Straight Up Contraction Joint

  • Overview
  • Installation
  • Specifications
  • Request Drawings/Info

The Connolly Straight Up Contraction Joint is a continuous pour solution for contraction joints in slab on ground applications.

The straight profile guarantees that the load is transferred through the dowels only.

Connolly Straight Up Contraction Joints are a roll-formed galvanised steel section to provide a leave-in-place formwork. The profile is fixed in place using the patented peg and wedge system.

Connolly Straight Up Contraction Joint System (SUCJ20030)

The Straight Up Contraction Joint has pre-formed holes which allow it to be used in conjunction with Connolly Universal Dowel Sleeves (UDS). The Universal Dowel Sleeves are installed in the steel section using the patented Connolly twist-fix feature. The preformed holes will accommodate round dowels up to 30mm diameter and square dowels up to 24mm.

The Straight Up Contraction Joint profile is available in 3m lengths for slab thicknesses from 125mm to 200mm. Custom heights, lengths (up to 3m), and dowel configurations are available on request.

The Straight Up Contraction Joint utilises the Key Joint range of permanent and removable capping and rebate moulds.


  • Enables continuous pours
  • 3 different profile heights
  • Twist-fix feature provides alignment of dowels for unhindered slab movement
  • Patented wedge fixing mechanism allows fast and accurate height adjustment
  • Additional stiffening ribs to ensure straighter joints
  • Galvanised coating for corrosion protection
  • Can be used to screed off which makes getting the right level quick and easy
  • Wide range of cappings and rebate moulds available​

Step 1:

If a cap or rebate mould is specified, install the specified capping on the profile. Press on top until profile clicks in.

Step 2:

Position Straight Up Contraction Joint Profile in the desired location and drive in the supplied pegs.

Step 3:

Adjust the Straight Up Contraction Joint to the correct height and secure by tapping in the supplied wedges.

Step 4:

Install dowel in Connolly Universal Dowel Sleeve by pressing all the way to the end of the sleeve.

Step 5:

Install Universal Dowel Sleeve in the Straight Up Contraction Joint profile by pushing UDS through the pre-punched holes in the metal profile and twist sleeve 90 degrees to fix in place.

Step 6:

Place reinforcement and pour concrete to both sides of the joint. Finish concrete surface to the top of the expansion joint.

Step 7 (when used with rebate mould only):

Pull out the top profile and apply a sealant to the manufacturer’s specifications.



DescriptionStraight up Contraction Joint System for 125mm slabStraight up Contraction Joint System for 150mm slabStraight up Contraction Joint System for 200mm slab
Slab thickness [mm]125150200
Profile heights [mm]123142190
Length [m]
Dowel diameter [mm]161624
Dowel length [mm]450450450
No of dowels / centres [mm]7 / 4507 / 4507 / 450

Custom lengths (up to 3m), heights, and dowel configurations available on request.

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