by initial stucco shrinkage and minor thermal movement. Produced in galvanized steel and zinc alloy in 10’ lengths.

Grounds
Galvanized Weight per 1000 Lin. Feet
Zinc Weight per 1000 Lin. Feet
3/8"
225 Lbs.
180 Lbs.
1/2"
235 Lbs.
208 Lbs.
5/8"
273 Lbs.
240 Lbs.
3/4"*
295 Lbs.
254 Lbs.
7/8"
345 Lbs.
295 Lbs.

*Also available in Stainless Steel

 


 

Griplock J Control Joint (#XJ15 Joint)
is similar to the M Control Joint except the J design provides locking of the stucco to the edge of the joint. This design helps reduce stucco separation at the edge of the joint when stucco is forced under the J flange. Produced in 10’ lengths. Griplock J comes pre-taped to ensure a clean joint.

Grounds
Galvanized Weight per 1000 Lin. Feet
Zinc Weight per 1000 Lin. Feet
1/2"
293 Lbs.
254 Lbs.
3/4"
320 Lbs.
265 Lbs.
7/8"
335 Lbs.
277 Lbs.

 

 


 

Inside Corner Control Joint (#30 Joint)
is similar to the standard M Type joint, but the flanges are bent to an angle to form inside
corners, allowing movement. Produced in galvanized steel or zinc alloy in 10’ lengths. Verify availability and lead-time.

Grounds
Galvanized Weight per 1000 Lin. Feet
Zinc Weight per 1000 Lin. Feet
1/2"
235 Lbs.
208 Lbs.
3/4"*
295 Lbs.
254 Lbs.
7/8"
345 Lbs.
295 Lbs.

*Also available in Stainless Steel

 

 

 

M-Slide™ 2-PIECE EXPANSION JOINT
AMICO's M-Slide™ is a new water management accessory that works like the #40 Joint for movement, but improves the flashing and drainage from the area as needed. The M-Slide™ Horizontal combines a weep screed design with a larger, solid flange (on bottom) to provide intermediate flashing/drainage at mid-floor expansion. The M-Slide™ Vertical utilizes larger flanges and a stiffer design to “pre-set” the vertical joint for proper attachment. The 7/8” grounds will work for both 3/4” and 7/8” cladding systems; other size grounds and zinc alloy are available on request. Produced in 10’ lengths. Stocked in AMICO's Birmingham, AL and Fontana, CA facilities.

  • Larger top and bottom flanges for attachment
  • Tight, camber design that provides an opening for a reveal, if needed
  • 25-gauge, G-90 pre-galvanized steel finish
  • Two versions for horizontal and vertical applications
Product #
Grounds
Pieces / Carton
Weight / Carton
Cartons / pallet
Pallet weight
M-Slide H
7/8”
10
110 lbs.
12
1320 lbs.
M-Slide V
7/8”
10
88 lbs.
12
1056 lbs.
 
 
M-Slide™ Horizontal
 
M-Slide™ Vertical

 

 

Zinc Control Joint
Zinc Control Joint has a solid flange with large holes that aid in the attachment of adjoining metal lath. The improved shoulder design allows easier stucco embedment and increases holding capacity at the joint to minimize cracking. Part comes pre-taped to ensure a clean joint. Produced in 10’ lengths.

Product #
Grounds
Pieces/
Carton
Finish
Weight/
Carton
Cartons/
Pallet
CJ380
3/8”
25
Zinc
51 lbs.
20
CJ500
1/2”
25
Zinc
60 lbs.
20
CJ750
3/4”
25
Zinc
66 lbs.
20
CJ1000
1”
25
Zinc
75 lbs.
20

 

 

 

Note: Flashing should be applied in the form of asphalt-saturated construction paper or flashing strips behind all expansion joints and all joints should be imbedded in caulk. AMICO recommends the use of galvanized lath and either zinc alloy or vinyl accessories for all exterior stucco applications. See ASTM C 1063 for installation information.

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