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#40 Two-Piece Expansion Joint

Two-piece expansion control joint

#40 Expansion Joint 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.

Panels are attached to parallel studs through the expansion joint flanges, enabling the finished surface to expand or contract naturally without cracking. #40 is ideal for joining dissimilar wall types such as wood framing to CMU and at construction joints.  If installed horizontally, assure female portion is on top.

The adjustable expansion opening, or reveal, is 1/4" to 5/8".  Additional weather shields should be installed behind the joint to enhance the weather resistance of this system.  Backer-rod and elastic sealant is often installed to assure water resistance.

The #40 Expansion Joint is also available in zinc for increased corrosion resistance.

Code Approvals & Performance Standards

  • ASTM A653 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
  • ASTM C1063 Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
  • ASTM C1861 Standard Specification for Lathing and Furring Accessories, and Fasteners, for Interior and Exterior Portland Cement-Based Plaster
  • SDS For ASTM A653 Steel Finishing Products For Interior Finishing and Exterior Finishing

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 “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 and it is further recommended that they be filled with backer rod and a highly elastic top quality sealant.

PRoduct submittal SHeets

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Product Code Description
EJ40 #40 Two-Piece Expansion Joint

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